Fish Population Dynamic and Stock Assessment (2+1)

6.4.2.3. Cadima’s formula

For estimation of exploited fish stocks for which limited stock assessment data are available, following equation is used.

MSY = 0.5 * (Y+M*$$\overline{B}$$ ) ……………………………………………. (6)

Y = total catch in a year

$$\overline{B}$$= the average biomass in the same year.

M = Natural mortality

The above equation could be used for assessing the stock where catch and effort time series are not available and in such cases the biomass estimates could be obtained from trawl or acoustic surveys.