한국수산과학회

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kfas, vol. 54, no. 6, pp.948-953, December, 2021
DOI. https://doi.org/10.5657/KFAS.2021.0948

Effects of Rearing Water Temperature on Hatching Pattern and Larval
Malformation of Walleye Pollock Theragra chalcogramma Fertilized
Eggs and Larvae
수온에 따른 명태(Theragra chalcogramma) 수정란의 부화 패턴과 부화
자어의 기형 발생에 미치는 영향

권오남·홍우석1·박진철1*
어업회사법인 ㈜가비, 1강원도 한해성수산자원센터

To find the optimal eggs to larvae transforming temperature of walleye pollock Theragra chalcogramma, we investigated
their hatching pattern, mortality, and larval deformities. Results showed that the hatching quality decreased
as the water temperature increased and dropped sharply above 13°C. The highest hatching rate was achieved at 7°C,
whereas the lowest was at 15°C. Dead eggs were not observed at 7°C; however, dead egg ratios were significantly
high at 4.5°C and above 13°C (P<0.05). Mortality of larvae after hatching was not observed at 4.5°C, but was significantly
high above 13°C. The DNA content of the larvae did not show any significant difference at all water temperatures;
however, RNA content was the highest at 7°C and was significantly low above 11°C. In addition, RNA/DNA
ratio was the highest at 7°C. Larval deformities after hatching were low at 7-11°C and higher at higher or lower water
temperature. Therefore, the hatching index and larval health index of Walleye pollock eggs in this study show that
7°C to 11°C seems to be the optimal transforming water temperature range.

Keyword : Walleye pollock, Temperature, Hatching pattern, Malformation

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