Conference Mind conferences are accredited with Continuing Professional Development (CPD) and Continuing Education (CE), Continuing Medical Education (CME) credits respectively. This is the best platform of the worldwide Conferences, Symposia, Workshops and Exhibitions, include all major science (Medical, Clinical, Pharma, Life Science), Technology (Robotics, Mechatronics), Business Management and Engineering.
Home / Agenda

Agenda

Full-day Events with Awesome Speakers

Conference Schedule

Day 1 full schedule

September 21, 2021 @ 10:00 - 16:00

Shrimp Farming- Feeding the Right Way

 Manoj. M. Sharma

Manoj. M. Sharma

Shrimp Farmer

Institute of Fisheries Biotechnology, India

India

ABSTRACT

.

Marine National Park and Sanctuary : A Unique Coral Reef ecosystem in Gulf of Kachchh Gujarat

Nidhi Shrivastava

Nidhi Shrivastava

Assistant Professor

The M.S. University of Baroda, India

India

ABSTRACT

.

Marine ecosystems - a boon to the human and conservation of rainforests of the seas

S.S.Kirthiga

S.S.Kirthiga

Post-GraduateScholar

Kerala University Of Fisheries And Ocean Studies

India

ABSTRACT

Oceans are the largest ecosystems of the world.It covers more than half of the Earth and consists of diverse organisms which are more and more beneficial to human communities both directly and indirectly. Among the one is the coral reef ecosystems which is said to be the tropical rainforests of the seas.It is of only less than 0.1% but been serving as the protectors and providers of the Earth as they supports the lives of almost all the living beings including fishes and molluscs. But these now suffers from the greatest threats such as climate change, ocean acidification and also predominantly anthropogenic activities besides microplastics that may destroy and degrade the coral reefs which in turn may lead to the destruction and mortality of the coral dependent creatures.Thus the corals are at an alarming need for conservation.Not only corals but also the entire ocean ecosystems are suffering from the most harmful threats which might result in the reduction of ocean resources.In this presentation, the significance of marine ecosystems along with the responsibility of humans in conserving them, the threats and management of coral reef ecosystems both natural and human responsible conservation methods will be discussed in detail.

Genetics, RAS and net-pen systems; a biosystemic approach towards sustainable aquaculture

Phibi Philip Naduvathu

Phibi Philip Naduvathu

Assistant Professor

India

ABSTRACT

Unsustainable use of natural resources or technologies that overexploits natural resources can ultimately lead to human extinction. Any technology or use of natural resources is sustainable only if there is no associated environmental degradation, social unacceptability and economical unfeasibility and this also holds true for aquaculture. It is crucial that aquaculture achieves more and more sustainability day after day as it is the fastest growing food production sector in the world and thus the key towards global food security. The two major components of aquaculture are the fish (biological) and the system in which it is cultured. The paper discuss the potential, need and impacts of genetic interventions, recirculatory aquaculture system (RAS) and net-pens. Genetic interventions are the biological key to multiply the aquaculture production sustainably. Traditional and marker assisted selective breeding programmes, transgenics and epigenetics in relation to aquaculture are discussed here. RAS is a land-based, indoor and controlled environment used to rear fish. Reduced water usage, enhanced waste management and nutrient recycling are the main characteristics of RAS, making it a perfect technology to rear fish in those area that have water scarcity and non-optimum environmental or water quality parameters. Net-pen culture systems offer the ability to utilise the vast and untapped area of sea or ocean and other large aquatic water bodies and on the other side it raise serious environmental concerns raising the questions of sustainability. Further research, advancements and development in genetics, RAS and net-pens culture system can make aquaculture one of the most sustainable food production in the world.

The application of chenodeoxycholic acid in the low fishmeal diet of shrimp

Shiwei Xie

Shiwei Xie

Associate professor

Guangdong Ocean University, China

China

ABSTRACT

.

Knowing the “Alternative Seafood”

Amod Ashok Salgaonkar

Amod Ashok Salgaonkar

International Food & Sustainability Professional

India

ABSTRACT

GHG emissions are the leading cause of climate change, which poses risks to fisheries & aquaculture sector resulting in leading to bring severe ecological and biological changes in terms of productivity, species abundance, ecosystem stability and pathogens level worldwide. One of the studies in 2019 shows that freshwater aquaculture in the top 21 producing nations is responsible for 1.82% of global methane & 0.34% of global nitrous oxide emissions (Yuan et al.,2019). Alternative seafood comprised of plant-based, fermentation derived & cell-based seafoods which are emerging as new source of food with potential to augment future food supplies. The IPCC report 2021 shown the severe impacts of climate change & alternative seafood may play the key role in reducing carbon emissions and supplement the existing traditional seafood industry in a time to come paving the way to look at it as an important sector to feed the billions of people in next few years. It is however extremely important that country governments, scientific fraternity & business community should understand the need for developing this sector & forming the joint alliances for growing the alternative seafood sector may other way convert in reducing down the existing carbon emissions hence knowing about the sector as early as possible is the need of the hour.

Agri-waste into a potential aqua-feed ingredient: A way forward for sustainable aquaculture

S. Sangavi

S. Sangavi

Assistant Professor

Trichy Centre for Sustainable Aquaculture, India

India

ABSTRACT

Aquaculture is one of the fastest growing and producing cheapest animal protein rich food among the food production sectors. Besides fulfills half of the animal protein requirement to the protein starving world. To meet out this in future, feed remains a significant constraint to the growth of aquaculture. But, excessive use of costly fish meal forms a restriction in the aqua-feed industry, as the use of formulated commercial feed in the aqua-farm accounts for about 50-60% of the total operational cost and so the optimization of the feed cost is the need of the hour. Thus, urged the researchers to develop a cost-effective, nutritious and sustainable aqua-feed from the unconventional feed ingredients. At contemporary, agro-industry by-products derived from the agricultural crops are widely gaining importance and are used as aqua-feed ingredient in the feed formulation. One of these agro- industrial wastes is the palm kernel meal extracted from the oil palm industry which is well established for ruminants as an active feed ingredient. In recent times, due to its nutritional value, low cost and easy availability, it is gaining a great momentum in aquaculture sector as an unconventional aqua-feed ingredient in the tropical countries. Hence, the application of palm kernel meal feeds to the rohu improved the overall growth performance of the fish.

Present Status of Aquaculture Production and Impact of COVID 19 pandemic on aquaculture and fisheries in Bangladesh

Binay Kumar Chakraborty

Binay Kumar Chakraborty

Aquaculturist/Researcher and Consultant

Bangladesh Agricultural University

Bangladesh

ABSTRACT

Bangladesh has an inland water area of about 45,000 km2 and about 710 km long coastal belt. The fisheries sector contributes 3.52% to the national GDP, 26.37% to the agricultural GDP and more than 1.35% to the total export earnings. The total production was 4.552 m.mt fish in 2019-2020. In contrast, inland open water (capture) contributes 28.19%, and inland closed water (culture) contributes 56.76% to total production. This sector contributes significantly to food security by providing safe and quality animal protein; about 60% (62.58 g/day/capita) of animal protein in daily dietary requirement comes from fish. About 12% of the total population is engaged with this sector on a full and part-time basis for their livelihoods. Aquaculture and fisheries sector of country is severely affected by pandemic corona virus (COVID-19). Data and information sources was used a mixed-method including online questionnaire surveys, face-to-face and telephonic interviews and focus group discussions (FGD) during June 2020 to May 2021 and secondary data was collected publication of the Department of Fisheries (DoF) and related non-published grey literature. This study exposes a positive impact on ecosystem and increased fish stock due to stop of industrial influents and decrease fishing pressure but that are not able to bring community benefits as all the fisheries sub-sector aquaculture is affected by the pandemic COVID 19. The demand of spawn production decreased at the rate of 25 to 30% and number nursery practice was also decreased at 22-26%. Finally, 28-34% fish farmer are not continued fish culture practice due to less demand and lower price of fish. All export and import based business is slowdown globally and nationwide lockdown situation imposed the supply chain and the processors in shutdown mode, and processing and exporting of shrimp, crab and exportable other fish item hampered due to pandemic situation. Out of 12%, about 20-25% fisheries people somehow directly or indirectly related with fisheries sector are going to jobless due to pandemic and assets and activities have been mostly negatively affected resulting in a worsened livelihood. So, to overcome the adverse impacts of COVID-19, a long-term policy and action plan is needed to recover aquaculture sector from the pandemic considering enhance production, economic, social and environmental sustainability by the development of biodiversity, healthy ecosystem and safety food.

Probiotic fermentation of agricultural waste is an ecofriendly cost-effective method to enrich fish feed

Keerthi Thalakattil Raghavan

Keerthi Thalakattil Raghavan

Professor

Mahatma Gandhi University, India

India

ABSTRACT

Aquaculture is the fastest-growing food production industry and one of the most economical and profitable areas. It has been documented in many fish feed that gastrointestinal bacteria play an essential role in the overall health of the host organism. There has been increasing interest in the possible use of probiotics in aquaculture. In the present study, a synbiotic feed (combination of probiotic& prebiotic) has been formulating employing solid-state fermentation using a known probiotic Bacillus clausii. Acacia gum act as a prebiotic cum binder and prebiotic-based agricultural waste such as wheat bran, ripen, unripe Banana peel, and Pineapple peels as organic substrate. Soybean meal is added as an additional protein supplement in the fermented feed to normalize the protein content up to 30%. Four different combinations of feeds had formulated, such as Wheat bran alone (Feed A), Wheat bran+ Unripen Banana peel (Feed B), Wheat bran+ Ripen Banana peel (Feed C), Wheat bran + Pineapple peel (Feed D). The current study had analyzed the biological, chemical, and physical properties of the probiotic fermented feed. All of the fermented feed combinations exhibited high viability except feed C. Same result has also been observed after drying the feed at 400C for 2days. All the formulated feeds except feed C show amylase activity while high protease activity had been recorded by feed C. None of the feed combinations were able to produce lipase activity. Standard protocol ofAOAC-2005 analyzed the proximate composition of dried pelleted feed. In all feed combinations, the moisture level is below 50%. Feed D contains high crude protein content, and feed C recorded least. The recorded lipid and ash content were at low concentrations in all four feeds. The carbohydrate content of all fermented feed is above 20% and the highest recorded in feed C. All the feed pellets exhibited high water stability, i.e., above 80%, and feed B showed above 90% stability. Before commercialization, more standardization and in vivo studies need to conduct to prove the efficacy. The study's outcome encourages the development of an eco-friendly value-added product by utilizing agricultural waste in animal feed or fodder feed other than aquaculture feed.

Innovative financing strategies for aquaculture projects

Ramanan Mahadevan

Ramanan Mahadevan

Former Director

Tamil Nadu Dr.J.Jayalalithaa Fisheries University

India

ABSTRACT

The conventional financing of industrial projects as well as business proposals are undergoing several innovations and Aquaculture projects are no exception. However, an analysis of financing of Aquaculture projects in the last decade does not indicate severe disruption as in the case of other industries. This may be due to large number of unorganised entities in this segment and also on account of popular misconceptions. Banks, as per RBI mandate, treat financing aquaculture projects as Priority Sector Lending and provide all incentives as applicable to Agricultural projects. Several industry associations such as FICCI, CII, ASSOCHAM also organise seminars and conferences to highlight the importance of Aquaculture in improving livelihood of masses and also in promoting entrepreneurship. The respective Ministries of State and Central Governments also provide special incentives and subsidies to fisheries projects. Still in respect of Aquaculture enterprises, India remains in second place globally with China far ahead of it both in terms of volume and exports. Since Finance plays a crucial role in promoting aquaculture projects in a big way and contributes significantly to increase in GDP and per capita income with minimum investment, recent path braking developments in this direction are discussed in this paper

Many of the several thousands of aquaculture projects require corporatisation to avail the benefit of liberal and cheap finance available internationally in the form of External Commercial Borrowings, Foreign Currency Convertible Bonds, ADRs, GDRs, Euro Bonds, etc. They need to be educated on the advantages of converting into public limited companies or LLPs so that they can reap the benefits of privatisation, liberalisation and globalisation of Indian economy by accessing global financial markets. Special Aquaculture Zones may be established in large numbers to derive the advantage of zero GST and low cost borrowings. Industrial Clusters also need to be established to derive synergy, marginal and opportunity cost benefits

Several small enterprises have taken advantage of accessing capital in SME platforms in BSE and NSE recently and Aquaculture projects need to take advantage of such large scale funding for achieving economies of scale and for increasing India’s output significantly. There are immense opportunities to form Joint Ventures with companies abroad and access funds through FDI route and also technical and market collaborations. The author of this article was personally and successfully associated in one such JV for a marine food company.

While MUDRA Bank has liberalised availability of finance under Mudra Loans Scheme for aquaculture projects as well, the a ailment  is not significant. This needs to be popularised among the existing beneficiaries and prospective entrepreneurs. Similarly availability of collateral free loans under CGTMSE Scheme needs to be brought to the notice of beneficiaries through seminars etc and workshops organised by all stake holders.

Several schemes for sustainable development of fisheries sector, specifically for inland fisheries and aquaculture have been included under the Pradhan Mantri Matsya Samprada Yojana (PMMMY). Banks including NBFC,SFBS,UCBS are offering cash credit, term loan and other credit facilities at concessional interest rates, as applicable to agricultural credit with no collateral security required upto Rs. 20 million. In addition, several banks have introduced specific schemes for financing aquaculture, e.g. Kisan Matsya (Axis Bank).

Further  procedural guidelines have to be developed to cover a a large number of beneficiaries under Fisheries Infrastructure Development Fund announced by the Govt of India which is available at an interest rate of 6%pa with repayment period not exceeding 12 years. A Compendium of technically feasible and economically viable Project Profiles in aquaculture needs to be published with several projects with an outlay not exceeding Rs 50 lakhs as lack of information on viable and profitable aquaculture projects is cited as main bottleneck.

In sum, Aquaculture projects with very high IRR and immense potential for achieving CAGR of minimum15% annually need to take advantage of new innovative strategies in financingthem to achieve all round development both from domestic and global financial markets to achieve increased fish production  to 22 million metric tons by 2024-25  from 13.75 million metric tons in 2018-19.

Assessing grass species for preparing formulated feed for culturing Macrobrachium rosenbergii

Kakoli Banerjee

Kakoli Banerjee

Assistant Professor & Founding Head

Central University of Odisha

India

ABSTRACT

Present research is an attempt to screen 5 perennial indigenous grass species for their biochemical constituents seasonally for one year. Among them, Cynodon dactylon has shown better result in comparison to other grass species and was hence incorporated as micronutrient in the formulated feed.  Macrobrachium rosenbergii culture was carried out by feeding conventional and formulated feed (prepared from floral species) in tanks and ponds filled with spring water for 180 days during 2018 in the Eastern Ghats region of Koraput district, Odisha, India. Two treatments namely T1 and T2 having four replications each were supplied with commercial feed and formulated feed. Feeds were applied as per the body weight of prawns @ 20% for 1st month, 15% for 2nd month, 10% for 3rd and 4th month, 5% for 5th month and 2% till the end of the experiment. The water temperature, pH, dissolved oxygen, transparency, nitrate, phosphate, silicate, Chlorophyll a of culture tanks and ponds were monitored fortnightly. ANOVA results between all the water parameters for both culture tanks and ponds showed significant variation (p<0.05). The survival rate (77.0±0.89%), daily growth rate (0.233±0.05 gm day-1), specific growth rate (4.657±1.04 % day–1) and condition index (2.638 ±0.05) was found to be highest in prawns fed with formulated feed. The feed conversion ratio varied from 2.03±0.05 to 2.68±0.04. Benefit cost ratio of field culture were 1.46 with yield of 702 kg ha-1 in conventional feed and 1.75 with yield of 950 kg ha-1 in formulated feed respectively. The study proved grass extracts to be efficient micronutrient for prawn feed which can be easily adopted by every aqua culturist of the country for prawn production.

Day 2 full schedule

September 22, 2021 @ 10:00 - 19:00

Application of Bile acid in aquatic animals

Bai Zemin

Bai Zemin

Shandong Longchang

Shandong Longchang Animal Health Product Co.,Ltd

China

ABSTRACT

Bile acid is the main active component of bile, It is a series of sterol substances produced in the process of cholesterol metabolism in animals it has multiple biological activities. In the process of fat metabolism, bile acids play important roles in the three stages of fat emulsification, digestion, and absorption. The main functions are as following, protecting the liver and gallbladder, and hepatopancreas of shrimp, promoting lipid digestion, absorption, and metabolism, and has been wildly applied in aquaculture.

Application of Bile acid in aquatic animals

Bai Zemin

Bai Zemin

Shandong Longchang

Shandong Longchang Animal Health Product Co.,Ltd

China

ABSTRACT

Bile acid is the main active component of bile, It is a series of sterol substances produced in the process of cholesterol metabolism in animals it has multiple biological activities. In the process of fat metabolism, bile acids play important roles in the three stages of fat emulsification, digestion, and absorption. The main functions are as following, protecting the liver and gallbladder, and hepatopancreas of shrimp, promoting lipid digestion, absorption, and metabolism, and has been wildly applied in aquaculture.

Enhancement of quality of cryopreserved fish sperm with addition of herbal antioxidants

Sathiya Kala A.

Sathiya Kala A.

Student

ICAR - Central Institute of Fisheries Education

India

ABSTRACT

Cryopreservation is a magnificant development in biological science by storing cells over long periods of time. Semen cryopreservation ameliorate research in reproductive technology however sperm motility and viability is often affected by changes in cooling, freezing and thawing processes. One among the major cause is production of reactive oxygen species (ROS) that decreases cellular survival and functions. ROS produced leads to oxidative damage and osmotic changes in spermatozoa. Though high level of ROS lead to cellular protein fragmentation, denaturation and aggregation. ROS also oxidize lipid to cause lipid peroxidation. Oxidative stress during freezing-thawing processes decrease sperm motility, membrane functions and viability. Spermatozoa motility is an important parameter for sperm movement and their penetration into the egg. The lack of proportion between ROS (reactive oxygen species) production and degradation cause damage to the sperm membrane and subsequent deterioration of their functional properties. Antioxidants are potential additives, partially or completely inverts freeze-thaw stress-associated deterioration. Aromatic plants and herbs are rich source of natural antioxidant. Those are present in their essential oils and diverse extracts.  They are commonly available, easy to collect and economical. Supplementation of extender with herbal antioxidants could reduce oxidative stress and increases sperm quality.

Tilapia Cage Culture System: Mistakes and Precautions

Rakesh Rahul Jadhav

Rakesh Rahul Jadhav

Assistant Professor

Dr. B.S. Konkan Krishi Vidyapeeth

India

ABSTRACT

.

Aflatoxin B1 toxicity in zebrafish larva (Danio rerio): protective role of Hericium erinaceus

Alessio Filippo Peritore

Alessio Filippo Peritore

Ph.D. student

University of Messina

Italy

ABSTRACT

(1) Background: Aflatoxin B1 (AFB1), a secondary metabolite produced by fungi of the genus As-pergillus, has been found mong various foods also in fish feed. However, the effects of AFB1 on fish development and its associated toxic echanism are still unclear;

 

(2) Methods: In the present study we examined morphological alterations and oxidative ress in zebrafish embryos and larvae after exposure to different AFB1 dosages. Furthermore, we evaluated the tentially pro-tective effect of Hericium erinaceus, one of the most characterized fungal extract, with a focus on the rvous system;

 

(3) Results: Treatment of embryos from 6 hours post fertilization (hpf) with AFB1 at 50 and 100 ng/ml gnificantly increases oxidative stress and induce malformations in six-day post-fertilization (dpf) zebrafish larvae. aluation of lethal and developmental end-points such as hatching, edema, malformations, abnormal heart rate and rvival rate were evaluated after 96 hours of exposure. Hericium inhibited the morphological alterations of the larvae,

well as the increase in oxidative stress and lipid peroxidation;

(4) Conclusion, our study suggested that a natural tract such as Hericium may play a partial role in promoting an-tioxidant defense systems and contrasted lipid roxidation in fish development by counteract-ing the AFB1 toxicity mechanism.

Bottlenecks in the path of achieving sustainability in aquaculture

Atshaya.S

Atshaya.S

Student

Fisheries College and Research Institute

India

ABSTRACT

Aquaculture showed a boom with its increasing trend in recent years. Becoming the sector that gives livelihood and food security worldwide, the responsibility of making it sustainable also gets higher. Fish meal replacement being the major research area, still fish meal and fish oil used in aquaculture feeds and products as protein source, accounted for about one fifth of the world’s wild caught fish production in 2018. The intensification of aquaculture systems for scaling up the profit has also scaled up the disease risks. Even after ensuring profit as well as sustainability, culture practices like organic farming, integrated aquaculture and IMTA are still not taken up in a huge range. Cage culture turned out to be more commercial and profit-oriented leaving sustainability a question. Unregulated use of antibiotics, lack of proper biosecurity, less diversification of farmed species, fossil fuel use and climate change making it more challenging to achieve sustainability. In this context, we need to ascertain sustainability, certification and regulation in real-life practice. FIFO AND FFDO are the indexes to measure sustainability in aquaculture. As a result With the effective use of land and water resources to achieve the balance of yielding profit without compromising the environment is the ultimate goal of sustainability.

Reproductive ecology and domestication of Chrysichthys nigrodigitatus of the Cross River, Nigeria

Daniel Ama-Abasi

Daniel Ama-Abasi

Director

University of Calabar

Nigeria

ABSTRACT

Chrysichthys nigrodigitatus, commonly known as silver catfish, is a prized food fish in Nigeria. In the Cross River system, it occurs all year round with peak in the rainy season, from  April to October. Several studies have reported on some threatening factors to the species’ survival, including overfishing, low genetic diversity and climate change. The proposed method to curb the depletion of the resource is domestication. Studies were conducted to determine the reproductive ecology of the species. Simulation of these factors in the hatchery for possible domestication of the species was carried out. Results show that the species is a freshwater species with salinity range from 0.02-0.06 ppt. Their preponderance was directly correlated with turbidity and indirectly corelated with transparency, showing that they prefer dark and shaded conditions. Rainfall triggered reproductive activities. Spawning occurred within the rainy period in crevices and holes in the rocky substratum of the river bed. We simulated these conditions in the hatchery and fish farm by placing cylindrical pipes as holding receptacles in the ponds. This provided hiding place and shade for them. Spawning inside the receptacles was observed in the month of June through July, coinciding with the phenomenon in the wild. The species is shown to embark on parental care. The male parents carry the brood in their mouths until they were able to fend for themselves.  Thus, understanding the reproductive ecology of Chrysichthys nigrodigitatus in the river, enabled us to develop protocol that assisted in its domestication. This is the first time Chrysichthys nigrodigitatus has been raised in the hatchery and made to spawn in captivity. This method of breeding proves better than the current slaughtering of the males in Clarias gariepinus aquaculture, as both male and female parents live to care for their broodings.  Thus, our work has expanded the aquaculture range in Nigeria and Africa. 

New Policy Directives to Minimize the Environmental Impact of Aquaculture Development

Emmanuel Menyoli Molua

Emmanuel Menyoli Molua

Aqua-Global Solutions

Nigeria

ABSTRACT

Aquaculture developments contribute to food security, employment and environmental sustainability at the local, regional and global level. The importance of aquaculture to humans and to the environment has been well documented by global institutions (FAO, 2020; Cassou, 2018). However, fish farming will not generate any kind of benefit if it is not ecological sustainable. Studies have shown that, aquaculture development can contribute to ecological changes and social consequences such as pollution and public health issues due to water extraction, land use, discharge of effluents, use of drugs and chemical and other aquaculture activities (IMR, 2020). Fish farmers must undertake appropriate measures through environmental assessment and monitoring with the aim to minimize these adverse environmental changes. The Code of Conduct for Responsible Fisheries and the UN General Assembly Resolutions and global guidelines provide new directives to support policy development to minimize the ecological and human impact of aquaculture development which includes the implementation of the Ecosystem Approach (EA), strong private and public sector interaction and more. 

Anti-microbial resistance (AMR) and the use of nonnutritive feed additives against bacterial pathogens in aquaculture

Sophie Fridman

Sophie Fridman

Aquaculture Cons.

Aquaculture Consultancy

UK

ABSTRACT

Aquaculture is currently the fastest growing of the animal food production sectors, however its rapid growth and intensification have resulted in a rise in the numbers of infectious pathogens and an escalation of disease outbreaks of farmed animals. The worldwide over or ill use of antibiotics against bacterial pathogens of farmed fish and crustaceans - either therapeutically or prophylactically - as well as growth promotors, has resulted in the emergence of antibiotic resistant bacterial pathogens. It is widely acknowledged that the rate at which antimicrobial resistance (AMR) is developing and spreading globally far outstrips the rate at which new antimicrobial drugs are being developed, and the consequences of AMR include the failure to successfully treat infections, resulting in production losses and negative consequences for livelihoods and food security. There are a number of alternative strategies to improve aquaculture health and productivity whilst reducing the potential for the spread of antimicrobial resistance, that include the in-feed inclusion of non-nutritive ingredients, such as pro- and pre-biotics, immunostimulants and phytogenic substances, whose scope and function in aquaculture will be discussed.

An Investigation into the Pathogenesis of Blue Catfish Alloherpesvirus in Ictalurid Catfish

Suja Aarattuthodi

Suja Aarattuthodi

Asst Research Prof.

National Warmwater Aquaculture Center, Mississippi State University

United States

ABSTRACT

Intensive aquaculture production systems often encounter infectious viral disease outbreaks causing substantial fish mortalities and associated economic losses. Blue catfish alloherpesvirus (BCAHV) is a strain of Ictalurid herpesvirus 1 (IcHV1) genetically similar (94%) to channel catfish virus (CCV). Limited information on the pathogenesis of this virus combined with its potential to cause damages at the production facilities warranted a detailed study of BCAHV. To determine the host-specificity and potential host range of BCAHV, the virus was inoculated onto various fish cell lines belonging to families Ictaluridae, Cyprinidae, Centrarchidae, and Clariidae. Viral replication and exhibition of cytopathic effects (CPEs) were restricted to cell lines from the family Ictaluridae indicating the host preference of BCAHV. Subsequently, fish challenges were conducted to evaluate intrinsic and extrinsic factors influencing BCAHV infection. Mortality due to BCAHV infection was significantly high in blue catfish and low in channel catfish further specifying the host preference of the virus (Figure 1). Clinical symptoms of BCAHV infection included ascites and exophthalmia. Histopathological alterations of the BCAHV infected fish revealed prominent splenitis with severe erythrophagia. Host susceptibility to BCAHV differed with age and fish at 60 days post hatch were more susceptible. Temperature had a significant role in the activation and pathogenesis of BCAHV. Fish exposed to BCAHV at a sustained high temperature had significantly low mortality suggesting the likelihood of virus inactivation. In another fish challenge simulating crowding, mortality was found to be significantly higher in densely stocked tanks, indicating horizontal transmission is a key element in BCAHV pathogenesis. The heightened pathogenicity of BCAHV towards blue and hybrid catfish as observed in this study points to the potential of this virus to cause significant concern in catfish production.

Phenotypic Characterization of Edwardsiella piscicida Isolates from Catfish Aquaculture

Ashmita Poudel

Ashmita Poudel

Graduate res. asst

Mississippi State University

United States

ABSTRACT

Catfish industry is the largest aquaculture sector in the U. S. comprising nearly 75% of the total finfish production. Hybrid catfish (channel catfish (Ictalurus punctatus) ×  blue catfish (I. furcatus)) is a preferred culture species due to its superior production traits (Figure 1). Edwardsiellosis in catfish caused by the bacteria Edwardsiella piscicida is a major threat causing significant production and economic losses (Figure 2). This pathogen mainly targets the grow-out stages of hybrid catfish, which is concerning as most of the production costs would have been incurred by the producers and fish are ready to be harvested. Studies have shown that food size hybrid catfish are 10 times more susceptible to E. piscicida infections. Multilocus Sequence Analysis (MLSA) using the house keeping genes phoU, gryB and pgi have categorized E. piscicida into five genetic clades. Phenotypic characterization of the genetically distinct E. piscicida isolates will serve as a pivotal step to gain more insights of these relevant bacterial strains. A detailed analysis of their optimal temperature range for growth, salt tolerance, nutrient preferences, motility, aerotolerance etc. have been carried out. In addition, the structural and outer membrane protein profiles of E. piscicida isolates will be valuable while developing effective vaccines against these deleterious bacteria. The phenotypic characterization will be beneficial while developing efficient management strategies as well as for disease diagnosis.     

Phenotypic Characterization of Edwardsiella piscicida Isolates from Catfish Aquaculture

Ashmita Poudel

Ashmita Poudel

Graduate res. asst

Mississippi State University

United States

ABSTRACT

Catfish industry is the largest aquaculture sector in the U. S. comprising nearly 75% of the total finfish production. Hybrid catfish (channel catfish (Ictalurus punctatus) ×  blue catfish (I. furcatus)) is a preferred culture species due to its superior production traits (Figure 1). Edwardsiellosis in catfish caused by the bacteria Edwardsiella piscicida is a major threat causing significant production and economic losses (Figure 2). This pathogen mainly targets the grow-out stages of hybrid catfish, which is concerning as most of the production costs would have been incurred by the producers and fish are ready to be harvested. Studies have shown that food size hybrid catfish are 10 times more susceptible to E. piscicida infections. Multilocus Sequence Analysis (MLSA) using the house keeping genes phoU, gryB and pgi have categorized E. piscicida into five genetic clades. Phenotypic characterization of the genetically distinct E. piscicida isolates will serve as a pivotal step to gain more insights of these relevant bacterial strains. A detailed analysis of their optimal temperature range for growth, salt tolerance, nutrient preferences, motility, aerotolerance etc. have been carried out. In addition, the structural and outer membrane protein profiles of E. piscicida isolates will be valuable while developing effective vaccines against these deleterious bacteria. The phenotypic characterization will be beneficial while developing efficient management strategies as well as for disease diagnosis.     

The Role of Live Feeds in Aquaculture

Louis Landesman

Louis Landesman

Aquaculture Dev. Expert

Aquaculture Development Expert

USA

ABSTRACT

Artificially formulated feeds are preferred by aquaculturists for several reasons.  Artificial Feeds are more convenient to use, less variable in composition, more likely to be Nutritionally complete and often are cheaper since they have lower feed conversion rates Than living feed organisms.  However feed organisms are still being cultured for some species Important in aquaculture since these species will not grow without them.  Bivalve mollusks, lobsters and most marine fish larvae are among those aquaculture species that require living feed organisms. This paper describes various plants and animals used to feed species important in aquaculture, such as diatoms, Artemia, Daphnia, rotifers, yeast, etc. and the animal phyla that require them. Live feed is still indispensable for the production of bivalve mollusks, lobsters, Macrobrachium, and most marine fish larvae.