Fish Population Dynamic and Stock Assessment (2+1)

Problem : 1

Using the following data, calculate the growth rate and mean length of a stock.

Age (t) (years)	Length (Lt) (cm)
1	25.7
2	36.0
3	42.9
4	47.5
5	50.7
6	52.8
7	54.2

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

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

t is expressed in unit of years.

Draw a graph to estimate $$L_\infty$$ , by taking $$\overline{L}$$ as‘x’ and $${\Delta L \over \Delta t}$$ as‘y’