EFFECT OF STOCKING DENSITY AND AGE AT STOCKING ON GROWTH AND SURVIVAL IN Heterobranchus bidorsalis LARVAE

Kareem Oladeji Kazeem

Abstract


Survival and growth performance of Heterobranchus bidorsalis larvae reared for 28 days at
different stocking densities and ages were monitored in order to determine the optimum stocking density and age at stocking. The study followed factorial experimental design in which H. bidorsalis larvae were stocked at densities 100fry/m3 (T1), 200fry/m3 (T2), 300fry/m3 (T3) and 400fry/m3 (T4). Fry were stocked at day3, day6 and day9 after hatching (A, B, and C respectively.). Growth indices (Mean weight gain, mean total length, average daily growth rate, specific growth rate, performance index, condition factor) and survival rate were obtained for the treatments. The result showed that mean weight gain, mean total length, average daily growth and specific growth rate were stocking density dependent. Mean weight gain ranges from 0.09±0.03-0.411±0.15g. The lowest stocking density (100fry/m3) stocked at day three (T1A) had the highest values of mean weight gain and mean length gain (the best growth performance) while the highest survival was recorded in the fish stocked at 100larvae/m3 in day three and day nine (T1A and T1C). The fish stocked in day three at 100larvae/m3 had the highest performance index but the best and consistent best performance index was observed in fish stocked in day nine. It was concluded that H. bidorsalis fry should be stocked at 100fry/m3 between day three to six after hatching as this will enhance optimum survival and better yield.

Keywords: Stocking density, age at stocking, growth, survival, Heterobranchus bidorsalis, larvae.

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