title: Changes in blood levels of nucleoside triphosphates, hemoglobin and hematocrits during parr-smolt transformation of coho salmon (Oncorhynchus kisutch).
abstract: Increases and subsequent decreases in gill Na+-K+ ATPase activity during parr-smolt transformation in coho salmon were accompanied by changes in blood nucleoside triphosphate (NTP) levels, hemoglobin concentrations and hematocrits. An advanced photoperiod schedule accelerated the parr-smolt transformation and the rate of changes in Na+-K+ ATPase activity, NTP and hematocrit levels. Ratios of NTP:hematocrits and of NTP:hemoglobin increased during smoltification. Hematological changes suggest preparation for increased oxygen demand during migration and greater energy requirements by erythrocytes during smoltification and sea-water adaptation.
mesh_terms: D000375:Aging; D000818:Animals; D005880:Gills / Q000201:enzymology / Q000254:growth & development; D006400:Hematocrit; D006454:Hemoglobins / Q000378:metabolism*; D012265:Ribonucleotides / Q000097:blood*; D012474:Salmon / Q000254:growth & development*; D012621:Seasons; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D006454:Hemoglobins; D012265:Ribonucleotides; D000254:Sodium-Potassium-Exchanging ATPase