Technical Report
 

Study on the vertical distribution and movement of pink shrimp, Pandalus jordani, in the Pacific Ocean off Oregon

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https://ir.library.oregonstate.edu/concern/technical_reports/j9602151t

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Abstract
  • Research cruises were made between August 28, 1967, and June 19, 1968, to study the vertical distribution and movements of pink shrimp, Pandalus jordani, off Tillamook Head in 68-80 fathoms. Shrimp traps suspended from surface to bottom, midwater trawl, and bottom shrimp trawl nets were used. Results are discussed in general terms and problems encountered are described. Shrimp were found to migrate off bottom rapidly at night. No apparent correlation between moon phase and migration was indicated. Data on moon phase-migration pattern are limited, however, due to weather and/or cloudy conditions. Seasonal d5fferences in vertical migration in the study area (sex composition and height of migration) were indicated, probably due to (1) sex segregation and 2) presence or absence of thermocline. Few shrimp were caught in pots during May and June 1968, possibly due to a change in feeding habits. Differences in sex composition of catches in pots and midwater trawl indicate the pots are probably biased toward catching females. These data await detailed analysis. Results will appear in a final report on this study next year.
  • "Commercial Fisheries Research and Development Act: Progress Report" at head of title page. 12 p.
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  • Digitized at 300 dpi with OCR on a Ricoh IS760D, Fall, 2010, by ODFW employees.
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