Fish Population Dynamic and Stock Assessment (2+1)

Solution for purse seine

1. Calculation of CPUE

CPUE = Yield / Effort

i. 1998 = 70/5 = 14

ii. 1999 = 200/20 = 10

iii. 2000 = 300/40 = 7.5

iv. 2001 = 250/10 = 25

2. Calculation of mean CPUE = 14 + 10 + 7.5 + 25 / 4

$$\overline{CPUE}$$=14.125

3. Calculation of relative CPUE

Ri (Y) = $${CPUE i(Y)} \over{\overline{CPUE} i(Y1,Y2,....)}$$

i. 1998 = 14/14.125 = 0.9912

ii. 1999 = 10/14.125 = 0.7080

iii. 2000 = 7.5 /14.125 = 0.5310

iv. 2001 = 25/14.125 = 1.7699