Physiological energetics of developing embryos and yolk-sac larvae of Atlantic cod ( Gadus morhua ). II. Lipid metabolism and enthalpy balance
Identifieur interne : 001223 ( Main/Exploration ); précédent : 001222; suivant : 001224Physiological energetics of developing embryos and yolk-sac larvae of Atlantic cod ( Gadus morhua ). II. Lipid metabolism and enthalpy balance
Auteurs : N. Finn [Norvège] ; R. Henderson [Royaume-Uni] ; J. Fyhn [Norvège]Source :
- Marine Biology [ 0025-3162 ] ; 1995-12-01.
Abstract
Abstract: This paper presents quantitative data for the changes in the contents of total lipids, lipid classes and their associated fatty acids, together with the changes in caloric contents of developing eggs and yolk-sac larvae of Atlantic cod (Gadus morhua L.). During development between Day 0 to 28 post fertilisation, 32% of catabolic metabolism was fuelled by lipids. On a mass-specific basis, polar lipids (mainly phosphatidyl choline) contributed 60%, and neutral lipids (mainly triacyl-glycerol) contributed 40% to this catabolic component, with each class supplying similar amounts of fatty acids as fuel. The fatty acids supplied by phosphatidyl choline were catabolised non-selectively (i.e. in proportion to their presence in the egg), with about half of them being polyunsaturated. However, of the fatty acids esterified in triacylglycerol, the larvae showed an apparent oxidation preference for monoenes over polyunsaturates or saturates. Routine rates of oxygen consumption and ammonia production were related to the caloric contents of the eggs and larvae in order to derive an enthalpy balance equation (of the form P=C+R+E) for an Atlantic cod larva during its period of endogenous nutrition. For the interval of Day 0 to 25 post fertilisation (the period of yolk dependence), integration of the physiological and caloric data revealed that Atlantic cod larvae conserved 53% of yolk enthalpy (C) for growth (P), 42% was dissipated due to metabolism (R) while only 5% was lost via excretion (E).
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DOI: 10.1007/BF00363910
Affiliations:
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II. Lipid metabolism and enthalpy balance</title><author><name sortKey="Finn, N" sort="Finn, N" uniqKey="Finn N" first="N." last="Finn">N. Finn</name><affiliation wicri:level="1"><country xml:lang="fr">Norvège</country><wicri:regionArea>Zoological Institute, University of Bergen, Allégt. 41, N-5007, Bergen</wicri:regionArea><wicri:noRegion>Bergen</wicri:noRegion></affiliation></author><author><name sortKey="Henderson, R" sort="Henderson, R" uniqKey="Henderson R" first="R." last="Henderson">R. Henderson</name><affiliation wicri:level="2"><country>Royaume-Uni</country><placeName><region type="country">Écosse</region></placeName><wicri:cityArea>NERU Unit of Aquatic Biochemistry, Dept Biological and Molecular Science, University of Stirling, FK9 4LA, Stirling</wicri:cityArea></affiliation></author><author><name sortKey="Fyhn, J" sort="Fyhn, J" uniqKey="Fyhn J" first="J." last="Fyhn">J. 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During development between Day 0 to 28 post fertilisation, 32% of catabolic metabolism was fuelled by lipids. On a mass-specific basis, polar lipids (mainly phosphatidyl choline) contributed 60%, and neutral lipids (mainly triacyl-glycerol) contributed 40% to this catabolic component, with each class supplying similar amounts of fatty acids as fuel. The fatty acids supplied by phosphatidyl choline were catabolised non-selectively (i.e. in proportion to their presence in the egg), with about half of them being polyunsaturated. However, of the fatty acids esterified in triacylglycerol, the larvae showed an apparent oxidation preference for monoenes over polyunsaturates or saturates. Routine rates of oxygen consumption and ammonia production were related to the caloric contents of the eggs and larvae in order to derive an enthalpy balance equation (of the form P=C+R+E) for an Atlantic cod larva during its period of endogenous nutrition. For the interval of Day 0 to 25 post fertilisation (the period of yolk dependence), integration of the physiological and caloric data revealed that Atlantic cod larvae conserved 53% of yolk enthalpy (C) for growth (P), 42% was dissipated due to metabolism (R) while only 5% was lost via excretion (E).</div></front></TEI><affiliations><list><country><li>Norvège</li><li>Royaume-Uni</li></country><region><li>Écosse</li></region></list><tree><country name="Norvège"><noRegion><name sortKey="Finn, N" sort="Finn, N" uniqKey="Finn N" first="N." last="Finn">N. Finn</name></noRegion><name sortKey="Fyhn, J" sort="Fyhn, J" uniqKey="Fyhn J" first="J." last="Fyhn">J. Fyhn</name></country><country name="Royaume-Uni"><region name="Écosse"><name sortKey="Henderson, R" sort="Henderson, R" uniqKey="Henderson R" first="R." last="Henderson">R. Henderson</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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