Progressive transfer to seawater enhances intestinal and branchial Na+-K+-ATPase activity in non-anadromous rainbow trout

Authors: Fuentes J.¹; Soengas J.L.²; Rey P.¹; Rebolledo E.¹

Source: Aquaculture International, Volume 5, Number 3, 1997 , pp. 217-227(11)

Publisher: Springer

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Abstract:

Two sizes of rainbow trout [170 (4), 91 (3) g] were progressively transferred to seawater in January 1995 using three steps of 9, 20 and 28 permil . Na+-K+-ATPase activity in gills, intestine and kidney, and plasma sodium and magnesium levels were assessed in response to changed external salinity. Gradual transfer to seawater had a stimulatory effect on gill and intestinal Na+-K+-ATPase activities after the transfer to 28 permil , while its activity remained unchanged in the kidney. Plasma sodium content was not modified, while magnesium levels increased in response to increased external salinity. The size-dependent response to seawater transfer described by other authors was not detected in our experiments. The results are discussed in terms of long-term adaptation to seawater.

Keywords: ATPase activity; Plasma sodium; Rainbow trout (Oncorhynchus mykiss); Re-stricted diet; Seawater tolerance

Language: English

Document Type: Regular paper

Affiliations: 1: Laboratorio de Fisioloxia Animal – Departamento de Fisioloxia, Facultade de Bioloxia, Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain 2: Fisioloxia Animal, Facultade de Ciencias, Universidade de Vigo, Spain

Publication date: 1997-01-01