286 



Fishery Bulletin 101(2) 



Table 1 



Parameters of the von BertalanfTy growth models for male and female finetooth sharks. Estimates are provided for models devel- 

 oped with observed and back-calculated size at age. Equation 1 is the original von BertalanfTy growth model (von BertalanfTy, 1938) 

 and Equation 2 is the modified von Bertalanffy growth model (Fabens, 1965). n = number of sharks in sample. 



Male 



Asymptotic 



standard 



error 



Lower 9.5'7< 



confidence 



limit 



Upper 95% 



confidence 



limit 



Asymptotic 

 standard 



Female 



Lower 95'7( 



confidence 



limit 



Upper 95'7r 



confidence 



limit 



Observed (Eq. 1) 

 L_(mm) 

 KUyr) 



n 



Observed (Eq. 2) 

 L„(mm) 

 A-(/yr) 

 n 



Back-calculated 

 L„(mm) 

 KUyr) 

 t^iyr) 



1337.8 

 0,412 

 -1.390 

 123 



1309.3 

 0.487 

 123 



1347.1 

 0.383 

 -1.135 

 493 



27.9 

 0.043 

 0.178 



20.657 

 0.033 



19.3 

 0.019 

 0.054 



1282.5 

 0.327 

 -1.744 



1268.4 

 0.422 



1309.2 

 0.347 

 -1.243 



1393.2 

 0.496 

 -1.037 



1350.2 

 0.551 



1385.0 

 0.419 

 -1.209 



1559.6 

 0.244 

 -2.067 

 117 



1441.6 

 0.352 

 117 



1519.1 

 0.282 

 -1.348 

 457 



69.7 

 0.036 

 0.274 



36.4 

 0.029 



35.0 

 0.018 

 0.081 



1421.6 

 0.173 

 -2.610 



1369.5 

 0.295 



1450.3 

 0.247 

 -1.490 



1697.6 

 0.315 

 -1.524 



1513.7 

 0.409 



1588.0 

 0.318 

 -1.205 



immature male was 1298 mm TL. For females, the size at 

 which 50% of the population was mature was 1230 mm TL, 

 which is about 4.3 yr of age. The smallest mature female 

 was 1187 mm TL and the largest immature female was 

 1240 mm TL. 



Natural mortality, productivity, and elasticity 



Scenario 1 Estimates of instantaneous rates of natural 

 mortality for adults ranged from a minimum of 0.162 



obtained through the Peterson and Wroblewski (1984) 

 method to a maximum of 0.499 obtained through the 

 Jensen (1996) method for an age at maturity of 3.3 yr or, 

 when expressed as survivorship, from 0.850/yr to 0.607/yr. 

 All other annual survivorship estimates for adults fell 

 within that range: 0.671/yrfor the Pauly (1980) method, 

 0.732/yr for the Jensen (1996) method based on an age at 

 maturity of 5.3 yr, 0.694/yr for the Jensen ( 1996) method 

 ba.scd on A', and 0. 745-0. 762/yrfor the Chen and Watanabe 

 (1989) method. Estimates of survivorship at age from the 



