Ảnh hưởng của độ cứng nước lên một số chỉ tiêu sinh sản của cá rô đồng (<i>Anabas testudineus</i> Bloch, 1792)

Abstract

This study was conducted in order to determine the effect of water hardness on the fertilized rate, hatched rate, survival rate, and deformed rate of climbing perch eggs and larvae. The experiment on the incubation of climbing perch eggs from fertilized eggs to larval fish was carried out with different water hardness tests, including 70, 100, 130, 160, and 190 mg CaCO₃/L with with stocking density of 300 eggs/L. The experimental results showed that the eggs had a similarly fertilized rate in all treatments (83.7-85.3%). The hatched rate ranged from 87.7 to 90.0% and the larval stage had the highest survival rate of 73.7 % at 70 mg CaCO₃/L. The deformed rate of larvae ranged from 3.67 to 10.7% with the lowest in the 70 mg CaCO₃/L. From the results of the study, it can be assumed that climbing perch eggs should be incubated in an aquatic environment with a water hardness of 70-190 CaCO₃/L, and the best water hardness is 70 CaCO₃/L. 

Keywords: climbing perch, Anabas testudineus, water hardness, survival rate