Rockfish Assessment Studies on Heceta Bank, Oregon, 1980 - 1981, Sub-project Annual Report, October 1, 1980 to March 1, 1982

Identification Information

Citation

Originator: Johnson, Steven L., William H. Barss, and Robert L. Demory

Publish Date: 1982

Online Link: None

BPA Project #:

Contact Information

Agency: Oregon Department of Fish and Wildlife

Name: Cedric Cooney

Job Position: Natural Resources Data and Systems Manager

Telephone: 503-947-6094

E-Mail Address: Cedric.X.Cooney@odfw.oregon.gov

Description

Abstract: From January 1980 to January 1981 approximate monthly sampling of a unique rockfish (Scorpaenidae) fishing area on Heceta Bank, Oregon was undertaken using acoustic techniques and trawling aboard chartered commercial fishing vessels. Rankings of density of fish sign observed on acoustic transects were regressed against selected environmental variables. Acoustic abundance results showed no seasonal fluctuations nor were abundance ratings correlated to time of day. A significant correlation was obtained between rockfish abundance and feed abundance. Although regressions of acoustic estimates were significant each of the principal variables of weekly upwelling index, secchi depth, time of day, barometric pressure, feed abundance and tide fluctuations accounted for only a small part of the variance. A relationship between trawl catch rate (lb/hr) and season or time of day was not observed. Catch rates were correlated with bottom temperature, maximum tide change and tide change during the tow. Quarterly biomass estimates calculated by the area-swept method varied as much as 20-fold. We concluded that the method of ranking abundance based on acoustic signals was unsuccessful. More importantly we were unable to predict conditions during which canary rockfish (Sebastess pinniger) were available to trawlable areas.

Purpose:

Time Period of Content: 1980-1981

Geographic Extent: Heceta Bank

Status: Final

Use Constraints:

Format: PDF

Data Quality Information

Lineage-Source: National Marine Fisheries Service National Oceanic and Atmospheric Administration U.S. Department of Commerce Commercial Fisheries Research and Development Act Project No. 1-151-R-2 Contract No. 81-ABD-ORAC

Data Information

No data information was supplied.

Entity and Attribute Information

Attributes Description: Field attribute information is available in the attached file(s).

Bibliography Information

Field Name	Value
Biblio ID	4379
Year	1981
Publisher
Request Type	Report (Annual)
Location	Salem HQ
Date Created	1982 May
Date Cataloged	4/24/2007
Date Published	1982
Type	stp crnr
Pages	1-22
Volume
Status	2
Descriptor	Heceta Bank, OREGON; Rockfish
Date Entered	2007-04-24 00:00:00
Location In Clackamas Library	N2W Ocean fish
Author	Steven L Johnson; William Barss; Robert Demory
Duplicates	0
Number Remaining After Requests
Presumed All Distributed
Back Room Duplicates	0
Author	Barss, J.M.; Demory, R.L.; Johnson, S.L.
Risk
Species
Disposition Of Requests	Jean McCrae - 2: Requested, but no copies available
Disposition Of Requests	State Archive: Request filled
Disposition Of Requests	StreamNet Library: Requested, but no copies available

Is a physical copy maintained for reference at Headquarters? Unknown