꺽지, Coreoperca herzi의 生活史

Life history of the Korean perch, coreoperca herzi

The life history was described to provide basic information for seedling production of the Korean perch, Coreoperca herzi. They inhabit predominantly rocky bottoms, and are preferentially carnivorous, feeding on small fish, shrimp, etc. The smallest size of sexual maturation was thought to be about 80.0㎜. According to the considerable size differences of eggs in the individual ovaries, it was concluded that they spawns several times within a spawning season of May~June. The ripe eggs were demersal and adhesive, and their diameter were 2.6~2.9㎜ with several oil globule of 0.10~0.64㎜. Morphological changes of the larvae were also investigated. The first cell cleavage occurred 2 hour and 30 min. from fertilization. Artificially fertilized eggs were hatched with about 300 hours incubation at 21.5~22.0℃. The newly hatched larvae were 7.0~7.5㎜ in total length with a single oil globule. The yolk was completely absorbed on the 6th day after hatching when the larvae attained about 9.0㎜ in total length and started feeding with alone or mixed with rotifer(Branchionus plicatilis) and Artemia nauplii.