Variability in abundance of Atlantic redfish derived from Canadian summer groundfish surveys on the Scotian Shelf (1970-1979) / Douglas Clay.: Fs70-8/80-31E-PDF

"Redfish (Sebastes marinus mentella) were shown to have had a variable catch history ranging from 84,000 tonnes in 1951 to 12,000 tonnes in 1979. Abundance (or catch rate) was affected by depth with peaks in catch rate at 150, 250 and 350 meters; by bottom temperature with a peak of 6°C; and by time of day with peaks at 1200 and 2130 hrs. Length frequencies from research vessel catches show small fish (<15 cm) to be very rare, although present in occasional catches (indicating their catchability). this lack of apparent recruitment over the last decade and the dependence of the fishery on 1 or 2 age groups (+30% of catch made up of 15 and/or 16 year olds) indicates an unhealthy fishery which requires careful management. A summary of 10 years of R/V survey data is provided"--Abstract.

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