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Abstracto

Some growth parameters, condition factor and survival rate of Heterobranchus bidorsalis fry fed on live food Zooplankton treatments for 16 days

Okunsebor S. A. and Ofojekwu P. C.

Some growth parameters, condition factor and survival rate of Heterobranchus. bidorsalis fry fed on live food zooplankton treatments for 16 days was investigated. Individual fry (50) of 3 old days were placed in a 10-litre plastic bowls in five treatments of 3 replicates for 16 days. Initial average length (cm) and weight (g) of the fry were recorded. The water in the plastic bowls was aerated continuously and ⅓ of the water was changed with freshwater daily. The following feeds were fed as treatments to the fry to satiation in bowls: Artemia shell free, live Brachionus calyciflorus, Daphnia pulex, M. micrura, and live M. micrura & Brachionus calyciflorus. Temperature, pH, dissolved oxygen, total alkalinity and free carbon dioxide of source of water monitored in each of water quality parameter of the various treatments was not significantly different from each other. Results show that all the treatments favour percentage weigh gain, total body length, percentage survival rate and condition factor of H. bidorsalis fry. However, the result of treatment ‘B. calyciflorus & M. micrura mixture’ was significantly (p< 0.05) the highest in percentage weigh gain, percentage survival rate and condition factor. The total body length of H. bidorsalis fry fed on M. micrura and those fed on B. calyciflorus treatment groups were significantly longer in length than other treatment groups. Mixture of M. micrura & Brachionus calyciflorus live for Heterobranchus. bidorsalis fry is highly recommended.