Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Effects of Starvation and Delayed Feeding on Growth and Survival of Pacific Cod Gadus macrocephalus Larvae

대구, Gadus macrocephalus, 자어의 첫 섭식 시 기아와 늦은 먹이 공급이 성장과 생존에 미치는 영향

  • Shin, Min-Gyu (Aquaculture Research Division, National Institute of Fisheries Science) ;
  • Lee, So-Gwang (Fisheries Resources and Research Institute) ;
  • Jeon, Hae-Ryeon (The Marine Bio-Education & Research Center, The Institute of Marine Industry, Gyeongsang National University) ;
  • Joo, Jae-Hyeong (The Marine Bio-Education & Research Center, The Institute of Marine Industry, Gyeongsang National University) ;
  • Gwak, Woo-Seok (The Marine Bio-Education & Research Center, The Institute of Marine Industry, Gyeongsang National University)
  • 신민규 (국립수산과학원 양식관리과) ;
  • 이소광 (경상남도 수산자원연구소) ;
  • 전해련 (경상대학교 해양산업연구소 해양생물교육연구센터) ;
  • 주재형 (경상대학교 해양산업연구소 해양생물교육연구센터) ;
  • 곽우석 (경상대학교 해양산업연구소 해양생물교육연구센터)
  • Received : 2019.02.17
  • Accepted : 2019.03.19
  • Published : 2019.03.31
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Abstract

The present study aimed to investigate the influence of starvation on growth, survival and swimming ability of Pacific cod Gadus macrocephalus larvae. Notochord length, musculature height, body depth, gut height and volume of yolk of reared larvae were measured to determine the growth parameters. A significant difference was observed in all morphometric characteristics before 15 DAH (days after hatching). Body depth and volume of yolk of unfed larvae were significantly smaller than those of fed larvae from 9 DAH (P<0.05). Almost all yolk in fed group was consumed at 11 DAH. Survival and growth of larvae were observed to determine the effect of delayed initial feeding (2 DAH, 3 DAH, 4 DAH, unfed). All larvae in the unfed group died by 15 DAH and the larvae in other experimental groups survived until the end of the experiment to 21 DAH. Survival rate was not significantly different between the 2 DAH group ($17.5{\pm}4.27%$) and the 3 DAH group ($20.5{\pm}1.5%$) at 21 DAH (P>0.05). However, there was a significant difference in survival rate between the 3 DAH group and the 4 DAH group ($11.7{\pm}1.52%$) (P<0.05). There was no significant difference in notochord length among the groups fed from 2 DAH, 3 DAH and 4 DAH at 21 DAH (P>0.05). The swimming ability in fed group gradually increased in both cruising and burst swimming speeds, while those abilities in unfed group gradually decreased after reaching the peak at 6 DAH in both cruise ($18.7{\pm}6.56mm/s$) and burst swimming speed ($43.5{\pm}12.65mm/s$).

이번 연구는 대구 (Gadus macrocephalus) 자어의 첫 섭식 시 기아의 영향을 확인하기 위해 실내 사육 실험하여 성장, 생존, 유영 변화를 관찰하였다. 성장변수를 확인하기 위해 척삭장, 근높이, 체고, 장높이, 난황을 계측하였다. 그 결과 모든 항목에서 부화 후 15일 전에 차이가 유의적이었으며, 체고, 난황에서 부화 후 9일부터 유의적 차이가 관찰되었다 (P<0.05). 급이구의 난황은 부화 후 11일 이후에 소비되었다. 늦은 첫 먹이 공급의 영향을 파악하기 위해 다른 먹이 급여 시간 (2일, 3일, 4일, 무급이)에 따른 자어의 생존과 성장을 관찰하였다. 무급이구의 경우 부화 후 15일에 전량 폐사하였으며 나머지 실험구는 실험종료 시까지 생존하였다. 실험이 종료된 부화 후 21일에 2일 급이구 ($17.50{\pm}4.27%$)와 3일 급이구 ($20.50{\pm}1.50%$) 사이에 차이가 유의하지 않았으나 (P>0.05), 3일과 4일 급이구 ($11.67{\pm}1.52%$) 사이에는 유의한 차이가 확인되었다 (P<0.05). 부화 후 21일째 2일, 3일 그리고 4일 급이구에 있어서 척삭장에 유의적 차이가 없었다 (P>0.05). 유영 능력 변화를 관찰한 결과 급이구는 순항유영속도와 돌진유영속도 모두 점진적으로 증가하였으며, 무급이구는 부화 후 6일에 순항유영속도 ($18.7{\pm}6.56mm/s$)와 돌진유영속도 ($43.5{\pm}12.65mm/s$) 모두 최고 속도에 도달한 뒤 점차 감소하였다.

Keywords

References

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