Abstract
Lamnid sharks are difficult experimental subjects, and knowledge of their cardiovascular system has been largely based on morphological (Tota et al., 1983; Emery et al., 1985), histological (Sanchez-Quintana and Hurle, 1987; De Andres et al., 1990), biochemical (Farrell and Davie, 1991; Dickson et al., 1993), and hematological investigations (Wells and Davie, 1985; Emery, 1986). Because these sharks have a physiological capacity that exceeds other species (Graham et al., 1990), it is important to obtain cardiovascular data in living specimens. This report details in vivo studies of the cardiovascular and blood respiratory properties and the heartregulatory mechanism of shortfin mako sharks (Isurus oxyrinchus) carried out at sea on freshly collected specimens, most of which were subsequently released.
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