By Robert E. Shadwick, Anthony P. Farrell, Colin J. Brauner
Fish body structure: body structure of Elasmobranch Fishes, quantity 34B is an invaluable reference for fish physiologists, biologists, ecologists, and conservation biologists. Following a rise in examine on elasmobranchs end result of the plight of sharks in today’s oceans, this quantity compares elasmobranchs to different teams of fish, highlights parts of curiosity for destiny study, and provides point of view on destiny difficulties. protecting measurements and lab-and-field dependent experiences of enormous pelagic sharks, this quantity is a normal addition to the well known Fish Physiology series.
- Provides wanted accomplished content material at the body structure of elasmobranchs
- Offers a structures procedure among constitution and interplay with the surroundings and inner physiology
- Contains contributions by means of best specialists of their respective fields, below the tips of the world over well-known and hugely revered editors
- Highlights parts of curiosity for destiny learn, together with standpoint on destiny problems
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Extra resources for Physiology of Elasmobranch Fishes: Internal Processes
This implies that an arterial blood supply to the spongy myocardium (which is one of the defining characteristics of Type III and Type IV hearts) is 20 RICHARD W. BRILL AND N. CHIN LAI necessary for the maintenance of cardiac power output. Other evidence supportive of our contention are the observations that: 1. maximum cardiac power output is reduced by 64% when isolated spiny dogfish hearts specifically deprived of coronary circulation are perfused with a severely hypoxic (PO2 ¼ 1 kPa) Ringer’s solution (Davie and Farrell, 1991a); 2.
1) between the two species is lower than the ratio of cardiac power demand per unit body mass (W10:1, Brill 1. 23 ELASMOBRANCH CARDIOVASCULAR SYSTEM and Bushnell, 2001) because of tunas’ relatively larger hearts. , 2003b). The increased power production per unit ventricle mass is reflected in myocardial enzyme activities. Comparing representative enzyme activity data for rainbow trout and skipjack and yellowfin tunas (Fig. 4), it’s apparent that the tunas’ higher cardiac energy production is reflected in higher activities of CS, PK, LDH per unit weight.
2011). For these reasons alone, we consider that research to gain a better understanding of the effects of hypoxia on a range of elasmobranch species is clearly warranted. We also posit, however, that the species-specific tolerances of hypoxia are informative with respect to the diversity of elasmobranch cardiovascular physiology. , 2008); Atlantic stingray, Dasyatis sabina, in seagrass meadows 1. , 2011; Coffey and Holland, pers. , 2014). In addition, at least two species, the torpedo ray (Torpedo marmorata) and epaulette shark (Hemiscyllium ocellatum), are routinely subjected to extended periods of severely hypoxic conditions.