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- Title
Reliability of stock size estimates from adaptive framework virtual population analysis.
- Authors
Hiramatsu, Kazuhiko; Tanaka, Eiji
- Abstract
The stock size estimates from adaptive framework virtual population analysis are sometimes very sensitive to the model's assumptions. The uniqueness and precision of stock size estimates from adaptive framework virtual population analysis are examined analytically and numerically. The results indicate that (i) when the fishing mortalities remain constant for all years, the stock size estimates are not determined uniquely without additional assumptions, and (ii) when the cumulative fishing mortalities are similar among cohorts, the precision of stock size estimates will be poor, even if the abundance indices are precise and informative. For the precise estimation of stock size, it is necessary that fishing mortalities vary among years, that cumulative fishing mortalities vary among cohorts and that auxiliary information such as selectivity is available in addition to precise abundance indices.
- Subjects
FISH mortality; FISHERIES; FISHING; AQUATIC animals; FISHES; ICHTHYOLOGY
- Publication
Fisheries Science, 2004, Vol 70, Issue 6, p1003
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1111/j.1444-2906.2004.00900.x