Comparative Study on Length-Weight Relationship and Condition Factor between Hormone Treated and Non-Treated Tilapia (Oreochromis niloticus)

Abstract

A comparative study on Length-Weight relationships and condition factor of tilapia (Oreochromis niloticus), between hormone non-treated (HNT) and hormone treated HT were carried out for 99 days from 05 May to 12 August 2014 at Sylhet Agricultural University Campus pond using cage culture system. There were two treatments with six replications each. HNT stocked in treatment I and HT stocked in treatment II. Stocking density was same in both the treatments. For sampling purpose length and weight were taken randomly collected 16 individuals from each of the cases at 15 days interval throughout the study period. The length-weight relationships of HT and HNT were found Log W=2.140194+1.196176

Log L and Log W=-2.111263+1.179839 Log L, respectively. The exponential value (b) for HT and HNT were 1.196176 and 1.179839. The growth trends were found to be negative allometric type from the present investigations both in HT and HNT. The coefficient (r 2 ) value found 0.9411 and 0.9294 respectively in HT and HNT. The values of condition factor (K) found to vary from 2.101-2.267, and 1.870-2.263; for HNT and HT respectively and the mean values of the same recorded for HNT and HT were 2.165 and 2.116, respectively. According to the present study it can be concluded that performance of HT and HNT tilapia is almost same within two and half months of culture period.