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The role of osmoregulation and nutrition as determinants of buoyancy and short-term mortality of marine fish larvae /Sclafani, Matthew. January 2000 (has links)
The buoyancy (or density = mass volume-1) of marine larval fish is influenced by their nutritional status, starved larvae being less dense than fed larvae of like age. Buoyancy has, therefore, been proposed as an indicator by which to assess the nutritional condition of marine fish larvae in experiments and in situ. It has also been hypothesized that larval fish experiencing advanced starvation will exhibit increased density due to water loss resulting from osmoregulatory breach and failure. The magnitude of osmoregulation-related changes in density has not been examined and its influence on interpretations of nutritional condition and vertical distributions are unknown. Through a series of controlled laboratory experiments performed on larvae of cod (Gadus morhua L.), I developed evidence that osmoregulatory breach and failure has a strong positive effect on the density of larval fish, and that this effect on density is not limited to larvae experiencing advanced stages of starvation. These effects of osmotic breach and failure are sufficient to obscure effects resulting exclusively from nutritionally caused changes in density. Hence, if not identified and controlled these osmotically driven density changes can bias parameterization of buoyancy-related condition indices. I developed methods for isolating nutritional and osmotic effects. This facilitated the calibration of a nutritionally based density index with which to evaluate the nutritional state of cod larvae. Comparison of the calibrated density assay with a suite of widely used indices of condition (morphometric, behavioural and biochemical) showed density to be superior in its capacity to correctly classify larvae with respect to their nutritional state. The density index was also less subject to bias resulting from uncontrolled changes in larval size. A linear regression model based on these findings was developed to assess the relationship between density as an index of condition and near-term larval
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Étude comparative de la condition et de l'état reproducteur de morues (Gadus morhua) du Fjord du Saguenay et du Golfe Saint-Laurent /Richard, François, January 1997 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 1997. / Document électronique également accessible en format PDF. CaQCU
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Seasonal trends in spawning condition and catch rates of Atlantic cod (Gadus morhua) in northern Placentia Bay, Newfoundland, over 1995-1999 /Bolon, Aline D. P., January 1999 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 1999. / Bibliography: leaves 135-141.
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A study of northern Atlantic cod (Gadus morhua) of eastern Newfoundland and Labrador as a metapopulation /Smedbol, R. Kent, January 1999 (has links)
Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. / Bibliography: leaves 109-119.
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Marine reserves for the northern codGuénette, Sylvie. January 2000 (has links) (PDF)
Thesis (Ph. D.)--University of British Columbia, 2000. / Includes bibliographical references (leaves 93-103).
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Predation-risk in juvenile Atlantic cod with respect to eelgrass patch characteristics in Newman Sound, Bonavista Bay, Newfoundland /Gorman, Ann Marie, January 2004 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2004. / Bibliography: leaves 74-85.
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The role of osmoregulation and nutrition as determinants of buoyancy and short-term mortality of marine fish larvae /Sclafani, Matthew. January 2000 (has links)
No description available.
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Biology of a resident cod (Gadus morhua) population in Gilbert Bay, Labrador /Morris, Corey John, January 2000 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. / Bibliography: leaves 88-95.
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Environmental quality assessment of Georges Bank for Atlantic cod (Gadus morhua)Sellers, Ana M. January 2003 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: Georges Bank; Atlantic cod; environmental quality. Includes bibliographical references (p. 38-42).
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Lipid class and fatty acid composition of plankton and settling particles at a fish enclosure, and of cod (Gadus morhua) in Gilbert Bay, Labrador /Van Biesen, Geert, January 2003 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2004. / Bibliography: leaves 125-135.
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