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Osmoregulation in juvenile and adult white sturgeon, Acipenser transmontanus

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Blood samples from cannulated young adult (2.5–15 kg) white sturgeon, acclimated to San Francisco Bay water (24 ppt) had plasma values of 248.8 ± 13.5 mOsm kg−1 H2O, [Na+] = 125 ± 8.0 mEq 1−1, [K+] = 2.6 ± 0.8 mEq 1−1 and [CL−] = 122 ± 3.0 mEq 1−1. Freshwater acclimated sturgeon had an osmolality of 236 ± 7, [Na+] = 131.6 + 4.4, [K+] = 2.5 ± 0.7 and [CL−] = 110.6 ± 3.6. Freshwater acclimated fish gradually exposed to sea water (increase of 5 ppt h−1) had higher plasma osmolalities than did the bay water acclimated fish. These young adult sturgeon are able to tolerate transfer from fresh water to sea water as well as gradual transfer from sea water to fresh water. Plasma electrolytes in transferred fish are regulated, but tend to differ from long term acclimated fish at the same salinities. There is a gradual increase in the upper salinity tolerance (abrupt transfer) of juvenile white sturgeon with weight: 5–10 ppt for 0.4–0.9 g fish, 10–15 ppt for 0.7–1.8 g fish, and 15 ppt for 4.9–50.0 g fish. The ability of juveniles to regulate plasma osmolality is limited. The young adult fish are able to tolerate higher salinities (35 ppt) than juvenile sturgeon but probably are also characterized by low activity of the necessary ion exchange mechanisms in the gills which permit rapid adjustment of blood electrolytes with graduate change in external salinity.

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Authors and Affiliations

  1. Departments of Zoology and Wildlife and Fisheries Biology, University of California, Davis, CA, 95616, U.S.A.

    Maryann McEnroe & Joseph J. Cech Jr.

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  1. Maryann McEnroe
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  2. Joseph J. Cech Jr.
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McEnroe, M., Cech, J.J. Osmoregulation in juvenile and adult white sturgeon, Acipenser transmontanus . Environ Biol Fish 14, 23–30 (1985). https://doi.org/10.1007/BF00001573

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  • DOI: https://doi.org/10.1007/BF00001573

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