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Table 2.

Relative ventricle mass and enzyme activities in the compact and spongy myocardial layers of three lamniform shark species

Enzyme activity a at 20°C
CS
LDH
Species (common name)Body mass (kg)Relative ventricle mass (% body mass)Relative compact myocardial tissue (% of ventricle)CompactSpongy *CompactSpongy
Isurus oxyrinchus ∼0.17 b,c ∼36-40 b,d 37.7 44.0 494 503 
(shortfin mako shark) 26   39.9 42.8 487 495 
 49   34.2 36.3 303 343 
Lamna ditropis 127 0.18-0.20 c ∼40 d 34.5 38.0 306 312 
(salmon shark) 136   31.6 32.7 409 428 
Alopias vulpinus 21 −0.10-0.29 b ∼36 b 32.6 31.4 459 487 
(common thresher shark) 34   25.2 31.7 421 499 
 37   19.9 23.0 226 233 
 43   18.9 20.7 240 200 
Enzyme activity a at 20°C
CS
LDH
Species (common name)Body mass (kg)Relative ventricle mass (% body mass)Relative compact myocardial tissue (% of ventricle)CompactSpongy *CompactSpongy
Isurus oxyrinchus ∼0.17 b,c ∼36-40 b,d 37.7 44.0 494 503 
(shortfin mako shark) 26   39.9 42.8 487 495 
 49   34.2 36.3 303 343 
Lamna ditropis 127 0.18-0.20 c ∼40 d 34.5 38.0 306 312 
(salmon shark) 136   31.6 32.7 409 428 
Alopias vulpinus 21 −0.10-0.29 b ∼36 b 32.6 31.4 459 487 
(common thresher shark) 34   25.2 31.7 421 499 
 37   19.9 23.0 226 233 
 43   18.9 20.7 240 200 
a

Enzyme activities are expressed as μmol substrate converted to product per min (IU) per g wet mass of tissue.

b

Data from Emery et al.(1985).

c

D. Bernal, N. C. Lai, W. Lowell, K. Dickson, C. Sepulveda and J. Graham,unpublished.

d

D. Bernal and J. Graham, unpublished.

*

Spongy myocardium CS activities are significantly higher(P<0.05) than in compact myocardium.

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