Fish Population Dynamic and Stock Assessment (2+1)

7.1.3. Assumption to be taken for using Analytic model

1. Recruitment, fishing and natural mortalities in a stock should be constant.

2. All fish of a cohort are hatched on the same date

3. Recruitment and selection are ‘Knife-edge’.

4. There should be complete mixing within the stock

5. The length-weight relationship has an exponent 3, i.e. Wq x L³.

Under these assumptions, the yield from a cohort during its life span is equal to the yield from all cohorts during a year.