Growth performance of tilapia fingerling in cage in ponds managed by Adivasi households: An assessment through length-weight relationship
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This study was conducted to assess the growth performances of cage reared GIFT strain of tilapia (Oreochromis
niloticus) fingerling using length-weight (LW) relationship technique. Along with this, condition factor (K) of fish and
pond water quality parameters were also brought under this study to have broader understanding. For LW
relationship and K, a sample size of 120 fingerlings was made from randomly selected three different cages in a pond
at Tarala village in Kaharole Upazila of Dinajpur District, Bangladesh. The length-weight relationship of tilapia
fingerlings reared in cages managed by Adivasi people was significant. The value of correlation coefficient (r) and the
coefficient of determination (r2
) were 0.97 and 0.94 respectively. This suggests that growth of tilapia from fry to
fingerling was normal in cages. The condition factor of different size group of fish was almost closed to 2, indicating
fish health as satisfactory. All the water quality parameters including temperature, transparency, dissolved oxygen,
ammonia-nitrogen, phosphate-phosphorus, nitrate-nitrogen and pH were within suitable range both in cages and
outside the cage in pond. About 5 phyla and 25 genera of phytoplankton from Bacillariophyceae, Cyanophyceae,
Chlorophyceae, Euglenophyceae and Rhodophyceae groups and one phylum and 5 genera of zooplankton from
Rotifera group were found in cage installed in ponds. These all indicate the growth of tilapia fingerling in cages was
satisfactory which was technically sound for landless adivasi households.