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Table 8.

Differences between sexes and drainages in organ mass and enzyme activities

Mass
Enzyme activity
DrainageSexBodySwimming motorHeartGillCSLDHATPase
Caroni 87.5 (23.8) 57.6 (17.7) 0.0450 (0.0148) 0.327 (0.145) 17.6 (3.35) 208 (60.9) 0.121 (0.036) 
 280 (112) 162 (63.4) 0.0924 (0.0359) 0.835 (0.295) 15.8 (2.20) 336 (115) 0.0927 (0.0162) 
Oropouche 115 (34.2) 80.8 (27.4) 0.041 (0.017) 0.315 (0.139) 16.4 (2.66) 333 (92.6) 0.119 (0.035) 
 246 (96.6) 155 (65.6) 0.170 (0.033) 1.39 (0.286) 12.5 (3.33) 368 (110) 0.0968 (0.0265) 
Yarra 120 (27.2) 80.5 (19.1) 0.0645 (0.030) 0.510 (0.164) 15.6 (2.58) 274 (70.8) 0.116 (0.022) 
 290 (96.9) 176 (53.8) 0.103 (0.053) 1.17 (0.395) 16.3 (3.31) 377 (130)  
Mass
Enzyme activity
DrainageSexBodySwimming motorHeartGillCSLDHATPase
Caroni 87.5 (23.8) 57.6 (17.7) 0.0450 (0.0148) 0.327 (0.145) 17.6 (3.35) 208 (60.9) 0.121 (0.036) 
 280 (112) 162 (63.4) 0.0924 (0.0359) 0.835 (0.295) 15.8 (2.20) 336 (115) 0.0927 (0.0162) 
Oropouche 115 (34.2) 80.8 (27.4) 0.041 (0.017) 0.315 (0.139) 16.4 (2.66) 333 (92.6) 0.119 (0.035) 
 246 (96.6) 155 (65.6) 0.170 (0.033) 1.39 (0.286) 12.5 (3.33) 368 (110) 0.0968 (0.0265) 
Yarra 120 (27.2) 80.5 (19.1) 0.0645 (0.030) 0.510 (0.164) 15.6 (2.58) 274 (70.8) 0.116 (0.022) 
 290 (96.9) 176 (53.8) 0.103 (0.053) 1.17 (0.395) 16.3 (3.31) 377 (130)  

Values are means ± S.D. (in parentheses).

Abbreviations as in Table 1;units are mg wet mass (body and swimming motor), mg dry mass (heart and gill),and i.u. mg−1 protein (CS, LDH, ATPase).

After correction for mass effects, differences between drainages were significant for all variables except ATPase, and differences between sexes were significant for body mass, swimming motor mass, CS and ATPase (excluding Yarra drainage fish).

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