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Commercial fishing for striped bass (Morone saxatilis) is very limited in Canada, therefore there is potential for pond-based aquaculture to fill the consumer market. One impediment to culture is high overwinter mortality among young-of-the-year (YOY) striped bass. In a culture setting, mortality is restricted to YOY bass transferred to cages in constructed freshwater ponds in November; larger bass (>500 g) typically survive well under the ice. Two trials were completed in consecutive winters (2016-2018) to investigate the effect of body size (range ca. 30-50 g), pre-winter diet, and pond characteristics on overwinter survival in 1m3 cages. Mortality rates varied between ponds and years from 10 to 100 % and was inversely related to body size in some cases but not others. Diet had an insignificant effect on survival. Muscle total lipid and triacylglycerol (TAG) and liver TAG proportions on a wet-weight basis were significantly higher when samples from November and March were compared. Phosphoethanolamine (PE) mass in total muscle phospholipid was higher in striped bass sampled in the winter, but proportions of 18:0 and 22:6n-3 in PE and 18:1n-9 and 22:6n-3 in phosphatidylcholine were lower in March samples. Striped bass appear to rely on other lipid classes or body tissues than those analyzed in this study to survive the winter.
This book clearly identifies nearly 170 families of fishes through the use of high-quality illustrations and includes an accurate account of selected members of that particular fish family, as well as a distribution map and accompanying commentary on classification, distribution, and diversity. Key Features* High-quality illustrations of representatives from each family* Distribution map provided for each family* Commentary for each family
All animals face the possibility of food limitation and ultimately starvation-induced mortality. This book summarizes state of the art of starvation biology from the ecological causes of food limitation to the physiological and evolutionary consequences of prolonged fasting. It is written for an audience with an understanding of general principles in animal physiology, yet offers a level of analysis and interpretation that will engage seasoned scientists. Each chapter is written by active researchers in the field of comparative physiology and draws on the primary literature of starvation both in nature and the laboratory. The chapters are organized among broad taxonomic categories, such as protists, arthropods, fishes, reptiles, birds, and flying, aquatic, and terrestrial mammals including humans; particularly well-studied animal models, e.g. endotherms are further organized by experimental approaches, such as analyses of blood metabolites, stable isotopes, thermobiology, and modeling of body composition.
The importance of free longitudinal passage of river fauna is stressed.
The fundamental purpose of this book is to synthesise the divergent literature on aquatic lipids into a co-ordinated, digestible form. A large part of the book addresses lipid composition and production in freshwater organisms, with chapters on phytoplankton, zooplankton and benthic invertebrates. A common theme throughout the book is the function of lipids in aquatic food webs, with a chapter devoted exclusively to lipids as indicators of health in fish populations. A complementary chapter highlights the role of lipids and essential fatty acids in mariculture. Methodologies to determine the lipid content of aquatic samples and suggestions as to the utility of fatty acids as trophic markers are included, as is one chapter on the role of lipids in the bioaccumulation and bioconcentration of toxicants and another on the relationships between lipids and surface films and foams. The final chapter highlights the similarities and differences between lipids of marine and freshwater origin. Students and researchers in ecology, phycology, aquatic toxicology, physiological ecology and limnology will find this an invaluable guide and reference.