Results of a 1988 trawl survey of groundfish resources of the upper continental slope off Oregon

Abstract

The Alaska Fisheries Science Center (AFSC), in cooperation with the Southwest Fisheries science Center (SWFSC), conducted a bottom trawl survey of groundfish on the upper continental slope off Oregon during November-December 1988. The survey area was between 44°06' N lat. (Heceta Head) and 45°22' N lat. (near Cape Lookout) between the depths of 183 and 1,280 m (100 and 700 fm). Sampling was conducted aboard the NOAA ship Miller Freeman and included standard bottom trawl hauls, neuston net tows, standard and deep oblique plankton net tows, and physical oceanographic observations from 62 predetermined stations. This report explains the sampling and analytical methods used and summarizes the results of the bottom trawl survey. The report presents environmental data, species composition, distribution, and relative abundances of major species of fish. Biomass, population, and size composition estimates are presented for the survey target species by depth stratum. Estimates are presented in less detail for other species. Appendices include a trawl mensuration report, position and catch listings for each haul, catch rates of fish by depth stratum, population and biomass estimates for principal species, and population size compositions.


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