An integrated study of dietary lipid manipulation and thermal-refuge technology for overwintering red drum (Sciaenops ocellatus) in outdoor ponds /
'C or greater than open-pond temperatures. Fish were
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 'C or greater than open-pond temperatures. Fish were (100 g) red drum (Sciaenops ocellatus). After 6 weeks of 0.04-ha earthen ponds, with or without thermal refuges, A commercial diet containing 10% lipid and an experimental affected ponds, were designed to afford red drum sub-habitat After 6 weeks of consuming these diets, subgroups of fish after a harsh cold-front, and it was observed A commercial alone. These studies suggest that exposure to water analysis indicated that chlorides may have been too low for by well-water + NaCl, but no survival in unamended well-water cold had the highest survival in artificial seawater followed cold tolerance were not significant in either study. consisting of air-inflated domes of plastic sheeting covering consuming these diets, subgroups of fish were stocked into 8, diet consisting of the commercial diet with additional diet containing 10% lipid and an experimental diet consisting during January 1994. The thermal refuges, consisting of air- each refuge's pond-ward side provided access for the fish. from fresh well-water used in the refuge study: unamended generally 1 'C or greater than open-pond temperatures. Fish geothermal water was successful in maintaining temperatures groups of juvenile (100 g) red drum (Sciaenops ocellatus). harsh cold-front, and it was observed that all fish in every in the refuges above those observed in open ponds. Water inadequate in chlorides and possibly other ions can result in inflated domes of plastic sheeting covering one end of Mean water temperatures inside the refuges were generally 1 menhaden oil to provide 14.5% lipid were fed to separate observed entering the refuges. The experiment ended, after a OC) from a freshwater well heated the refuges. An opening in of the commercial diet with additional menhaden oil to one end of affected ponds, were designed to afford red drum opening in each refuge's pond-ward side provided access for over well-water alone. However, fish not challenged with pond were dead. However, the refuge design utilizing provide 14.5% lipid were fed to separate groups of juvenile reduced cold tolerance of red drum. Dietary lipid effects on seawater was significantly (P< 0.05) lower than the other study with juvenile red drum (> 7 g) was conducted in which sub-habitat warmer than other parts of the ponds. Geothermal survival of red drum at stressful low temperatures. Another the fish. Mean water temperatures inside the refuges were The median lethal temperature for fish held in the artificial the same diets were fed for 6 weeks, after which fish were thermal refuges, during January 1994. The thermal refuges, transferred to the following three water treatments prepared treatments were subjected to an acute cold-tolerance assay. treatments; well-water + NaCi did not increase cold-tolerance warmer than other parts of the ponds. Geothermal water (22 water (22 OC) from a freshwater well heated the refuges. An water + NaCi (6 '/.. salinity). Fish in these water well-water; artificial seawater (6 '/.. salinity); and well- were observed entering the refuges. The experiment ended, were stocked into 8, 0.04-ha earthen ponds, with or without |
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| Item Description: | "Major subject: Wildlife and Fisheries Sciences". Vita. |
| Physical Description: | viii, 58 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |