In this issue:

• Thailand charts aquaculture transformation plan at Bangkok workshop.
• Report of the 3rd High-Level Meeting on Aquaculture Transformation in Asia and the Pacific Region.
• AquaHub Vision Workshop: Setting a direction.
• AquaHub private-sector engagement discussion at Third AQUADAPT Peer Learning Event.
• Veterinary training programme: Fundamentals of farm health management in aquaculture.
• Reported aquatic animal diseases in the Asia-Pacific region during the first and second quarters of 2025.
• PhD scholarships in marine sciences: Shanghai Ocean University PhD Programme 2026.

In this issue:

• Integrating fish farming with ducks and poultry in Meghalaya
• Small indigenous fish species: A source of nutritional security
• A short note on two new instances of aquaculture species and system diversification in Purba Medinipur, West Bengal, India
• Adding knowledge to the seed production process of giant featherback in captivity
• Local knowledge and practices in Asian seabass nursery to grow-out culture in Andhra Pradesh
• NACA Newsletter

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.