Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Enriched Rotifer Feeding Efficiency in the Walleye Pollock Theragra chalcogramma Depends on Larval Fatty Acid Composition

명태(Theragra chalcogramma) 자어의 지방산 조성에 따른 영양강화 로티퍼의 먹이효율

  • 박진철 (어업회사법인 가비(주)) ;
  • 홍우석 (강원도 한해성수산자원센터) ;
  • 서주영 (강원도 한해성수산자원센터) ;
  • 남원식 (어업회사법인 가비(주)) ;
  • 권오남 (어업회사법인 가비(주))
  • Received : 2018.08.22
  • Accepted : 2018.10.06
  • Published : 2018.10.31
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Abstract

The objectives of this study were to confirm the nutritional requirements and improve the survival of the walleye pollock Theragra chalcogramma, a cold seawater fish, by enrichment. We analyzed the fatty acids and amino acids of fertilized pollock eggs before hatching, just-hatched larvae, larvae that had absorbed only the yolk sac, and larvae starved for 2 days after yolk absorption. For the survival improvement experiment, we administered docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and DHA-EPA enrichment. Fatty acid decreased DHA and EPA content. On the $30^{th}$ day, body growth was significantly greater in pollock given the EPA and DHA-EPA treatments (P<0.05). Larval survival at 20 and 30 days after hatching (DAH) was greatest under the DHA-EPA treatment (P<0.05). Survival was significantly lower under the EPA treatment at 10 DAH, but then increased to approach that seen under the EPA-DHA treatment (P<0.05). Therefore, we determined that reduced survival in hatchlings of high-mortality pollack could be improved by controlling EPA and DHA content during enrichment. We conclude that cold seawater fish must be given feed that meets their nutritional needs, which can be accomplished using newly manufactured enrichment products for the larvae of cold seawater fish, such as pollock.

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References

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