Increased reliance on coronary perfusion for cardiorespiratory performance in seawater-acclimated rainbow trout.

ABSTRACT: Salmonid ventricles are composed of spongy and compact myocardium, the latter being perfused via a coronary circulation. Rainbow trout (Oncorhynchus mykiss) acclimated to sea water have higher proportions of compact myocardium and display stroke volume-mediated elevations in resting cardiac output relative to freshwater-acclimated trout, probably to meet the higher metabolic needs of osmoregulatory functions. Here, we tested the hypothesis that cardiorespiratory performance of rainbow trout in sea water is more dependent on coronary perfusion by assessing the effects of coronary ligation on cardiorespiratory function in resting and exhaustively exercised trout acclimated to fresh water or sea water. While ligation only had minor effects on resting cardiorespiratory function across saliniti

SUBMITTER: Wallbom N 

PROVIDER: S-EPMC10088527 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature