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

AGE
3
4
5
6
7
8
9
10
11
12
13
14
15
4-14
TABLE 5. Pqrameter estimates and varianae estim;tes for the 1980
stoak size (age-speaifia) and for mean weight at age: aalaulations
are for aod in 4T-4Vn. Population numbers and their standard error
are x1o-J.
Derived from From Doubleday's method Derived from
Beacham (1980) Beacham (1980)
POPULATION POPULATION STANDARD HEAN WEIGHT STANDARD
NUHBERS* NUHBERS* ERROR (%) (kg) ERROR**
-- -- -- -- 0.47 0.096
81,766 146,451 32,760 22.37 0.65 0.135
118,184 138,392 23,084 16.68 1.00 0.186
52,526 64,122 10,718 16.72 1.41 0.273
28,705 32,893 5,386 16,37 2.28 0,533
9,130 7,135 1,391 19.50 3.18 0.968
4,674 4,102 750 18.29 3.93 1.027
2,347 1,839 345 18.70 5.97 1. 895
934 610 110 18.01 5.82 2.435
018 599 109 18.20 6.00 1. 950
177 480 75 15.56 4.82 1. 714
145 156 34 21.81 6.82 3.317
26 -- -- -- 12.92 5.797
299,206 396' 779 41,865 10.55
*refers to the population numbers at the beginning of 1980 (or to survivors at
the end of 19?9).
**aalauZated from the values of the mean relative error in % (last aolumn).
***aalaulated from equation 16.
101
(%) **""
20.52
20.78
18.61
19.34
23.36
30.43
26.12
31.74
41.84
32.50
35.55
48.64
44.87