The effects of hypercapnia on the growth of juvenile white sturgeon, Acipenser transmontanus
Identifieur interne : 000631 ( PascalFrancis/Curation ); précédent : 000630; suivant : 000632The effects of hypercapnia on the growth of juvenile white sturgeon, Acipenser transmontanus
Auteurs : C. E. Crocker [États-Unis] ; J. J. Cech Jr [États-Unis]Source :
- Aquaculture [ 0044-8486 ] ; 1996.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
Copyright (c) 1996 Elsevier Science B.V. All rights reserved. Environmental hypercapnia (high dissolved [CO2) results from high-density sturgeon culture in systems using O2 injection and water re-use. The influence of environmental hypercapnia on the growth of the juvenile white sturgeon, Acipenser transmontanus, (fish initial wet weight, about 4 g) was examined by exposing the fish to different CO2 concentrations in replicate, flow-through aquaria under normoxic conditions (oxygen tension, above 130 torr PO2) at 19°C. The fish were fed ad libitum rations of commercial trout pellets (Silvercup). After 28 days exposure to severe hypercapnia ([CO2, 45-75 mg l-1; pH 7.0), growth was significantly reduced (P<0.05) (the final body weight was reduced by about 38%; the specific growth rate (SGR), 1.17) compared to that of sturgeon in normocapnic water ([CO2, 0.52 mg l-1; pH 8.0; SGR, 2.86), presumably due to decreased food consumption. In two subsequent experiments (initial wet weights, approximately 1 and 3 g), a low water pH (a mean of 7.1, via HCl addition to water) did not significantly affect the growth.
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<front><div type="abstract" xml:lang="en">Copyright (c) 1996 Elsevier Science B.V. All rights reserved. Environmental hypercapnia (high dissolved [CO<sub>2</sub>
) results from high-density sturgeon culture in systems using O<sub>2</sub>
injection and water re-use. The influence of environmental hypercapnia on the growth of the juvenile white sturgeon, Acipenser transmontanus, (fish initial wet weight, about 4 g) was examined by exposing the fish to different CO<sub>2</sub>
concentrations in replicate, flow-through aquaria under normoxic conditions (oxygen tension, above 130 torr P<sub>O2</sub>
) at 19°C. The fish were fed ad libitum rations of commercial trout pellets (Silvercup). After 28 days exposure to severe hypercapnia ([CO<sub>2</sub>
, 45-75 mg l<sup>-1</sup>
; pH 7.0), growth was significantly reduced (P<0.05) (the final body weight was reduced by about 38%; the specific growth rate (SGR), 1.17) compared to that of sturgeon in normocapnic water ([CO<sub>2</sub>
, 0.52 mg l<sup>-1</sup>
; pH 8.0; SGR, 2.86), presumably due to decreased food consumption. In two subsequent experiments (initial wet weights, approximately 1 and 3 g), a low water pH (a mean of 7.1, via HCl addition to water) did not significantly affect the growth.</div>
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