62 
Fishery Bulletin 110(1) 
Table 4 
Mean daytime biomass density (kg nmr 2 ) and transect length (km) for each transect used to estimate the mean biomass densi- 
ties and variances of fish for each stratum and survey. The respective stratum areas are defined in Table 3. 
Survey Stratum 
Sardine 
( Sardinops sagax) 
Jack mackerel 
( Trachurus symmetricus) 
Pacific mackerel 
( Scomber japonicus ) 
Mean density 
Length 
Mean density 
Length 
Mean density 
Length 
Spring 2008 1 
2911.2 
162.2 
3855.7 
128.6 
288.0 
128.6 
14,315.0 
37.3 
843.9 
71.7 
0 
71.7 
18,371.2 
73.5 
5090.5 
162.2 
214.3 
162.2 
2097.2 
68.4 
0 
37.3 
0 
37.3 
86.0 
127.9 
5583.7 
72.8 
754.8 
72.8 
2782.1 
87.5 
7291.0 
68.4 
1669.3 
68.4 
1520.6 
186.6 
692.1 
196.9 
47.0 
196.9 
— 
— 
2311.8 
87.5 
3510.1 
87.5 
— 
— 
7572.2 
186.6 
807.8 
186.6 
2 
42,629.8 
184.4 
1.0 
184.4 
— 
— 
21,369.0 
306.1 
1563.4 
306.1 
— 
— 
23,365.2 
289.8 
1119.3 
289.8 
— 
— 
30,472.1 
270.6 
3943.9 
270.6 
— 
— 
37,045.3 
367.9 
785.5 
367.9 
— 
— 
33,815.6 
286.9 
10,408.3 
286.9 
— 
— 
Summer 2008 Coastal 
194,144.9 
19.1 
— 
— 
— 
— 
26.0 
27.7 
— 
— 
— 
— 
47,810.3 
27.0 
— 
— 
— 
— 
429.3 
20.9 
— 
— 
— 
— 
190.9 
22.9 
— 
— 
— 
— 
5514.3 
20.4 
— 
— 
— 
— 
3399.4 
26.1 
— 
— 
— 
— 
64,819.1 
30.0 
— 
— 
— 
— 
232,487.8 
24.0 
— 
— 
— 
— 
31,404.8 
26.7 
— 
— 
— 
— 
17.7 
21.5 
— 
— 
— 
— 
1 
76,099.4 
57.1 
3814.7 
183.2 
2277.4 
175.7 
401.0 
32.2 
1430.7 
136.3 
19.9 
168.5 
31,959.5 
107.1 
— 
— 
3192.2 
190.8 
4689.2 
51.2 
— 
— 
2783.3 
162.3 
23,070.9 
82.9 
— 
— 
0 
251.5 
2684.6 
76.6 
— 
— 
1600.7 
231.3 
1973.8 
81.8 
— 
— 
19.0 
235.6 
20,620.5 
112.9 
— 
— 
71.4 
238.1 
65,051.0 
104.7 
— 
— 
— 
— 
12692.6 
116.3 
— 
— 
— 
— 
8850.0 
20.5 
— 
— 
— 
— 
43.4 
112.1 
— 
— 
— 
— 
2 
440.1 
178.5 
708.1 
168.5 
— 
— 
27.6 
144.8 
96.9 
190.8 
— 
— 
5.8 
88.1 
1835.5 
162.3 
— 
— 
31.7 
155.6 
2553.8 
251.5 
— 
— 
212.6 
161.1 
12,713.7 
231.3 
— 
— 
35.6 
80.6 
21,192.0 
235.6 
— 
— 
8742.8 
122.8 
8583.3 
238.1 
— 
— 
— 
- 
4944.7 
274.4 
— 
— 
— 
— 
1262.4 
191.4 
— 
— 
457.4 
249.3 
— 
— 
— 
— 
31.3 
189.5 
— 
— 
