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KMID : 0894520100140020051
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Development & Reproduction
2010 Volume.14 No. 2 p.51 ~ p.58
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The Effect of Water Temperature on Egg Developmental Stages of Largescale Blackfish Girella punctata and Smallscale Blackfish Girella melanichthys
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Oh Bong-Se
Choi Young-Ung
Ku Hag-Dong
Kim Sung-Chul
Jung Min-Min
Park Heung-Sik
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Abstract
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This research investigated that the effect of water temperature on egg developmental stages of largescale blackfish Girella punctata and smallscale blackfish Girella melanichthys. The required times from fertilized embryos to hatching for the G. punctata were 67.8~37.5 hrs from 15 to 21℃, shorter as the water temperature increased. But fertilized embryos were dead after Kuffer"s vesicle appearance stage at 24℃ and morula stage at 27℃. Biological minimum temperature (starting point for embryonic development) of the egg development was estimated to be 7.6℃ in average. In G. melanichthys, fertilized embryos were hatched within 61.2~38.3 hr from 15 to 21℃, the times were shorter as the water temperature increased to hatching, but its were dead on above 24℃. Biological minimum temperature of the egg development was estimated to be 6.5℃ in average. Based upon these results, it is recommended that the range of optimum water temperature for embryonic development of G. punctata and G. melanichthys is 15~21℃.
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KEYWORD
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Girella punctata, Girella melanichthys, Water temperature, Egg development
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