Sampling gear selectivity and its effect on estimates of mean length at age
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- Symposium proceedings 
Using data fiom the Norwegian bottorn trawl surveys in the Barents Sea in February ( 1989- 1996), the International O-group surveys in the Barents Sea (1 985-1 996) and previously estimaied selectivity for the standard Norwegian sampling gears, effects on estimates of mean length and weight at age are shown. For the younger fish rnean lengths at age are biased upwards, the relative bias increasing with decreasing size.
Gear selection and sampling gears. Proceedings of the seventh IMR-PINRO Symposium. Murmansk, 23-24 June 1997.