Fish Population Dynamic and Stock Assessment (2+1)

Result

Tabulate the readings

Sl.No.	Length interval	Mid value	Number of specimens caught	$$L_1$$ (x)	$$\overline{L}$$	$$\overline{L}-L^'$$ (y)
1.	3-5	4	37	3
2.	5-7	6	56	5
3.	7-9	8	86	7
4.	9-11	10	129	9
5.	11-13	12	188	11
6.	13-15	14	258	13
7.	15-17	16	319	15
8.	17-19	18	352	17
9.	19-21	20	351	19
10.	21-23	22	324	21
11.	23-25	24	283	23
12.	25-27	26	239	25
13.	27-29	28	196	27
14.	29-31	30	158	29
15.	31-33	32	123	31
16.	33-35	34	93	33
17.	35-37	36	69	35
18.	38-39	38	48	37
19.	39-41	40	31	39
20.	41-43	42	18	41
21.	43-45	44	10	43
22.	45-47	46	3	45

From the above table, calculate L$$\infty$$ , K

Draw a graph $$L_1$$ as X and $$\overline{L}-L^'$$ as (Y) – apply linear regression equation, estimate K and L$$\infty$$ , Slope b = -K (Z+K)