Fish Population Dynamic and Stock Assessment (2+1)

Fox model

ii. Fox model

The linear form of Fox model is Ln (yi/fi) = c + d x f(i)

Y(i)/f(i) = exp{c+dxf(i)}

Effort f(i) is taken as X and Y(i)/f(i)catch/unit

Effort is taken as {Ln(Y(i)/f(i)} as Y variable

Fox model (Using the above date calculate MSY and FMSY)

Sl.No.	Effort (no. of standard vessels) (X)	Ln [y(i) / f(i)] (y)	xy	x2
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Total

Plot yield on effort and draw yield curves by two methods.

MSY =(1/d) x exp ^(c-1)

FMSY = 1/d