First experience in the larviculture of cobia, Rachycentron canadum(Linnaeus, 1752) in India

Abstract

Cobia aquaculture has been gaining momentum internationally and has spread to more than 23 countries, half of them in theAsia-Pacific region. Envisaging the prospects of cobia farming in India, broodstock development was initiated and the firstsuccessful induced breeding was achieved in March 2010. Larviculture was experimented in Fibre Reinforced Plastic (FRP)tanks as well as Reinforced Cement Concrete (RCC) tanks and protocols were evolved. Green water technique employingthe microalga, Nannochloropsis oculata was used. The critical stage for the larvae was from 5 to 9 days post-hatch (dph),when cumulative mortality reached around 90%. Enriched rotifers were fed from 3 to 10 dph and enriched Artemia naupliifrom 9 to 18 dph. Weaning with larval inert feed was initiated from 18 dph and grading was carried out once in four days toavoid cannibalism. The study was conducted for 31 days and the final larval survival noted in the FRP and RCC tanks were2 and 1%, respectively. At the end of the experiment, the specific growth rate of larvae in the FRP system was 30.1% of bodyweight per day, while the same in RCC tank was 28.3% of body weight per day. The low survival and specific growth rateof larvae in the RCC tanks could be attributed to the low densities of live feed maintained. The present experience indicatedthat cobia seed production can be successfully practised and by refining the methodology, the survival and growth can beenhanced to achieve commercial level fingerling production.