... the possibility that cardiac performance may limit their thermal niches. We used an in situ perfused heart preparation to investigate the effects of acute temperature change and the effects of epinephrine and extracellular Ca 2+ on cardiac function in yellowfin tuna ( Thunnus albacares ). Heart rate showed...

... lamprey ( Lampetra fluviatilis ) and common carp ( Cyprinus carpio ) were held in 400l freshwater tanks at Odense University, Denmark. Yellowfin tuna ( Thunnus albacares ) were maintained in circular outdoor tanks at the Kewalo Research Facility (National Marine Fisheries Service, Honolulu Laboratory...

...Torre Knower; Robert E. Shadwick; Stephen L. Katz; Jeffrey B. Graham; Clement S. Wardle ABSTRACT To learn about muscle function in two species of tuna (yellowfin Thunnus albacares and skipjack Katsuwonus pelamis ), a series of electromyogram (EMG) electrodes was implanted down the length...

...H. A. Shiels; E. V. Freund; A. P. Farrell; B. A. Block ABSTRACT We used an isometric muscle preparation to test the hypothesis that yellowfin tuna Thunnus albacares utilize the intracellular Ca 2+ storage sites of the sarcoplasmic reticulum (SR) during routine contractions. Ryanodine (a blocker...

[email protected] 8 12 1997 5 2 1998 © The Company of Biologists Limited 1998 fish yellowfin tuna Thunnus albacares pelagic cardiorespiratory metabolic rate cardiac output red cell space 51 Cr dextran primary circulatory system secondary circulatory system...

... cycle frequency and power output, over a range of temperatures, in isolated bundles of slow muscle fibres from the endothermic yellowfin tuna ( Thunnus albacares ) and its ectothermic relative the bonito ( Sarda chiliensis ). Power output in all preparations was highly temperature-dependent. A counter...

...Keith E. Korsmeyer; N. Chin Lai; Robert E. Shadwick; Jeffrey B. Graham ABSTRACT Cardiac performance in the yellowfin tuna ( Thunnus albacares , 673–2470 g, 33–53 cm fork length, FL ) was examined in unanesthetized fish swimming in a large water tunnel. Yellowfin tuna were fitted with either...

...Keith E. Korsmeyer; N. Chin Lai; Robert E. Shadwick; Jeffrey B. Graham ABSTRACT Yellowfin tuna Thunnus albacares (1400–2175 g) instrumented with electrocardiogram electrodes and pre- and post-branchial catheters were subjected to incremental swimming velocity tests. Increasing velocity, from...

...Heidi Dewar; Jeffrey B. Graham; Richard W. Brill ABSTRACT The body temperatures ( T b ) of nine yellowfin tuna ( Thunnus albacares ) were monitored while fish swam in a large water tunnel at controlled velocities ( U ) and ambient temperatures ( T a ). Monitoring T b during step changes in T...

...Heidi Dewar; Jeffrey B. Graham ABSTRACT Yellowfin tuna ( Thunnus albacares ) swimming kinematics was studied in a large water tunnel at controlled swimming velocities ( U ). Quantified kinematic variables included the tail-beat frequency, stride length ( l) , caudal amplitude, yaw, the propulsive...

...Heidi Dewar; Jeffrey B. Graham ABSTRACT The metabolic rates of three tropical tunas [yellowfin tuna ( Thunnus albacares ), kawakawa ( Euthynnus affinis ) and skipjack ( Katsuwonus pelamis )] were estimated using a large water-tunnel respirometer. Experiments lasting up to 31 h were used...

... to determine the minimum size at which tunas can elevate T m significantly above T a . Measurements of T m made immediately after capture in field-caught and laboratory-raised tunas ( Euthynnus lineatus, Auxis thazard, A. rochei and Thunnus albacares ) spanning a size range of 15.5–667mm fork length (FL) show...

... albacares At similar body sizes, the metabolic rates of yellowfin tuna ( Thunnus albacares ) swimming at their minimum hydrostatic equilibrium speeds (approximately 1–2 body lengths s −1 ; Magnuson, 1978 ) are approximately 5–10 times higher than the routine metabolic rate of rainbow trout...