(FROM GHENO AND POINSARD, 1969)
(a) Sardinella maderensis (in %)
|
Month
|
Age |
Total |
||||||
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
||
|
Year 1966 |
|
|
|
|
|
|
|
|
|
June |
52.8 |
41.4 |
5.5 |
0 |
0 |
0 |
0 |
100 |
|
July |
36.7 |
16.6 |
21.4 |
13.0 |
10.9 |
1.5 |
0 |
100 |
|
August |
0 |
11.1 |
34.7 |
21.1 |
22.3 |
2.8 |
0 |
100 |
|
September |
72.3 |
23.1 |
4.1 |
0.4 |
0 |
0 |
0 |
100 |
|
Year 1967 |
|
|
|
|
|
|
|
|
|
June |
7.4 |
60.5 |
7.4 |
10.2 |
11.7 |
2.9 |
0 |
100 |
|
July |
0 |
91.9 |
5.6 |
2.8 |
0 |
0 |
0 |
100 |
|
August |
8.1 |
85.0 |
4.0 |
2.0 |
0 |
0 |
0 |
100 |
|
September |
1.0 |
83.7 |
7.0 |
4.0 |
3.0 |
1.2 |
0 |
100 |
|
Year 1968 |
|
|
|
|
|
|
|
|
|
June |
2.3 |
76.4 |
0.3 |
3.4 |
4.3 |
3.2 |
0.3 |
100 |
|
July |
20.9 |
50.8 |
15.6 |
2.6 |
4.8 |
2.7 |
0.4 |
100 |
|
August |
23.3 |
64.1 |
8.9 |
2.1 |
0 |
0 |
0.7 |
100 |
|
September |
4.9 |
72.8 |
19.3 |
0.7 |
0.3 |
0.7 |
0 |
100 |
|
Year
|
Age group |
|||||
|
I |
II |
III |
IV |
V |
VI |
|
|
1966 |
260 |
147 |
2 079 |
1 010 |
13 |
14 |
|
1967 |
170 |
264 |
63 |
270 |
97 |
12 |
|
1968 |
797 |
267 |
78 |
23 |
199 |
1 |
|
Source: |
Angolan catches |
|
|
1956 - 72 from Campos Rosado, 1973 |
|
|
1973 - 77 from ICSEAF Statistical Bulletin |
|
|
Congolese catches |
|
|
Industrial |
|
|
from CECAF Statistical Bulletin 1 and 2 |
|
|
Artisanal catches estimated |
|
|
Note: All industrial catches reported for CECAF Division
34.3.6 have been caught in that Division except in 1974 and 1975 when 20 and 30%
respectively came from the ICSEAF area south of the Congo River. |
|
|
South African catches |
|
|
from Gheno and de Campos Rosado, 1972 |
|
|
Catches of other countries from ICSEAF Statistical
Bulletin |
* mixed pelagic species (Chloroscombrus chrysurus, Trachurus spp., Brachydeuterus auritus, etc.)
N.K. = not known
|
Source: |
ICSEAF Div. 1.1, 1.2 and 1.3 (1956-1972) Rosado, J.M. De
Campos, 1972 |
|
|
ICSEAF Div. 1.1, 1.2 and 1.3 (1973-1977) Stat. Bull.
ICSEAF Vol. 1-7 |
|
|
CECAF Statistical Div. 34.3.6: - Centre ORSTOM, Pointe Noire,
Congo |
* Data refer to the main industrial fishing company only.
Table 5a: S. AURITA CATCH PER DAY FISHING IN CONGOLESE WATERS BY POINTE NOIRE PURSE SEINERS BY MONTH AND YEAR (UNCORRECTED FOR INCREASES IN BOAT SIZE)
|
Year |
J |
F |
M |
A |
M |
J |
J |
A |
S |
O |
N |
D |
Total |
|
1964 |
0.0 |
- |
- |
- |
- |
2.5 |
6.4 |
4.5 |
6.8 |
2.3 |
11.8 |
4.8 |
3.2 |
|
1965 |
4.2 |
10.6 |
1.6 |
1.9 |
5.1 |
5.4 |
4.4 |
2.8 |
4.0 |
4.7 |
8.6 |
6.4 |
4.8 |
|
1966 |
7.6 |
10.6 |
6.9 |
4.2 |
5.5 |
1.6 |
1.5 |
0.4 |
4.2 |
0.0 |
4.9 |
3.9 |
4.1 |
|
1967 |
1.3 |
0.5 |
0.2 |
0.7 |
0.9 |
0.2 |
1.6 |
1.3 |
2.2 |
1.1 |
2.1 |
0.3 |
1.1 |
|
1968 |
0.3 |
0.9 |
1.5 |
1.4 |
1.3 |
1.3 |
0.9 |
4.3 |
3.2 |
1.3 |
2.7 |
5.8 |
2.1 |
|
1969 |
3.6 |
4.9 |
2.0 |
3.2 |
8.5 |
6.0 |
4.7 |
6.6 |
6.4 |
11.4 |
15.3 |
8.2 |
6.7 |
|
1970 |
19.3 |
6.3 |
3.0 |
5.4 |
6.6 |
15.0 |
17.7 |
7.2 |
1.7 |
0.0 |
0.6 |
0.4 |
5.6 |
|
1971 |
1.6 |
0.3 |
0.1 |
0.0 |
6.9 |
16.0 |
2.9 |
5.0 |
0.8 |
2.3 |
1.4 |
2.5 |
2.9 |
|
1972 |
5.5 |
5.0 |
13.1 |
32.3 |
35.2 |
23.8 |
14.0 |
13.4 |
14.4 |
11.6 |
21.3 |
35.1 |
16.1 |
|
1973 |
25.0 |
15.9 |
30.4 |
15.6 |
9.4 |
26.3 |
32.4 |
29.3 |
13.7 |
13.1 |
6.1 |
19.3 |
17.3 |
|
1974 |
7.0 |
14.1 |
12.6 |
23.0 |
27.5 |
24.4 |
18.2 |
17.0 |
4.5 |
2.1 |
- |
3.7 |
10.6 |
|
1975 |
3.6 |
- |
1.7 |
|
-2.8 |
5.8 |
1.8 |
1.4 |
0.0 |
- |
- |
- |
1.5 |
|
1976 |
7.6 |
0.3 |
0.3 |
3.2 |
6.0 |
5.1 |
8.2 |
5.5 |
2.1 |
2.6 |
0.6 |
4.0 |
3.8 |
|
1977 |
3.8 |
1.2 |
3.5 |
0.6 |
2.3 |
3.0 |
4.7 |
1.8 |
0.9 |
0.3 |
0.1 |
1.7 |
2.0 |
|
1978 |
3.8 |
0.2 |
|
1.0 |
4.4 |
10.2 |
15.7 |
4.4 |
9.6 |
5.6 |
2.2 |
4.5 |
5.3 |
Table 5b: S. MADERENSIS CATCH PER DAY FISHING IN CONGOLESE WATERS BY POINTE NOIRE PURSE SEINERS BY MONTH AND YEAR (UNCORRECTED FOR INCREASES IN BOAT SIZE)
|
Year |
J |
F |
M |
A |
M |
J |
J |
A |
S |
0 |
N |
D |
Total |
|
1964 |
4.7 |
8.6 |
6.3 |
7.7 |
7.6 |
9.4 |
10.0 |
6.2 |
2.7 |
4.0 |
1.8 |
3.3 |
6.0 |
|
1965 |
3.4 |
3.7 |
5.8 |
4.1 |
8.9 |
3.1 |
8.1 |
0.9 |
6.3 |
5.8 |
9.7 |
8.9 |
5.5 |
|
1966 |
3.3 |
1.9 |
1.4 |
2.0 |
4.3 |
6.3 |
8.3 |
3.8 |
5.5 |
4.1 |
5.6 |
6.6 |
4.2 |
|
1967 |
8.7 |
6.8 |
13.9 |
9.6 |
6.1 |
13.1 |
5.5 |
11.5 |
7.6 |
3.4 |
7.9 |
8.0 |
8.2 |
|
1968 |
14.4 |
11.0 |
6.0 |
7.8 |
11.2 |
5.9 |
9.3 |
11.1 |
12.7 |
4.6 |
11.3 |
5.2 |
8.9 |
|
1969 |
6.9 |
4.8 |
11.3 |
12.2 |
12.8 |
9.7 |
4.9 |
6.1 |
1.9 |
2.3 |
2.7 |
3.9 |
6.3 |
|
1970 |
2.0 |
7.4 |
10.4 |
8.7 |
8.7 |
2.7 |
4.5 |
3.9 |
13.9 |
5.0 |
6.1 |
6.3 |
6.6 |
|
1971 |
2.2 |
4.1 |
2.9 |
8.2 |
6.2 |
4.1 |
4.2 |
8.0 |
3.5 |
1.7 |
1.7 |
3.4 |
4.0 |
|
1972 |
7.1 |
3.4 |
4.8 |
2.4 |
0.5 |
1.2 |
4.9 |
5.4 |
11.9 |
3.9 |
4.8 |
15.0 |
4.8 |
|
1973 |
8.4 |
3.3 |
2.8 |
4.7 |
6.7 |
0.6 |
3.7 |
1.2 |
7.0 |
3.0 |
3.2 |
1.0 |
3.7 |
|
1974 |
8.6 |
6.8 |
6.1 |
1.4 |
3.2 |
1.6 |
1.1 |
0.2 |
4.7 |
12.4 |
15.2 |
12.2 |
6.9 |
|
1975 |
9.4 |
14.5 |
8.2 |
11.0 |
19.4 |
5.5 |
9.7 |
8.1 |
8.7 |
10.3 |
9.5 |
9.8 |
10.0 |
|
1976 |
4.0 |
11.6 |
8.8 |
13.3 |
11.1 |
17.1 |
4.6 |
6.5 |
9.2 |
6.1 |
8.3 |
10.3 |
8.5 |
|
1977 |
6.2 |
12.0 |
8.7 |
13.2 |
24.7 |
10.1 |
8.7 |
5.6 |
6.0 |
4.0 |
5.5 |
8.2 |
9.0 |
|
1978 |
6.9 |
2.2 |
1.5 |
19.1 |
8.8 |
4.8 |
5.0 |
5.6 |
4.3 |
4.9 |
4.9 |
10.6 |
6.2 |
Table 6a: MONTHLY MEAN GONADOSOMATIC INDICES OF FEMALE S. AURITA
|
Month
|
Year |
|||||||||||
|
1967 |
1968 |
1969 |
1970 |
1971 |
1972 |
1973 |
1974 |
1975 |
1976 |
1977 |
1978 |
|
|
January |
2.83 |
4.90 |
1.87 |
1.47 |
6.40 |
6.93 |
0.60 |
2.04 |
4.80 |
4.29 |
0.90 |
6.84 |
|
February |
2.63 |
1.09 |
1.02 |
0.94 |
0.88 |
0.76 |
0.60 |
2.06 |
2.27 |
1.20 |
6.04 |
4.30 |
|
March |
1.35 |
1.62 |
0.85 |
0.75 |
- |
0.98 |
1.10 |
2.61 |
1.09 |
1.15 |
2.31 |
- |
|
April |
4.43 |
3.92 |
2.59 |
2.62 |
7.30 |
1.95 |
3.85 |
5.52 |
3.74 |
2.68 |
3.94 |
6.52 |
|
May |
5.10 |
6.52 |
4.90 |
4.87 |
10.47 |
0.72 |
3.79 |
6.33 |
2.18 |
3.86 |
10.15 |
11.26 |
|
June |
7.68 |
5.96 |
2.78 |
6.88 |
7.15 |
0.73 |
9.04 |
4.42 |
3.14 |
5.11 |
8.02 |
6.44 |
|
July |
5.49 |
6.09 |
1.17 |
2.39 |
3.49 |
1.13 |
0.64 |
1.48 |
3.48 |
4.55 |
6.22 |
4.76 |
|
August |
7.74 |
6.87 |
1.53 |
3.37 |
3.74 |
0.58 |
0.88 |
1.62 |
1.89 |
3.69 |
4.63 |
3.03 |
|
September |
6.67 |
6.04 |
1.16 |
3.98 |
8.05 |
0.65 |
0.75 |
2.75 |
2.19 |
1.11 |
4.53 |
2.33 |
|
October |
1.29 |
3.79 |
0.62 |
1.72 |
2.40 |
1.83 |
0.82 |
3.12 |
1.50 |
2.76 |
1.25 |
1.42 |
|
November |
4.23 |
3.84 |
0.81 |
1.23 |
3.76 |
0.52 |
0.71 |
2.50 |
0.93 |
2.96 |
1.11 |
1.10 |
|
December |
6.30 |
1.94 |
1.46 |
3.32 |
5.95 |
1.02 |
2.23 |
5.25 |
4.59 |
1.96 |
8.49 |
1.10 |
|
|
4.65 |
4.38 |
1.73 |
2.80 |
4.96 |
1.48 |
2.09 |
3.30 |
3.15 |
2.94 |
4.80 |
4.09 |
Source: Fontana (in press)
Table 6b: MONTHLY MEAN GONADOSOMATIC INDICES OF FEMALE S. MADERENSIS
|
Month
|
Year |
|||||||||||
|
1967 |
1968 |
1969 |
1970 |
1971 |
1972 |
1973 |
1974 |
1975 |
1976 |
1977 |
1978 |
|
|
January |
5.36 |
4.22 |
3.67 |
6.59 |
6.97 |
7.50 |
1.92 |
10.41 |
2.91 |
4.96 |
4.95 |
7.01 |
|
February |
2.36 |
3.51 |
1.67 |
3.30 |
6.97 |
3.45 |
0.70 |
5.75 |
2.31 |
4.16 |
4.52 |
4.91 |
|
March |
2.06 |
3.28 |
1.96 |
2.92 |
9.53 |
- |
1.39 |
6.23 |
2.50 |
2.62 |
10.47 |
4.37 |
|
April |
4.34 |
5.08 |
3.43 |
2.60 |
7.46 |
- |
1.76 |
4.05 |
3.25 |
4.11 |
3.59 |
3.19 |
|
May |
2.63 |
3.87 |
3.43 |
4.87 |
6.60 |
- |
0.82 |
2.49 |
3.40 |
2.56 |
2.30 |
5.03 |
|
June |
3.86 |
4.50 |
2.69 |
5.47 |
5.56 |
0.71 |
1.17 |
3.75 |
7.25 |
3.74 |
3.60 |
2.83 |
|
July |
4.51 |
5.64 |
3.18 |
4.78 |
4.66 |
- |
0.88 |
3.31 |
3.52 |
10.94 |
3.87 |
1.51 |
|
August |
5.71 |
5.40 |
3.82 |
6.24 |
7.90 |
1.01 |
1.84 |
1.58 |
4.58 |
5.38 |
5.40 |
3.69 |
|
September |
7.34 |
6.90 |
3.85 |
4.77 |
9.94 |
3.70 |
2.92 |
6.74 |
4.86 |
5.05 |
7.09 |
2.05 |
|
October |
- |
4.57 |
2.08 |
2.41 |
3.01 |
2.41 |
1.66 |
3.64 |
3.20 |
3.76 |
2.77 |
1.98 |
|
November |
3.57 |
2.69 |
1.20 |
3.27 |
3.10 |
1.41 |
1.74 |
3.66 |
3.04 |
2.90 |
5.30 |
1.83 |
|
December |
4.64 |
3.34 |
2.92 |
5.69 |
8.67 |
0.62 |
2.90 |
4.85 |
4.56 |
4.76 |
7.37 |
9.45 |
|
|
3.87 |
4.42 |
2.83 |
4.41 |
6.70 |
1.73 |
1.64 |
4.70 |
3.78 |
4.58 |
5.10 |
3.99 |
Source: Fontana (in press)
Table 7a: AVERAGE ABUNDANCE OF LARVAE OF S. MADERENSIS AT PLANKTON STATIONS SITUATED ALONG LINES FROM THE COAST SEAWARD FOR 14 LINES BETWEEN GABON AND CONGO, IN DIFFERENT MONTHS (FROM DESSIER AND PIANET, 1971). THE NUMBER OF LARVAE EXPRESSED IS A LOGARITHMIC SCALE.
|
|
Line |
May |
August |
September |
November |
January |
March |
July |
|
Libreville |
1 |
4 |
3 |
3 |
2 |
3 |
3 |
2 |
|
|
2 |
4 |
5 |
4 |
3 |
5 |
4 |
5 |
|
Cap Lopez |
3 |
4 |
5 |
3 |
3 |
4 |
3 |
4 |
|
|
4 |
4 |
6 |
|
3 |
4 |
4 |
2 |
|
|
5 |
4 |
5 |
|
2 |
2 |
5 |
|
|
|
6 |
3 |
4 |
5 |
3 |
3 |
5 |
2 |
|
|
7 |
4 |
4 |
5 |
2 |
4 |
4 |
1 |
|
|
8 |
4 |
5 |
5 |
4 |
5 |
4 |
3 |
|
|
9 |
5 |
5 |
6 |
4 |
4 |
3 |
2 |
|
|
10 |
4 |
3 |
5 |
4 |
1 |
5 |
4 |
|
|
11 |
4 |
4 |
5 |
3 |
2 |
2 |
5 |
|
Pointe Noire |
12 |
4 |
3 |
5 |
3 |
3 |
4 |
2 |
|
|
13 |
2 |
3 |
5 |
2 |
2 |
4 |
3 |
|
|
14 |
3 |
3 |
5 |
2 |
1 |
4 |
3 |
|
|
Line |
May |
August |
September |
November |
January |
March |
July |
|
Libreville |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
6 |
|
|
2 |
0 |
3 |
2 |
0 |
0 |
0 |
5 |
|
Cap Lopez |
3 |
1 |
5 |
3 |
0 |
0 |
0 |
6 |
|
|
4 |
2 |
4 |
|
0 |
0 |
0 |
4 |
|
|
5 |
3 |
2 |
|
0 |
0 |
0 |
0 |
|
|
6 |
4 |
2 |
4 |
0 |
0 |
3 |
0 |
|
|
7 |
3 |
5 |
4 |
0 |
0 |
0 |
0 |
|
|
8 |
0 |
4 |
3 |
2 |
0 |
0 |
2 |
|
|
9 |
0 |
2 |
3 |
3 |
0 |
0 |
2 |
|
|
10 |
0 |
0 |
4 |
3 |
0 |
0 |
6 |
|
|
11 |
0 |
1 |
5 |
0 |
0 |
0 |
1 |
|
Pointe Noire |
12 |
0 |
2 |
4 |
0 |
0 |
0 |
0 |
|
|
13 |
0 |
1 |
5 |
0 |
0 |
2 |
1 |
|
|
14 |
0 |
2 |
3 |
1 |
0 |
0 |
2 |
Fig. 2 Catch per unit of effort by species and area
A. Catch per boat-day of S. aurita, Congo (CECAF Division 34.3.6) (tonnes)
B. Catch per boat-day of S. maderensis, Congo (tonnes)
C. Catch per boat-year, Sardinella spp., ICSEAF Division 1.1 (x 102 tonnes)
D. Catch per boat-year, Sardinella spp., ICSEAF Division 1.2 (x 102 tonnes)
Fig. 3 Mean surface temperatures for the first quarter in the Gabon, Congo and Angola area (from Atlas of J. Merle)
Fig. 4 Mean surface temperatures for the third quarter in the Gabon, Congo and Angola area (from Atlas of J. Merle)
Fig. 5 Catch per boat day per unit hold capacity of Pointe Noire seiners, by species
M/N8488/E/9.80/1/150
