Kidney ATPase response in seawater-transferred rainbow trout (Oncorhynchus mykiss). Effect of salinity and fish size.
Two sizes of domesticated rainbow trout (Oncorhynchus mykiss, 40 +/- 0.67 and 180 +/- 3.9 g) were directly transferred to brackish water (9 ppt) and seawater (28 ppt). Kidney Na(+)-K(+)-ATPase and Mg(2+)-ATPase activities were measured in fresh water, and after long-term seawater adaptation (up to 21 days). Renal Na(+)-K(+)-ATPase activity increased after saltwater loading in small trout, while large trout displayed an unmodified ATPase activity. The smallest trout showed a low but progressive increase in renal Mg(2+)-ATPase activity after the transfer to both salinities. However, ATPase activity remained unchanged or significantly decreased in large trout after the transfer to seawater or brackish water, respectively.
Fuentes
J
J
Laboratorio de Fisioloxía Animal, Facultade de Bioloxía, Universidade de Santiago de Compostela, Spain.
Soengas
J L
JL
Buceta
M
M
Otero
J
J
Rey
P
P
Rebolledo
E
E
D000222:Adaptation, Physiological; D000704:Analysis of Variance; D000818:Animals; D001835:Body Weight; D017301:Ca(2+) Mg(2+)-ATPase / Q000737:chemistry; D007668:Kidney / Q000201:enzymology* / Q000378:metabolism / Q000502:physiology; D017686:Oncorhynchus mykiss; D012623:Seawater; D012965:Sodium Chloride / Q000378:metabolism* / Q000494:pharmacology; D000254:Sodium-Potassium-Exchanging ATPase / Q000737:chemistry
D012965:Sodium Chloride; D017301:Ca(2+) Mg(2+)-ATPase; D000254:Sodium-Potassium-Exchanging ATPase