Nutrition and feeding

In this issue:

Exotic trout fisheries resources and potentialities in Uttarakhand; Scenario of captive production of Clarias magur in India; Strategies to reduce feed cost by improving gut health and nutrient utilisation of fish in aquaculture; Fish pituitary gland collection and supply as a vocation in West Bengal, India; Coral trout Plectropomus leopardus aquaculture research and fingerling production in Indonesia; Smartphone app improving smallholder shrimp farming practices in Bangladesh; NACA Newsletter.

Coral trout Plectropomus leopardus is an emerging exported grouper commodity in Indonesia. The demand for coral trout fingerlings has been increasing and the value of this species is the highest among groupers. However, the rearing of coral trout larvae is notoriously more ‘difficult’ than other groupers. This article describes research on coral trout larval rearing protocols conducted by the Institute for Mariculture Research and Fisheries Extension, which has achieved a survival rate of 12%.

Feed is an important input that involves nearly 60% of the total production cost in commercial aquaculture. Hence, nutritionally balanced and cost-effective diets play a large role in deciding the return from an aquaculture venture. Nutritionists are searching for alternative ingredients and approaches to offset the use of fishmeal in aquaculture feeds. This article discusses strategies to reduce feed cost by promoting gut health and nutrient utlilisation, including: Use of probiotics and prebiotics,  supplementation with exogenous enzymes, essential nutrients and chemoattractants, and use of other feed additives such as acidifiers to improve digestibility and mycotoxin binders.

The Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences and NACA are organising a free online training course on mariculture technologies, to be held from 21-25 September 2020. The programme will cover breeding, disease control and prevention, nutrition and feed research, breeding model construction, farm technology development, engineering, quality, safety and inspection technology for aquatic products. The course is open to government officials, researchers, enterprise managers and technicians from developing countries. The deadline for applications is 19 September 2020.

In this issue:

Potential new species in the Kingdom of Saudi Arabia: Sabaki tilapia (Oreochromis spilurus); Role of fish & fisheries in national nutrition of Pakistan; Success story of first fish farmer in India to be awarded ‘Padma Shri’; Insights into the fishing gear and ichthyofauna of major lentic water bodies of Kashmir Valley; NACA Newsletter.

The fisheries sector of Pakistan comprises over 290,000 square kilometres of marine waters and 8.6 million hectares of inland water resources including the world’s largest irrigation system and favourable climatic conditions for aquaculture development. Despite these promising circumstances Pakistan stands thirty-third in world fisheries production. This article considers the true fish production potential of Pakistan and makes a comparison with other regional countries that produce more despite having less water resources, e.g. Bangladesh. Considering the ground reality and gaps in fisheries statistics collection, assessment and reporting, the possibility that fish production and consumption are under reported is explored.

The digestive tract of all vertebrates including fish is known to harbour a complex microbial ecosystem with a large, diverse and dynamic collection of microorganisms. These microbes become an integral component of the host animal with intimate host-microbe associations. In the following study, we employed both bacterial enumeration and culture independent DNA fingerprinting approach to examine the presence of host-specific gut microbiota in Indian major carps related to their occupancy of distinct ecological niches.

In this issue:

Concept of seed production of Heteropneustes fossilis in farmers' fields in West Bengal, India; Fishing gear and practices in flood waters of Assam; Fisherwomen empowerment: Shedding light on the invisible gender; Integrated multi-trophic aquaculture systems: A solution of sustainability.

Marine aquaculture of high value species such as fish is generally reliant on external food supplies and has a negative impact on water quality, generating high organic and nutrient loadings. Integrated multi-trophic aquaculture offers a solution to reduce environmental impact of farming systems, culturing complimentary species that can recycle nutrients and reduce nutrient pollution while generating additional products for sale. This article looks at species selection and integration of trophic levels in system design.

The use of sludge or ‘tubifex’ worm, Tubifex tubifex, as a live food for juvenile fish has been long practiced in farmers’ fields and it is an important fish food for spawn rearing. The cost of tubifex worm becomes prohibitive in the dry season, when supplies are limited. We conducted trials to test the feasibility of culturing tubifex using a selection of agro-industrial wastes. Net biomass production was highest using rice mill sludge as a food source, over a culture period of 20 days.

In this issue:

Rearing of spotted scat and pearlspot in coastal West Bengal, India; harvesting Eurayle ferox (makhana) from wetland fisheries of Assam; prospects of ornamental fish culture in seasonal water bodies in Assam; production of tubifex, a new dimention in aquaculture in feeding juvenile fish; invasive apple snails in Brunei Darussalam; aquaculture trends and opportunities in Sindh, Pakistan; NACA Newsletter.

BRAQCON 2019 wil cover latest research and development in the broader themes of the conference in the form of special sessions, contributed papers, expert group discussions and brainstorming on issues facing aquaculturists and ecosystem managers in India and around the world. The conference themes include: Brackishwater ecosystems, estuarine biodiversity and conservation; aquaculture production systems; larviculture; fish and shellfish nutrition; environment and climate change; aquatic animal health; socio-economic and livelihood issues; and aquaculture genetics and biotechnology.

Insects form a natural food source for many aquatic animals. This and the presence of chitinase makes insect meals a logical alternative to fish meal in the formulation of aquaculture diets. Insect meals have also been shown to allow for enriching through dietary intake. Of particular interest has been the use of black soldier fly larvae. This article reviews the life history and potential of black soldier fly larval meal to replace fishmeal used in fish diets.

In this issue:

Invasive apple snails (Pomacea spp.) in Vietnam: Short review; A review of fresh water integrated multi-trophic aquaculture: Catching up on the dream of a blue revolution in India; Pre-pupae (larvae) of black soldier fly - a potential alternate protein source for aquaculture feeds; Penaeid shrimp and giant prawn seed collection from Rupnarayan River in Purba Medinipur, West Bengal, India; NACA Newsletter; First training course on culture-based fisheries held in Nha Trang, Vietnam.

A briefing on the context and relevance of culture-based fisheries in rural development.

Video presentation on the rationale for increased fish production and consumption.

In this issue:

Regional network on culture-based fisheries and stock enhancement; trout fisheries in the uplands of Arunachal Pradesh - resources and opportunities; empowering young Indian women through entrepreneurship development - opportunities and constraints; a view on murrel (snakehead) fisheries in India; hybrid catfish Clarias batrachus x Heteropneustes fossilis produced by farmers in West Bengal, India; Backyard fish based pig farming using low-cost feed in Arunachal Pradesh - a success story; NACA Newsletter.

In this issue:

28th NACA Governing Council, Dhaka, Bangladesh; register for the First Regional Training Course on Culture-based Fisheries; 11th Indian Fisheries and Aquaculture Forum, Kochi, 21-24 November; audio recordings for regional feed consultation now available; tilapia lake virus; Proceedings of the International Symposium on Aquatic Animal Health and Epidemiology for Sustainable Asian Aquaculture; ICAR-CIBA launch "Vanami Shrimpapp", a mobile app on Pacific white shrimp (Penaeus vannamei) farming; Pakistan officials train on aquaculture certification.

A regional consultation on aquaculture feed production and use in Asia-Pacific was held from 7-9 March 2017. The consultation reviewed the current situation of aquaculture feed production and use, sourcing of ingredients, policy and research needs. This collection contains audio recordings of the technical presentations made by experts, international organisations, the private sector and governments in the region. The report of the consultation is in press and will be made available for download in due course.

Aquaculture Asia Magazine is an autonomous publication that gives farmers and scientists in developing countries a voice. Stories concern the small-scale aquaculture prevalent in the region and the circumstances of farmers trying to make ends meet in an increasingly globalised world. We accept articles on any aspect of aquaculture and the related processing, marketing, economic, environmental and social issues. An RSS feed is available if you wish to stay informed of new issues.