Fish Population Dynamic and Stock Assessment (2+1)

Problem 2

Standardize the relative CPUE for 2 types of net namely purse seine and trawl net.

Year	Purse seine		Trawl net
	Yield	Effort	Yield	Effort
1998	70	5	250	20
1999	200	20	150	10
2000	300	40	300	20
2001	250	10	200	50

Calculate mean CPUE for the 4 years and arrive for the relative CPUE for each year. Estimate the relative effort of the year assuming Y_T ie. Yield in a year.

Year	YT (tonnes)
1998	3000
1999	4000
2000	7500
2001	6000

Calculate the normalized relative yield for the four years.