Hepatic insufficiency in spawning Pacific salmon

Trams, Eberhard G.

doi:10.1007/bf00372160

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…Such a fasting is not the main factor responsible for metablic disorders and degeneration changes in several vital organs, like liver (Trams 1969). McBride (1967), considering fed and unfed sockeye salmon (Oncorhynchus nerka) noticed that, after spawning, the pancreas shows marked degenerative changes comparable to those exhibited in unfed salmon.…”

Section: Reproductive Cycle and Mobilization Of Body Storesmentioning

confidence: 93%

Interaction “nutrition-reproduction” in fish

Luquet

Watanabe

1986

Fish Physiol Biochem

108

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In wild fish, gonad maturation and spawning induce modifications in feeding behaviour and dynamics of body stores which are possibly responsible for metabolic disorders. Conversely, food manipulations can modify reproduction of captive female broodstock. A restricted diet during early stages of the life cycle delays the first maturation age, a quantitatively restricted food supply during the stages of oocyte differentiation reduces the egg number, while a reduction of food levels during the last phases of oogenesis has only a small effect on egg size, composition and hatchability. During the spawning period, salmonid female broodstock seem to be more able to utilize carbohydrates than immature fish, they valorize the energy brought in by fats and have low quantitative requirements for proteins (28%). On the other hand, Red Sea bream broodstock have higher needs for proteins (45%).The incorporation into diet of liposoluble vitamins and essential fatty acids is necessary for normal reproduction, but (n-6) fatty acids seem to play a more important role than in juveniles. Although the effects and physiological role of carotenoids are not yet well known in salmonids, they are necessary for normal development in Red Sea bream. Although little work has been done on the effects of mineral nutrition, special attention must be paid to trace elements, manganese in particular.The major part of this review concerns female broodstock, since very little interest has been devoted to males.

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Section: Reproductive Cycle and Mobilization Of Body Storesmentioning

confidence: 93%

Interaction “nutrition-reproduction” in fish

Luquet

Watanabe

1986

Fish Physiol Biochem

108

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“…Several studies of the biochemical changes in migrating Pacific salmon have been undertaken (Duncan and Tarr 1958;Idler and Tsuyuki 1958;Idler and Clemens 1959;Idler and Bitners 1958, 1960Trams 1969;Patton et al 1970;Gilhousen 1980;Mommsen et al 1980;French et al 1983;Ando et al 1985;Hatano et al 1989), and these provide an understanding of the changes in the major energy reserves (lipid, carbohydrate, and protein) during the course of the migration. Lipids are particularly important during this period both as energy sources for lateral red muscle, the main muscle group involved in prolonged swimming, and for gonad development.…”

Section: Introductionmentioning

confidence: 99%

Plasma nonesterified fatty acid profiles in male and female sockeye salmon, (Oncorhynchus nerka), during the spawning migration

Ballantyne¹,

Mercure²,

Gerrits³

et al. 1996

Can. J. Fish. Aquat. Sci.

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To establish if there are sex-specific differences in the utilization of specific fatty acids in salmon during migration, we monitored plasma nonesterified fatty acids (NEFA) in male and female early-run Stuart sockeye salmon, Oncorhynchus nerka, during their spawning migration in the Fraser River. Total plasma NEFA concentrations declined in both males and females to 60 and 40% of their respective initial levels. Palmitic (C 16:0), oleic (C 18:1), docosahexaenoic (C 22:6n3), and eicosapentaenoic (C 20:5n3) acids consistently represented between 66 and 77% of the total plasma NEFAs throughout the migration. These fatty acids are probably utilized as a source of energy to sustain swimming during the migration. A difference in monoene levels between sexes suggest that females utilized monoenes, particularly oleic acid, for yolk production. Fatty acid concentrations of the n6) series remained constant in both sexes; however, a sudden increase of C 20 polyunsaturate proportions of both the n3 and n6 series was observed at the time of gonadal maturation in both sexes. While plasma NEFAs are important as energy sources for migrating sockeye salmon, there is also a selective utilization of plasma NEFAs for gonadal development and reproduction that is reflected in altered NEFA profiles of male and female fish, respectively. Résumé : Nous avons surveillé la concentration plasmatique d'acides gras non estérifiés (AGNE) chez des saumons rouges, Oncorhynchus nerka, femelles et mâles qui passent dans la rivière Fraser au début de la remonte vers la Stuart pour déterminer si l'utilisation de ces acides gras diffère selon le sexe chez le saumon en migration. Nous avons constaté, tant chez les mâles que chez les femelles, une diminution de la concentration plasmatique des AGNE totaux, les valeurs ayant baissé à 60 et 40% de ce qu'elles étaient initialement. L'acide palmitique (C 16:0), l'acide oléique (C 18:1), l'acide docosahexanoïque (C 22:6n3) et l'acide eicosapentanoïque (C 20:5n3) ont représenté 66 et 77% des AGNE plasmatiques totaux durant toute la migration. Il est probable que ces acides gras fournissent l'énergie nécessaire à la nage soutenue durant la migration. Nous avons observé une différence entre les concentrations de monoènes des deux sexes, ce qui pourrait signifier que les femelles utilisent des monoènes, et plus particulìèrement l'acide oléique, pour la production du vitellus. Les concentrations d'acides gras de la série n6 sont restées constantes chez les deux sexes; toutefois, une brusque augmentation des proportions de polyinsaturés en C 20 des séries n3 et n6 est apparue chez les deux sexes au moment de la maturation des gonades. Les AGNE plasmatiques sont d'importantes sources d'énergie pour le saumon rouge en migration, mais certains sont aussi utilisés pour le développement gonadique et la reproduction, utilisation sélective que traduisent les changements du profil des AGNE observés chez mâles et chez les femelles. [Traduit par la Rédaction]

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Liver triglyceride synthesis failure in post‐spawning salmon

Phleger

1971

Lipids

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The ability of liver of pink salmon, Onchorhychus gorbuscha, to synthesize triglycerides is lost after migration into fresh water and spawning. Triglyceride fatty acids are probably mobilized as cholesterol esters as energy sources in these starving fish. Total lipid decreases; cholesterol remains constant; and relative values of protein and water increase in the liver of the spawned out fish. Both hepatic lipogenesis and cholesterol synthesis decrease. Control values are given for river whitefish.

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Hepatic insufficiency in spawning Pacific salmon

Cited by 7 publications

References 5 publications

Interaction “nutrition-reproduction” in fish

Interaction “nutrition-reproduction” in fish

Plasma nonesterified fatty acid profiles in male and female sockeye salmon, (Oncorhynchus nerka), during the spawning migration

Liver triglyceride synthesis failure in post‐spawning salmon

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