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Natural hatching-induced and management for Pacific herring Clupea pallasii eggs attached to the gill net

그물에 부착한 청어 (Clupea pallasii) 어란의 자연 부화유도 및 관리방안

  • Received : 2015.07.23
  • Accepted : 2015.08.22
  • Published : 2015.08.31

Abstract

Pacific herring Clupea pallasii eggs were attached to the gill net in Korean coastal waters off Busan. To conservation and management the eggs attached to the gill net, we followed the natural hatching in coastal waters from five days after fertilization to the hatching finished, where the temperature was $9^{\circ}C$. The diameter of fertilized eggs was 1.24-1.55 mm (n= 50), and had a segmented pale yellow yolk, no oil globule. Natural hatching had started by 10 days after fertilization. Mass hatching occurred around 11-12 days after fertilization, most of eggs separated from the gill net. Therefore, when the Pacific herring eggs attached in gill net, should be natural hatching-induced in coastal waters during 12-14 days.

Keywords

Pacific herring;Clupea pallasii;Gill net;Eggs;Natural hatching;Busan

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Cited by

  1. Variation of target strength by swimming orientation and size for Pacific herring (Clupea pallasii) at the frequency of 70-kHz vol.53, pp.4, 2017, https://doi.org/10.3796/KSFT.2017.53.4.396

Acknowledgement

Supported by : 국립수산과학원