The Effect of Temperature on Osteochilus melanopleurus, Bleeker 1852 Yolk Utilization

Kelabau fish (Osteochilus melanopleurus) is a freshwater fish that is widely found in Riau rivers, has high economic value and has prospects as a farmed fish. The number of deaths on the endogeneous feeding phase of larvae in kelabau fish maintenance led to low production rates. The aim of the study is to determine the effect of different temperatures on the absorption rate of the yolk of Osteochilus melanopleurus fish eggs. The method used is an experimental method at the laboratories scale using 4 (four) temperature treatments, namely 27, 28, 29 and 30°C and 3 (three) tests using the Complete Randomized Design performed in January-October 2022 at the Fisheries Biology Laboratory, Faculty of Fisheries and Marine Science, Riau. The monitoring parameters carried out are as follows the yolk absorption rate, length growth, and yolk utilization efficiency. The results of the study obtained the fastest egg yolk absorption time was at temperature 30°C (102 hours) with the yolk absorption rate 2.93%, the length growth rate 0.679% and an egg yolk utilization efficiency 23.174%. It can be concluded that different temperatures affect the rate of yolk absorption in the Osteochilus melanopleurus larvae. The more the temperature increases, the metabolism also increases, thereby accelerating the absorption rate of the yolk of Osteochilus melanopleurus eggs.