Bottom Trawl Surveys - Proceedings of a Workshop Held at Ottawa ...

TABLE B. Relative error (expressed in %) for age-specific indices of
stock size, as calculated from the 1970-1979 trawl research surveys for
cod in 4T-4Vn. Derived from data provided by P, KoelZer, St. Andrews
Biological Station.
Age 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 mean
(%)
1 164 81 70 63 149 310 75 42 160 56 117 .o
2 47 32 84 25 36 68 53 21 31 31 42.8
3 48 12 24 22 18 97 34 20 41 17 33.3
4 52 18 18 20 11 49 17 20 52 14 27.1
5 35 21 44 19 10 34 31 78 54 13 33.9
6 37 21 39 17 8 45 40 121 36 10 37.4
7 39 23 28 17 9 36 48 159 30 9 39.8
8 70 18 23 16 9 33 39 61 30 11 31.0
9 91 29 19 17 8 31 48 78 57 28 40.6
10 135 75 28 22 16 87 39 85 47 53 58.7
11 67 68 33 23 23 36 41 67 112 25 49.5
12 98 12 32 49 29 41 52 55 102 29 49.9
13+ 244 31 45 40 37 53 59 168 49 80.7
mean 53.1 20.3 27.9 18.3 10.4 46.4 36.7 76.7 42.9 14.6
(3-9)
105