Na/K-ATPase activity and osmo-ionic regulation in adult whiteleg shrimp Litopenaeus vannamei exposed to low salinities
Na/K-ATPase activity and osmo-ionic regulation were examined in Litopenaeus vannamei exposed to low salinities. The hemolymph osmolality of shrimp exposed to very low salinities (0.5 ppt and 1 ppt) decreased rapidly after 6 h from 800 mOsm to 540–560 mOsm; these individuals could not survive beyond...
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Published in | Aquaculture Vol. 304; no. 1; pp. 88 - 94 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.06.2010
Elsevier Elsevier Sequoia S.A |
Subjects | |
Online Access | Get full text |
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Summary: | Na/K-ATPase activity and osmo-ionic regulation were examined in
Litopenaeus vannamei exposed to low salinities. The hemolymph osmolality of shrimp exposed to very low salinities (0.5
ppt and 1
ppt) decreased rapidly after 6
h from 800
mOsm to 540–560
mOsm; these individuals could not survive beyond 1
day. Under exposure to 7
ppt, osmolality levels decreased rapidly to 630 and 570
mOsm after 6
h and 1
day respectively, whereas in shrimp exposed to 18
ppt, levels declined slowly from 800
mOsm to 700
mOsm after 6
h and thereafter remained stable for 7
days until the end of the experiment. Hemolymph sodium ion levels showed a pattern of change similar to that of hemolymph osmolality, with initial levels being 380
mmol/L and decreasing to 180
mmol/L under very low salinity. Changes in calcium, potassium, and magnesium ion concentrations were also investigated. Na/K-ATPase activity was 3.98
μmol
ADP/mg
protein/hour in the gills of control individuals maintained at 28
ppt for the experimental duration. Levels increased in individuals exposed to 18
ppt, 7
ppt and 3
ppt for 7
days to 5.06, 6.51, and 5.81
μmol
ADP/mg
protein/hour, respectively. Based on the above, it is suggested that
L. vannamei could not survive in low salinity (<
1
ppt) due to the loss of osmoregulatory capacity when the shrimps were transferred directly from high salinities to low salinities. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0044-8486 1873-5622 |
DOI: | 10.1016/j.aquaculture.2010.03.025 |