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Author(s): Rato A.
Joaquim S.
Tavares T.G.
Martins Z.E.
Guedes A.C.
Pereira L.F.
Machado J.
Matias A.M.
Gonçalves J.F.M.
Vaz-Pires P.
Magnoni L.J.
Ozório R.O.A.
Matias D.
Title: Viability of dietary substitution of live microalgae with dry Ulva rigida in broodstock conditioning of the Pacific oyster (Crassostrea gigas)
Publisher: Company of Biologists
Issue Date: 2018
Abstract: The current study evaluated the microalgae replacement by dry macroalgae (Ulva rigida) in the reproductive success and biochemical composition of the Pacific oyster (Crassostrea gigas) during broodstock conditioning. Five nutritional regimes were tested: 100% macroalgae (diet 1), 50% macroalgae+50% microalgae (diet 2), 25% macroalgae+75% microalgae (diet 3) and 100% microalgae (diet 4). An unfed group was used as a negative control. The microalgae blend was composed of 33% Isochrysis galbana and 67% diatoms (75% Skeletonema costatum+25% Chaetoceros calcitrans). Gonadal maturation was reflected in the physiological condition of the individuals. All treatments, except diet 1, showed an increase in condition index and were fully matured at the end of the trial, with the best physiological condition observed in oysters fed diet 3 and diet 4. Protein and total lipid content increased during the conditioning period, whereas glycogen content decreased. Oysters conditioned with diet 3 had higher protein and total lipid content and lower glycogen content than the other treatments. In addition, diet 3 showed the highest percentage of viable veliger larvae. The current study demonstrated that it is possible to replace 25% of microalgae with macroalgae in the broodstock conditioning, minimizing the operative cost in bivalve hatcheries. © 2018. Published by The Company of Biologists
Subject: animal experiment
animal tissue
biochemical composition
carbohydrate intake
Chaetoceros calcitrans
controlled study
Crassostrea gigas
fat intake
glycogen analysis
gonad development
Isochrysis galbana
protein content
protein intake
reproductive success
Skeletonema costatum
Ulva rigida
Source: Biology Open, vol. 7(9): bio035923
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
Appears in Collections:CIIMAR - Artigo em Revista Científica Internacional

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