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Changes in growth and osmoregulation during acclimation to saltwater in juvenile Amur sturgeon Acipenser schrenckii
- Journal of Oceanology and Limnology Vol. 28, Issue 3, Pages: 603-608(2010)
- Affiliations：
Key and Open Laboratory of Marine and Estuarine Fisheries Resource and Ecology Ministry of Agriculture East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences
- Author bio：
- Funds：
DOI：10.1007/s00343-010-9033-2
CLC：-
Online First：20 May 2010，
Published：2010
- Accepted：
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Zhao, F., Zhuang, P., Zhang, L. et al. Changes in growth and osmoregulation during acclimation to saltwater in juvenile Amur sturgeon Acipenser schrenckii, ., Chin. J. Ocean. Limnol. 28, 603–608 (2010). https://doi.org/10.1007/s00343-010-9033-2
摘要
Abstract
We evaluated the ability of juvenile Amur sturgeon (Acipenser schrenckii) to osmoregulate and grow in saltwater. Hatchery-reared juveniles (mean weight 106.8 g
5-month old) were transferred from freshwater to 10
20
and 25 salinity saltwater over a period of 20 d. We measured the growth
serum osmolality
ion concentrations
and Na+/K+-ATPase activity. In addition
we prepared samples of gill tissue to quantify morphological changes in gill ultrastructure. Rearing in up to 25 saltwater for 30 d had no significant effect on growth. Similarly
serum osmolality and ion concentrations were similar to levels reported in other teleosts following acclimation to saltwater. Serum osmolality and Na+
Cl− concentrations increased significantly with the initial increase in salinity. Afterwards
levels tended to stabilize and then decrease. Serum K+ levels did not change during acclimation to saltwater. Gill Na+/K+-ATPase activity increased initially as salinity was increased. However
the activity later decreased and
finally stabilized at 3.7±0.1 μmol Pi/mg·prot·h in 25 saltwater (1.6 times higher than the level in those in freshwater). In fish that were held only in freshwater
the chloride cells were located in the interlamellar regions of the filament and at the base of the lamella. Following acclimation to 25 saltwater for 30 d
the number and size of chloride cells increased significantly. Our results suggest that juvenile Amur sturgeon is able to tolerate
and grow in
relatively high concentrations of saltwater.
关键词
Keywords
references
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