Early development and effect of temperature on incubation time haruan, Channa striata

Abstract

Early development and the effect of temperature on incubation time and hatching rate of Haruan (Channa stria/us) was studied. Spawned eggs were spherical, slightly transparent, and buoyancy. The diameters of eggs were 1.08 ±0.06mm (range 1.03-1.15mm). Newly hatched embryos possess a mean length of 5.917 ±0.16 mm. Absorption of yolk completed at two days after hatched. However, exogenous stage was evidence much earlier than the exhaustion of yolk. Schooling behavior was observed since the mix stage (endogenous and exogenous). Larvae showed the frequent surfacing, which was the first sign of aerial breathing.