Seasonal changes in English sole distribution : an analysis of the inshore trawl fishery off Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/zk51vm102

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Oregon English sole catch data from 0 to 80 fathoms between Coos Bay and Cape Lookout were examined for the years 1973, 1975, and 1976. English sole is a major target species of this inshore trawl fishery. Comparison of depths of maximal values of catch per unit effort, effort, and total English sole landings for each month was used to determine when effort in this mixed-species fishery was directed on English sole. Petrale sole, normally a deeper water species, move inshore during late spring and summer months and may be a primary target during this season. Dover sole appeared to be a target species during certain spring months but rarely overshadowed either English or petrale sole catches. External factors such as weather conditions and market variability affected total monthly effort levels and were included in an interpretation of seasonal abundance and migration trends of English sole. Longshore movements were largely obscured by the month-to-month fluctuations of effort from Newport and Coos Bay, the two major fishing ports within the defined landing area. The Newport fleet is somewhat larger, but variable weather conditions may result in greater effort on the part of the Coos Bay fleet during certain months. Seasonal inshore-off shore movements of English sole, however, were consistently evident for the three years. Average depths of capture and catch per effort increased during fall and early winter months suggesting movement into deep water. Examination of ovary condition of English sole caught in the vicinity of Heceta and Stonewall Banks off the central Oregon coast linked this concentration and offshore movement to spawning. Inshore movement and decreased landings in the spring suggested a post-spawning dispersal.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2012-03-07T23:15:59Z (GMT). No. of bitstreams: 1 HewittGaryR1980.pdf: 1093511 bytes, checksum: 7b87ab76355671103586f8e9716286c4 (MD5) Previous issue date: 1980-02-20
  • description.provenance : Submitted by Sergio Trujillo (jstscanner@gmail.com) on 2012-03-07T01:41:14Z No. of bitstreams: 1 HewittGaryR1980.pdf: 1093511 bytes, checksum: 7b87ab76355671103586f8e9716286c4 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-03-07T23:15:59Z (GMT) No. of bitstreams: 1 HewittGaryR1980.pdf: 1093511 bytes, checksum: 7b87ab76355671103586f8e9716286c4 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-03-07T23:13:47Z (GMT) No. of bitstreams: 1 HewittGaryR1980.pdf: 1093511 bytes, checksum: 7b87ab76355671103586f8e9716286c4 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items