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- Title
Feeding strategies to achieve correct metamorphosis of Atlantic halibut, Hippoglossus hippoglossus L., using enriched Artemia.
- Authors
Groot, S J; Gara, B; Shields, R J; McEvoy, L
- Abstract
Abstract Atlantic hlibut, Hippoglossus hippoglossus L., larvae were reared under four different Aremia feeding regimes for 40 days from day 20 post firest feeding. Three Artemia enrichments were used: Super Selco™ (SS), AlgaMac 2000 ™ (AM) and a particulate mix of AlgaMac 2000™ with tuna orbital oil (T00/AM). The SS and AM Artemia were tested in three different combinations: (1) a 1:1 ratio continuosly to day 60 (AM/SS); (2) a 1:1 ratio to day 41, then AM only (AM/SS-41); and (3) AM only to day 41, then a 1:1 ratio (AM-41). The fourth treatment comprised T00/AM Artemia, which was fed continuously. At day 60 post first feeding, measurements were nmade of survival and growth rates, postmetaqmorphic characteristics (i.e. eye migration and pigment distribution), and lipid composition. The mean survival rates ranged from 65.1% to 84.5%. Specific growth rates varied from 7.64 to 8.13. The eye migration indices were between 2.3 and 2.6. These parameters did not differ significantly among treatments (P > 0.05) significantly greater proportion of fry (P < 0.05) exhibited ‘perfect metamorphosis’ (correct pigment distribution and complete eye migration) in the AM/SS-41 and AM-41 treatments (59.8 ± 3.03% and 54.6 ± 1.08%, respectively) compared to the AM/SS and T00/AM treatments (35.9 ± 4.02% and 39.9 ± 6.43%, respectively). The fatty acid compositions of livers and eyes varied according to feeding regime, but did not correspond to the metamorphosis characterstics of the fry.
- Subjects
HALIBUT fisheries; AQUACULTURE
- Publication
Aquaculture Research, 1998, Vol 29, Issue 12, p935
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1046/j.1365-2109.1998.29120935.x