Exploratory bottom trawling for sablefish southwest of Vancouver Island, 1978 / by N. Sigmund, R.J. Beamish, J. Fargo, G. Kingston and M. Stocker.: Fs97-4/1517E-PDF

"A moderate catch rate of 668 kg/hr of sablefish was obtained but large incidental catches of Pacific ocean perch (1521 kg/hr) and turbot (453 kg/hr) were also obtained. Because of this high incidental catch, any trawl fishing for sablefish in the study area would have to be closely monitored if catch quotas existed for any of these incidental species. The modal age for male sablefish was 6 yr and 8 yr for females. Few males older than 8 yr were found but 41% of the females were older than 8 yr. However, age determinations using the whole otolith are very difficult and it is quite probable that ages are being underestimated especially for males. Pacific ocean perch ranged in length from 22 to 49 cm and in age from 7 to 28 yr. The number of fish in each age class was similar to a sample collected in 1968 except that the modal age of this sample was 13 yr compared to a modal age of 15 yr in the 1968 sample. In a separate study it was found that ages of Pacific ocean perch may be underestimated for fish over 22 yr old, unless otolith sections are examined"--Abstract, page iii.

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