Effects of salinity and specific salts on the physiology of juvenile red drum (Sciaenops ocellatus), in the context of saline aquaculture in west Texas /
West Texas saline groundwaters were bioassayed to assess their potential as an aquacultural medium for red drum (Sciaenops ocellatus); subsequent salt-augmentation bioassays sought to resolve physiological effects of specific salts, and their ionic components, on aquacultural performance of red drum...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=741965271&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | West Texas saline groundwaters were bioassayed to assess their potential as an aquacultural medium for red drum (Sciaenops ocellatus); subsequent salt-augmentation bioassays sought to resolve physiological effects of specific salts, and their ionic components, on aquacultural performance of red drum. In these 30-d tests withjuvenile red drum (0.4-3.0 g), highest survival was in a 5-ppt salinity, high sulfate (1,723 mg L-' ), high calcium (427 mg L-' ) groundwater from a windmill catchment pond in Pecos County. The lowest survival was in a 35-ppt saline groundwater from a gravel pit, also in Pecos County. Calcium chloride (CaC'2) addition to a 3-ppt, Reeves County groundwater low in Ca 12 resulted in the greatest increase in survival, from 0 to 93 %. It was unclear whether the beneficial effect of CaC'2 was a result of increasing Ce 2 concentrations (36 to 336 mg L-'), increasing Cl- concentrations (639 to 1,296 mg L-1), or both. Calcium chloride and MgC'2 promoted red drum survival when added to extremely dilute (0.2-ppt) artificial seawater. Although MgC'2 addition improved survival more than CaC'2 at similar Cl- concentrations, CaC'2 improved growth more than MgCI2. This result suggests that addition of a single salt to soft water would not 3-ppt ASW (artificial seawater) supplemented with MgSO4 or Na2SO4 did not significantly affect survival, growth, routine metabolic rate, critical oxygen concentration, or marginal metabolic scope of red drum. Fish survival was directly related to salinity of artificial seawater dilutions, over the salinity range 0. I to 3.0 ppt. Salinity appears to be the most important factor in predicting the red drum aquaculture potential of a saline groundwater, with the optimum salinity being 5-15 ppt. Although survival can be excellent at salinities below and above this range, it will be unpredictable. Stress associated with culture conditions, and non-optimal ionic concentrations may narrow the optimum range. Metal concentrations tended to be higher in saline groundwaters than in typical U. S. surface waters. However, red drum cultured in saline groundwaters for 30 d did not contain whole-body metal concentrations that would pose a substantial health risk to human consumers. |
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| Item Description: | "Major Subject: Wildlife and Fisheries Sciences." Pagination error, vita missing. |
| Physical Description: | xii, 88 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |