...Jeanine M. Donley; Robert E. Shadwick; Chugey A. Sepulveda; Douglas A. Syme The work loop technique was used to examine contractile properties of the red aerobic locomotor muscle (RM) in the ectothermic leopard shark Triakis semifasciata and endothermic shortfin mako shark Isurus oxyrinchus...

...Jeanine M. Donley; Robert E. Shadwick; Chugey A. Sepulveda; Peter Konstantinidis; Sven Gemballa SUMMARY The dynamics of steady swimming were examined in the shortfin mako( Isurus oxyrinchus ), a member of the cartilaginous fish family Lamnidae, a family known for their morphological adaptations...

... fiber diameter, high capillary density and greater myoglobin concentration) increasing O 2 flux from RM capillaries to the mitochondria. A study of the structural and biochemical features of the mako shark ( Isurus oxyrinchus ) RM was undertaken to enable performance-capacity comparisons of tuna...

... a maximal value at speeds approaching U crit , suggesting that red muscle contraction velocity may limit sustained swimming speed. The TBF of both Triakis and Negaprion rises at a faster rate with swimming velocity than does that of the more thunniform mako shark (Isurus oxyrinchus Rafinesque...