Production models as well as semi-quantitative methods have been used as an attempt to evaluate the potential of demersal fish stocks in the area. Results of these are presented in Table 8. The table compares these results with those obtained by the Guinean Trawling Survey (G.T.S.). The evaluations have been done by CECAF divisions.
The annual potential of demersal fish stocks in the Cape Verde Division has been estimated between 150 000 and 200 000 metric tons. In the Sherbro Division where less catch and effort data are available, a potential of between 25 000 and 40 000 tons per annum has been arrived at.
The potentials for shrimps and soles in the Cape Verde Division are given below:
|
Species |
Northern zone |
Southern zone |
|
Shrimps |
580 tons |
2 400 tons |
|
Soles |
860 tons |
1 800 tons |
Table 8 Annual potential yields as estimated by production model and semi-quantitative methods
|
Zone |
G.T.S. I |
G.T.S. II2 |
Data from Ivorian trawlers3 |
Data from Polish trawlers; Schaefer model |
Data from Japanese trawlers; Schaefer model
|
Echo integration, (Y=F×B)4 |
|
Southern Mauritania |
|
|
|
|
|
|
|
Senegal |
145 000 |
98 000 |
|
|
|
|
|
Gambia |
|
|
|
|
|
|
|
Guinea Bissau |
78 000 |
54 000 |
187 000 |
|
|
|
|
Guinea |
64 000 |
39 000 |
|
|
|
|
|
Cape Verde |
287 000 |
191 000 |
187 000 |
180 000 |
150 000 |
200 000 |
|
Sierra Leone |
26 000 |
16 000 |
43 000 |
|
|
|
|
Liberia |
14 600 |
9 000 |
43 000 |
|
|
|
|
Sherbro |
40 600 |
25 000 |
43 000 |
|
|
|
Note: all in tons1 including Brachydeuterus auritus
2 excluding Brachydeuterus auritus
3 coastal fauna between 0 and 50 m
4 Y: catch; F: fishing mortality; B: biomass
