Abstract
Interest in culturing the Pacific white shrimp Litopenaeus vannamei in low-salinity and brackish-well waters has led to questions about the ability of this species to osmo- and ionoregulate in environments containing low concentrations of ions and in environments with ionic ratios that differ from those found in sea water. After seven days, hemolymph osmolality and potassium, sodium and calcium values were all significantly affected by salinity (as artificial sea salt) with values decreasing with decreasing salinity. These decreases were small, however, relative to decreases in salinity, indicating iono- and osmoregulation with adjustment for gradients. The hemolymph osmolality and sodium and calcium concentrations in shrimp exposed to either 2 g/L artificial sea salt or 2 g/L mixed-ion solution (a mixture of sodium, potassium, calcium, and magnesium chlorides that approximate the concentrations and ratios of these cations found in 2 g/L dilute seawater) did not differ significantly. However, hemolymph potassium levels were significantly lower in shrimp held in the mixed-ion environment. Potassium influx rates were similar in shrimp held in either artificial sea salt or mixed ions. The results of this study indicate that salinity affects hemolymph-cation concentrations and osmolality. Further, differential potassium-influx rates do not appear to be the basis for low hemolymph potassium levels observed in shrimp held in mixed-ion environments.
| Original language | English |
|---|---|
| Pages (from-to) | 176-180 |
| Number of pages | 5 |
| Journal | Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology |
| Volume | 145 |
| Issue number | 2 |
| DOIs | |
| State | Published - Oct 1 2006 |
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Keywords
- Ion regulation
- Low salinity
- Potassium flux
- Shrimp
ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Physiology
Cite this
Hemolymph osmolality and cation concentrations in Litopenaeus vannamei during exposure to artificial sea salt or a mixed-ion solution : Relationship to potassium flux. / Sowers, A. D.; Young, S. P.; Grosell, Martin; Browdy, C. L.; Tomasso, J. R.
In: Comparative Biochemistry and Physiology - A Molecular and Integrative Physiology, Vol. 145, No. 2, 01.10.2006, p. 176-180.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hemolymph osmolality and cation concentrations in Litopenaeus vannamei during exposure to artificial sea salt or a mixed-ion solution
T2 - Relationship to potassium flux
AU - Sowers, A. D.
AU - Young, S. P.
AU - Grosell, Martin
AU - Browdy, C. L.
AU - Tomasso, J. R.
PY - 2006/10/1
Y1 - 2006/10/1
N2 - Interest in culturing the Pacific white shrimp Litopenaeus vannamei in low-salinity and brackish-well waters has led to questions about the ability of this species to osmo- and ionoregulate in environments containing low concentrations of ions and in environments with ionic ratios that differ from those found in sea water. After seven days, hemolymph osmolality and potassium, sodium and calcium values were all significantly affected by salinity (as artificial sea salt) with values decreasing with decreasing salinity. These decreases were small, however, relative to decreases in salinity, indicating iono- and osmoregulation with adjustment for gradients. The hemolymph osmolality and sodium and calcium concentrations in shrimp exposed to either 2 g/L artificial sea salt or 2 g/L mixed-ion solution (a mixture of sodium, potassium, calcium, and magnesium chlorides that approximate the concentrations and ratios of these cations found in 2 g/L dilute seawater) did not differ significantly. However, hemolymph potassium levels were significantly lower in shrimp held in the mixed-ion environment. Potassium influx rates were similar in shrimp held in either artificial sea salt or mixed ions. The results of this study indicate that salinity affects hemolymph-cation concentrations and osmolality. Further, differential potassium-influx rates do not appear to be the basis for low hemolymph potassium levels observed in shrimp held in mixed-ion environments.
AB - Interest in culturing the Pacific white shrimp Litopenaeus vannamei in low-salinity and brackish-well waters has led to questions about the ability of this species to osmo- and ionoregulate in environments containing low concentrations of ions and in environments with ionic ratios that differ from those found in sea water. After seven days, hemolymph osmolality and potassium, sodium and calcium values were all significantly affected by salinity (as artificial sea salt) with values decreasing with decreasing salinity. These decreases were small, however, relative to decreases in salinity, indicating iono- and osmoregulation with adjustment for gradients. The hemolymph osmolality and sodium and calcium concentrations in shrimp exposed to either 2 g/L artificial sea salt or 2 g/L mixed-ion solution (a mixture of sodium, potassium, calcium, and magnesium chlorides that approximate the concentrations and ratios of these cations found in 2 g/L dilute seawater) did not differ significantly. However, hemolymph potassium levels were significantly lower in shrimp held in the mixed-ion environment. Potassium influx rates were similar in shrimp held in either artificial sea salt or mixed ions. The results of this study indicate that salinity affects hemolymph-cation concentrations and osmolality. Further, differential potassium-influx rates do not appear to be the basis for low hemolymph potassium levels observed in shrimp held in mixed-ion environments.
KW - Ion regulation
KW - Low salinity
KW - Potassium flux
KW - Shrimp
UR - http://www.scopus.com/inward/record.url?scp=33748703907&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33748703907&partnerID=8YFLogxK
U2 - 10.1016/j.cbpa.2006.06.008
DO - 10.1016/j.cbpa.2006.06.008
M3 - Article
VL - 145
SP - 176
EP - 180
JO - Comparative Biochemistry & Physiology; A: Comparative Physiology
JF - Comparative Biochemistry & Physiology; A: Comparative Physiology
SN - 1095-6433
IS - 2
ER -