In this issue:
Access to quality seed has long constrained aquaculture of magur, a high-value indigenous catfish prized across north-eastern India. Wild stocks have declined, yet demand continues to rise. In Nalbari district of Assam, scientists and farmers have created a solution. ICAR-Central Institute of Freshwater Aquaculture worked with local farmers to establish more than 25 magur hatcheries using innovative fibreglass-reinforced plastic designs suited to flood-prone conditions. Farmers received training in captive breeding, hormone-induced spawning, and larval rearing using specialised feeds. Individual farmers now produce 300,000-500,000 fry per season, earning substantial income while supplying seed across multiple districts. The model shows how targeted capacity building, appropriate technology, and farmer-centred interventions can transform indigenous fish seed production from a critical bottleneck into a thriving regional enterprise. Approximately 70 farmers now actively supply magur seed where scarcity once limited aquaculture expansion.
]]>Rearing stinging catfish larvae has long challenged Asian fish farmers, as young catfish naturally prefer live prey over manufactured feeds. A West Bengal farmer has developed a method that produces one million catfish fry monthly using Moina zooplankton, as the sole food source. After training at ICAR-CIFA research station, Mr Imran Molla established 25 large tanks to mass-produce Moina using simple ingredients like waste bread and mustard oil cake. He segregates catfish larvae by age into separate compartments and feeds each group appropriately sized Moina. The larvae thrive on this natural diet, reaching sale size in 30 days with high survival rates. This method requires less water management than manufactured feeds, reduces disease risk, and generates substantial income. The farmer's success demonstrates how combining scientific training with local innovation can solve critical bottlenecks in small-scale aquaculture.
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Asian seabass has emerged as a promising alternative to shrimp farming in coastal Andhra Pradesh. This article documents the complete production cycle practiced by farmers in Krishna, Eluru and West Godavari districts, from wild egg collection to market-ready fish.
The production process spans 14-16 months across multiple phases: two nursery stages transform eggs into fingerlings, a pre-grow-out phase develops juveniles to 100-200 g, and a final grow-out period produces fish weighing 3-4 kg. Farmers rely heavily on live feed, primarily small shrimp and tilapia, with feed conversion ratios around 6:1.
While the species offers advantages such as fast growth and salinity tolerance, farmers face challenges including fluctuating export prices, rising feed costs and disease outbreaks. The lack of species-specific therapeutics further complicates disease management. Most harvested seabass currently reaches export markets through Kolkata and Chennai, though opportunities exist for domestic value-added products.
]]>The giant featherback (Notopterus chitala) - valued as food, sport fish, and natural pest controller in carp ponds - remains under-utilised in Asian aquaculture despite strong market demand. Limited knowledge of seed production has constrained commercial development, whilst wild populations face pressures from overfishing and habitat loss.
Researchers at ICAR-Central Institute of Freshwater Aquaculture have compiled practical knowledge on captive breeding and larval rearing of this air-breathing species. Their findings address key challenges: establishing brood stock, triggering natural spawning using hard substrata, managing sensitive larvae through the critical first weeks, and preventing disease transmission from live feeds.
The techniques described offer farmers a pathway to reliable seed production, potentially easing supply constraints whilst reducing pressure on wild stocks. The work demonstrates how systematic documentation of breeding protocols can unlock aquaculture potential for neglected native species with conservation value.
]]>In Purba Medinipur, India's leading fisheries district, two farmers are exploring new directions in aquaculture. Sri Buddhadeb Maity has established commercial farming of the prized murrel (Channa striatus), achieving growth rates of 250-300g within two months. His neighbour, Sri Uttam Manna, has taken an unconventional approach: cultivating freshwater aquarium fish in brackishwater ponds near the Bay of Bengal.
Manna's method challenges established practice. He has observed fewer disease problems than those typically encountered in freshwater aquarium fish operations, potentially due to the salt content in his ponds helping to control pathogens. Both farmers have developed profitable enterprises whilst sharing their methods with neighbouring producers, encouraging diversification across the region.
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Farmers in West Bengal produce giant freshwater prawn seed in coastal ponds. The article sets out their practices in pond preparation and management, stimulating natural food with simple biological aids, and use of in-pond shelters to support survival. Broodstock come from two sources: local rivers or freshwater grow-out -offering different balances of reliability and handling effort. Seed then moves through harvest, grading, packing and delivery to buyers. With a livelihoods-and-sustainability focus, the model benefits smallholders, lessens river collection pressure and underpins a steadier giant freshwater prawn seed pipeline in eastern India.
]]>This video by Montakan Tamtin, Department of Fisheries, features two presentations from Thailand’s delegation to the 3rd High-Level Meeting on Aquaculture Transformation in Asia and the Pacific Region. The first showcases innovation and nature-based solutions in aquaculture via the IDRC-funded AQUADAPT Project; the second presents Thailand’s pilot initiative for low-carbon shrimp farming under an FAO Technical Cooperation Programme.
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