Chromosome Set Manipulation in Heterobranchus Longifilis for Growth Performance

Abstract

Triploidy was induced in Heterobranchus longifilis by injecting the brooders with ovaprim for 15 hours latency period. The fertilized eggs were subjected to chromosome studies, after giving cold shock treatment at 50C for 40 minutes. Diploid and triploid juveniles raised with mean weight of 32.55g and 42.40g respectively were reared in 2 x 2 x 1.2 m3 outdoor concrete tanks. The treatments were in triplicates and were fed with diets containing 45% crude protein. At juvenile stage to nine months of age, triploid H. longifilis growth was significantly different (p