CalCOFI Reports, Vol. 30, 1989 - California Cooperative Oceanic ...

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LO AND METHOT: 1988 NORTHERN ANCHOVY SPAWNING BIOMASS
CalCOFl Rep., Vol. 30,1989
TABLE 2 (continued)
United States Fishery Landings and Weight at Age
Year
1980
1981
1982
1983
1984
1985
1986
1987
Month
2-3
4-6
7-9
10-1
2-3
4-6
7-9
10- 1
2-3
4-6
7-9
10- 12
1-3
4-6
7-9
10- 12
1-3
4-6
7-9
10- 12
1-3
4-6
7-9
10- 12
1-3
4-6
7-9
10- 12
1-3
4-6
7- 10
11-12
Landings
(MT)
207
26730
3374
27401
432
34699
2878
9151
375
40808
3044
2872
526
4561
2218
1182
427
3680
2266
929
503
1064
2727
1490
456
1648
2519
881
370
1013
2965
527
Weight at age (g)
0 1 2 3 4 5+
3.5
6.8
11.0
9.5
3.4
6.5
11.0
7.6
3.4
7.3
10.6
11.9
3.2
7.4
10.6
12.2
2.5
6.8
10.5
12.0
2.8
7.3
10.7
12.1
2.7
6.4
10.6
12.1
2.9
6.7
10.9
12.4
12.2
11.2
15.2
14.2
12.2
14.0
15.3
17.0
12.2
14.4
14.8
16.8
12.2
13.4
14.9
17.0
11.9
13.6
14.9
16.8
12.0
13.5
15.0
16.9
12.1
13.8
14.9
16.9
12.1
13.5
15.4
17.1
15.7
18.4
18.4
19.2
15.6
15.8
18.4
18.3
15.6
18.5
18.4
19.4
15.8
17.8
18.4
19.4
15.7
17.4
18.4
19.4
15.6
17.7
18.4
19.5
15.8
17.2
18.4
19.4
15.7
17.5
18.6
19.6
19.1
20.8
19.9
21.5
18.9
19.7
19.9
20.4
19.0
20.2
20.0
21.5
19.4
20.1
20.0
21.7
19.0
20.0
20.0
21.5
18.8
20.1
20.0
21.7
19.3
19.9
20.0
21.6
19.0
20.1
20.2
22.2
23.1
24.1
22.3
22.8
22.9
21.9
22.3
25.1
23.0
22.2
22.3
23.7
23.5
22.4
22.3
23.9
22.9
22.8
22.3
23.8
22.7
22.5
22.3
24.0
23.2
23.1
22.3
23.9
23.0
22.9
22.5
24.5
28.6
27.7
26.8
27.6
28.5
28.6
26.7
26.8
28.6
25.2
27.2
26.5
28.7
27.9
27.2
26.5
28.3
28.0
27.2
26.5
28.3
28.0
27.1
26.7
28.5
28.1
27.2
26.6
28.4
28.0
26.9
26.8
62% of the 200,000-MT optimum yield. The landings
data are necessary for calculating survivorship
from the previous year's biomass estimate.
Monthly landings, age composition, and weightat-age
data for 1987 were obtained from CRIP (tables
3-5. For data sources for years before 1987, see
Methot 1986). The CRIP port sampling program
collected monthly anchovy samples from randomly
selected fishing boats. Hundreds to thousands of
fish were measured, and age was determined from
otolith readings (W. Garcia F., pers. comm.). The
age composition from the autumn fishery reveals
TABLE 3
Mexican Fishery Data, 1987
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Landings
Age composition
Month (MT) 0 1 2 3
1 73 0 0 0 0
2 0 0 0 0 0
3 95 0 468 33 7
4
0
0
4
~
5+
0
0
0
N
aged
- -
0
0
512
~
0
0'
0
0
Weight at age (g) x 10
1 2 3 4
0
0
63
0
0
120
0
0
120
0
0
130
5+
0
0
0
4 4359 0 684 241 60
5 23041 0 1105 189 74
12
28
8
15
1005
141 1
0
0
99
104
104
106
133
174
186
199
178
218
6 16455 368 491 43 45
7 22298 512 476 122 39
11
3
23
4
98 1
1156
40
47
152
125
133
128
221
144
232
195
246
214
8 29768 338 201 251 14
9 16291 1359 180 668 91
10 11030 493 33 332 187
11 1065 253 44 82 12
12 0 0 0 0
__
0
'In Weight at age section, 0 indicates that no samples were taken
2
3
36
0
0
0
0
8
0
0
806
2301
1089
391
0
71
67
75
90
0
135
121
127
109
0
130
111
134
127
0
155
118
128
0
0
223
117
129
0
0
.~
0
0
159
0
0
21