Lipid class composition of the viviparous yellowtail rockfish over a reproductive cycle
Identifieur interne : 000D77 ( Main/Exploration ); précédent : 000D76; suivant : 000D78Lipid class composition of the viviparous yellowtail rockfish over a reproductive cycle
Auteurs : E. C. Norton [États-Unis] ; R. B. Macfarlane [États-Unis]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 1999-06.
English descriptors
Abstract
Triacylglycerols (TAG) were the dominant lipids in liver tissue of both sexes of the viviparous yellowtail rockfish Sebastes flavidus during the spring and summer when greatest feeding occurred. Significant declines in liver TAG during the winter corresponded to increased concentrations of polar lipids (PL), the main component of cell membranes. Elevated PL in female livers relative to those of males preceded the period of ovarian enlargement and may be attributed to the production of vitellogenin. During late vitellogenesis and gestation, ovaries contained significantly elevated concentrations of PL, TAG, and cholesterol. Since yellowtail rockfish are highly fecund and viviparous, large quantities of ovarian PL are required for proliferation of the cell membranes in developing larval tissues. TAG accumulated in ovaries in lower concentrations than PL and were likely metabolized as the main source of energy during gestation. This pattern of ovarian PL concentrations exceeding those of TAG and the presence of oil globules, may be unique to highly fecund, viviparous teleosts and signify an alternative profile to those previously documented for oviparous species. Testes at maximum IG were only 7% of maximum ovarian size, composed of mainly PL, and lacked a defined lipid dynamic pattern across the reproductive cycle.
Url:
DOI: 10.1111/j.1095-8649.1999.tb02055.x
Affiliations:
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C." last="Norton">E. C. Norton</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>National Marine Fisheries Service, Southwest Fisheries Science Center, Tiburon Laboratory, 3150 Paradise Drive, Tiburon, CA 94920</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Macfarlane, R B" sort="Macfarlane, R B" uniqKey="Macfarlane R" first="R. B." last="Macfarlane">R. B. 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Significant declines in liver TAG during the winter corresponded to increased concentrations of polar lipids (PL), the main component of cell membranes. Elevated PL in female livers relative to those of males preceded the period of ovarian enlargement and may be attributed to the production of vitellogenin. During late vitellogenesis and gestation, ovaries contained significantly elevated concentrations of PL, TAG, and cholesterol. Since yellowtail rockfish are highly fecund and viviparous, large quantities of ovarian PL are required for proliferation of the cell membranes in developing larval tissues. TAG accumulated in ovaries in lower concentrations than PL and were likely metabolized as the main source of energy during gestation. This pattern of ovarian PL concentrations exceeding those of TAG and the presence of oil globules, may be unique to highly fecund, viviparous teleosts and signify an alternative profile to those previously documented for oviparous species. Testes at maximum IG were only 7% of maximum ovarian size, composed of mainly PL, and lacked a defined lipid dynamic pattern across the reproductive cycle.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li></region></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Norton, E C" sort="Norton, E C" uniqKey="Norton E" first="E. C." last="Norton">E. C. Norton</name></region><name sortKey="Macfarlane, R B" sort="Macfarlane, R B" uniqKey="Macfarlane R" first="R. B." last="Macfarlane">R. B. Macfarlane</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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