Abstract:
:Whole animal transepithelial potentials (TEP) of yearling coho salmon (Oncorhynchus kisutch) in fresh water and after transfer to seawater were recorded throughout parr-smolt transformation (smoltification) from February to August 1984, along with plasma Na(+) and Cl(-) concentrations and osmolality. Based on plasma ion regulation in seawater, the yearling coho in this study completed smoltification and attained sea-water adaptability in April. TEP in freshwater fish decreased (became inside-negative) after smoltification, and the TEP increased significantly (P < 0.01) after seawater transfer. When fish were transferred into seawater, thyroxine increased TEP of the transferred smolts by approximately 30% over the control level (P < 0.01) in April, but this did not occur when freshwater postsmolts were transferred in July and August. Hypophysectomy increased TEP (P < 0.01) in fresh water; it did not affect the TEP of the fish after seawater transfer. Ovine prolactin (3 μg/g body weight) implanted into seawater-adapted fish caused a reduction in TEP (P < 0.01) when fish were exposed to fresh water. Whole-animal TEP appears to provide a valuable index of the completion of smoltification (April-May) and a useful tool for investigating the endocrine control of salmonid osmoregulation.
journal_name
Fish Physiol Biochemjournal_title
Fish physiology and biochemistryauthors
Iwata M,Nishioka RS,Bern HAdoi
10.1007/BF02183991subject
Has Abstractpub_date
1987-01-01 00:00:00pages
25-38issue
1eissn
0920-1742issn
1573-5168journal_volume
3pub_type
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journal_title:Fish physiology and biochemistry
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