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

TABLE 2- Cod in 4T-4Vn, Projections to 1982 with varying stock size
St a t us o f cer t a1n . parame t ers 1n th e g1 ven years, Ch ange 1n percen t
given an error in the 1979 population numbers.
% of Estimated Population Population F Surplus Population Population F Surplus
1979 Population Numbers (3+) Biomass (3+) (3+) Production Numbers (3+) Biomass (3+) (3+) Production
[ 1()3] (mt] [ mt 1
70% 1979 278677 213327 0.153 61912 -30 -32 51 -31
(assumed
error =
-30%)
1980
1981
348659
353055
261674
285992
0.131
0.131
I 01525
85818
-22
-19
-32
-33
39
39
-16
-19
1982 326415 296930 0.172 75337 -17 -35 51 -21
80% 1979 318488 247596 0.131 71212 -20 -22 30 -21
( -20%) 1980 381224 302155 O.II6 107991 -IS -21 23 -II
1981 380II6 333241 O.IIS 92691 -12 -22 22 -13
1982 349500 351099 0.146 82058 -II -24 28 -14
90% 1979 358299 281813 O.II4 80526 -10 -II 13 -10
( -10%) 1980 413794 342583 0.104 II4471 -7 -II 10 -5
1981 407072 3804II 0.103 99530 -6 -II 10 -6
1982 3722ll 405085 0.128 88630 -6 -12 12 -7
100% 1979 398IIO 315997 0.101 89847 0 0 0 0
(0%) 1980 446369 382979 0.094 120958 0 0 0 0
1981 433961 427537 0.094 106345 0 0 0 0
1982 394694 458956 O.II4 95104 0 0 0 0
IIO% 1979 437921 350157 0.091 99174 10 II -10 10
(10%) 1980 478946 423354 O.Oe7 127451 7 II -7 5
1981 460804 474637 0.086 II3143 6 II -9 6
1982 417028 512750 0.103 lOIS II 6 12 -10 7
120% 1979 477732 384301 0.083 108505 20 22 -18 21
(20%) 1980 SII526 463715 0.080 133948 IS 21 -IS II
1981 487615 521720 0.080 II9927 12 22 -IS 13
1982 439259 566490 0.095 107868 II 23 -17 13
130% 1979 517543 418431 0.076 II7839 30 32 -25 31
(30%) 1980 544107 504065 0.074 140447 22 32 -21 16
1981 514403 568792 0.075 126702 19 33 -20 19
1982 461515 620190 0.088 II4189 17 35 -23 20