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- Title
A sensitive period during first feeding for the determination of pigmentation pattern in Atlantic halibut, Hippoglossus hihppoglossus L., juveniles: the role of diet.
- Authors
Groot, S J; Næss, T; Lie, Ø
- Abstract
Abstract Six roups of Atlantic halibut, Hipoglossus hippoglossus L , larvae were offered calanoid copepods at defferent periods from day 11 to 25 after first fedng (1.13–3.20 mm mytone height) in order to establish at which stages normal pigmentation was determined. Artemia nauplii enriched with an oil emulsion were used proor to and after the copepod period. Control prougps were fed on copepods or Artemia nauplii enriched with an oil emulsion were used prior to and afer the copepod period. Control groups were fed on copepods or Artemia only. The Artemia diest intiatied an earlier intake of food and higher intial growth compared to the copepod diet. After 50 days of feeding, the average dry weight of the fish fed on Artemia and copepods were quite similar to the copepod-fed fish, while the Artemia -fed fish were the smallest in size. The lowest frequency of normally pigmented jumeniles was found in the Artemia -fed group (66.4%). while the coppepod gropg showed almost 100% nnormal pigmentation. A significantly higher frequency of pigmentation was found in juveniles given a copepod diet close to the initiation of matmorphosis than those provided with an earlier copepod period of equal duration. A high degree of eye migration was found in all groups, but was lowest in the Artemia -fed group. The initial stagae of eye migration was found to occur at a larger body size in fish given Artemia and copepods, or a copepod diet than in fish fed on Artemia alone. There was no significiant correlation between eye miration and gwoth rates prior to metamorphosis although the largest individuals eshibitied the most complete eye migration. High pigmentation frequencies were obtained in fish with a low 22.6n-3:20:5n-3(DHA:EPA)ratio(<1.0).
- Subjects
HALIBUT fisheries; ARTEMIA; AQUACULTURE
- Publication
Aquaculture Research, 1998, Vol 29, Issue 12, p925
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1046/j.1365-2109.1998.29120925.x