Growth and survival of diploid and triploid bata, Labeo bata (Hamilton, 1822)

Bata (Labeo bata), an indigenous, freshwater minor carp, is a great delicacy in Bangladesh. In its natural fishery, bata contributes significantly to the health and nutritional security of large section fisher communities However, it not popular farmed fish because small size slow growth rate. The induction triploidy, aimed at providing faster larger body size, could be appropriate for L. enhance aquaculture potential. present study, we induced triploidy by applying heat shock on fertilised eggs (that were maintained ambient temperature 26–28°C), 3 5 min post fertilisation durations ranging from 1 2 min. Four different temperatures, namely, 38, 39, 40 41°C, tested as treatments. optimum treatment combination was found 39°C duration, after fertilisation, yielding 100% triploidy. Karyotyping revealed 72 chromosomes triploid (3n), whereas diploid control (2n) had 48 chromosomes. performance hatchlings compared against experimental ponds. After 12 weeks rearing, heavier (p < 0.05) than their counterparts. survival rate triploids also better (69%) that diploids (56%). Overall, results (growth survival) over diploids, indicating farming can viable practice