겨울철 사육조건이 양식산 뱀장어 Anguilla japonica의 인위적인 성성숙 유도 및 번식에 미치는 영향
Effects of Rearing Condition during the Winter Period on Artificial Maturation and Reproduction of Cultured Female Eel, Anguilla japonica
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겨울철 사육조건이 양식산 뱀장어 Anguilla japonica의 인위적인 성성숙 유도 및 번식에 미치는 영향을 조사하였다. 봄철 salmon pituitary extracts(SPE)을 이용하여 성성숙 유도 예정인 양식산 암컷 뱀장어 친어를 8주의 겨울철 사육기간 동안, 4개의 사육환경(해수저온, 10℃; 해수고온, 20℃; 담수저온, 10℃; 담수고온, 20℃)에 각각 순치하여 사육하였다. 그 후 각각의 실험구의 뱀장어를 해수 20℃로 이동하여 SPE를 매주 1회 8주 동안 복강 주사하였다. 그 결과, 생식소증량지수(GSI)와 성호르몬(E2)의 농도가 해수 실험구에서 유의적으로 증가하였으며, 특히 해수저온 실험구에서 가장 높은 값을 나타냈었다. 번식률 또한 해수저온 실험구에서 가장 높게 나타났다. 이러한 결과는 겨울철 사육환경이 봄철의 성성숙 유도에 효과적인 것으로 추측되며, 양식산 뱀장어의 성성숙유도와 부화율 향상을 위한 기초자료로 유용할 것으로 사료된다.
Abstract
In the present study, we investigated the effects of rearing condition during the winter period on artificial maturation and reproduction of cultured female eel, Anguilla japonica. The female eel was adapted by combination of environmental conditions (seawater/low temperature, 10℃; seawater/high temperature, 20℃; freshwater/low temperature, 10℃; freshwater/high temperature, 20℃) during 8 weeks of the winter period. Then, the female eel cultivated by different conditions during the winter were transferred to seawater at 20℃ for induction of artificial maturation by salmon pituitary extraction (SPE) injection. The results shown that gonadosomatic index (GSI) and plasma levels of estradiol-17β (E2) were significantly higher in female eel were reared in seawater than in freshwater, and were the highest at eel adapted by seawater/low temperature. Also, reproduction coefficient were higher in seawater/low temperature than in the other groups. These results will provide valuable information for elevation of the artificial maturation and reproduction coefficient in the cultured female eel.
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