Fish Population Dynamic and Stock Assessment (2+1)

Solution

1. Calculation of mean length

$$ Mean\ length \ \overline{L} t = {L (t) +(\Delta t) + L(t) \over 2}$$

$${ 36 + 25.7 \over 2} = 30.85$$

Calculate mean length for other age groups

2. Calculation of growth rate

$$ Growth\ rate = { \Delta L \over \Delta t} = { L(t) + \Delta t - L(t) \over \Delta t}$$

1. 36 – 25.7 = 10.3

Similarly calculate growth rate for other length groups.