Preliminary demographic analysis of the shortfin mako shark, Isurus oxyrinchus. Mollet H. F. and Cailliet G. M. Contrasting VBGF and Reproductive Parameters for the Shortfin Mako Pratt and Casey 1983 vs. Cailliet et al. 1983.
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Mollet H. F. and Cailliet G. M.
Age at Maturity of Female Shortfin Mako Shortfin Mako(when 10 and 90% are mature)1. L (t) = 3.73 - (3.73 - 0.70) e(-0.203 t), Pratt and Casey 19832. L (t) = 3.21 - (3.21 - 0.76) e(-0.072 t), Cailliet et al. 1983
Observed and Calculated (from VBGF) Growth Rates Shortfin Makofor the Shortfin Mako1. L (t) = 3.73 - (3.73 - 0.70) e (-0.203 t), Pratt and Casey 19832. L (t) = 3.21 - (3.21 - 0.76) e (-0.072 t), Cailliet et al. 1983
Catch Curve for Makos taken by Japanese Longliners off the eastern coast of Australia(Stevens 1992)can add n=98 females, Z = 0.61 but # to small to derive meaningful catch curve. Could try smoothing.
Catch Curve for Shortfin Mako off East Northland and Bay of Plenty, New Zealand 1974-90 (Saul and Holdsworth 1992)(females extracted and large females from off-shore added)
Effective Natality vs. TL 1961-90 (Pepperell 1992)10, 50, 90% mature at TL = 2.60, 2.72, 2.85 m)mx(TL) = (1/4) 0.572 TL2.66e(-47.481+17.505 TL)/(1+e(-47.481+17.505 TL));
Effective Natality vs. Age 1961-90 (Pepperell 1992)10, 50, 90% mature at age 4.8, 5.4, 6.1yrmx = (1/4) 0.572 TL2.66.e(-47.481+17.505 TL)/(1+e(-47.481+17.505 TL));with TL = 3.734-(3.734-0.702)e(-0.203 age)
Life-History Table of 1961-90 (Pepperell 1992)Isurus oxyrinchusInput: VBGF, Z = 0.30 year-1, mx = effective natalityOutput: Ro = 2.0, G = 9.0 year, r = 0.076 year-1, er = 1.08
Life-History Table of 1961-90 (Pepperell 1992)Isurus oxyrinchusInput: VBGF, Z = 0.34 year-1, mx = effective natalityOutput: Ro = 1.08, G = 9.72 year, r = 0.0084 year-1, er = 1.01
D23 To be finalized if needed. Got a slight problem because Z derived from the corresponding catch curve is expected to be 0.34 (input) and not 0.348