Shelf rockfish assessment for 1998 and recommended yield options for 1999 / R. Stanley. : Fs70-1/1999-53E-PDF

Interim assessments are provided for silvergray, widow, yellowtail and canary rockfish. Harvest recommendations for all stocks are unchanged from last year. Stock assessment research in 1998 focused on acoustic biomass estimation of mid-winter aggregation of widow rockfish. The mid-winter aggregation near Triangle Island is well known to fishers. They suggested that the aggregation might, if estimated, be large enough to alter Department perceptions of harvest limits. A joint Fisheries and Oceans and Industry survey aboard the C.G.R.S. W.E. Ricker and Fishing Vessel Frosti was conducted in January-February 1998. The aggregation was surveyed 20 times with a maximum estimate of 2,000 t of widow rockfish. This biomass observation was not sufficient to alter current yield recommendations.

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