Commercial Clam Production, Completion Report, October 1, 1979 to December 31, 1981

Identification Information

Citation

Originator: Gaumer, Thomas F. and Richard M. Starr

Publish Date: March 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: We completed our assessment of commercial clam harvest potential in Tillamook, Yaquina and Coos bays. All three bays contained commercial quantities of clams. Detailed studies in Yaquina Bay in 1981 revealed a biomass estimate of 2.6 million pounds (1,179.1 mt) of gaper clams (Tresus aapax) in the study tract. Our studies showed strong recruitment and survival of gaper set in 1975. Since then survival of set ha.s been negligible. Estimates of instantaneous rates of natural mortality for eight gaper clam cohorts ranged from 0.12 to 0.89. The experimental commercial clam harvest in Oregon was entirely in Coos Bay during 1980 and 1981. Poor market conditions eliminated the fishery from Yaquina Bay. Pump harvesters reported a catch per hour of effort of 432 pounds/hr (196 kg/hr), nearly twice the harvest rate of jet harvesters. The effects of harvest on recruitment and habitat were evaluated. Analysis of variance revealed that densities of only two species of clams (littlenecks and macomas), and amphipods and anemones were significantly different in the treatment and control sites at the 95% confidence level. Sediments in post-harvested areas showed a significantly higher percentage of coarse material at the 95% confidence level.

Purpose:

Time Period of Content: October 1, 1979 to December 31, 1981

Geographic Extent: Tillamook, Yaquina and Coos bays.

Status: Final

Use Constraints:

Format: PDF file

Data Quality Information

Lineage-Source:

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	31184
Year	1981
Publisher
Request Type	Completion Report
Location	Salem HQ
Date Created	1982 March
Date Cataloged	10/18/2007
Date Published	1982
Type	stp crnr
Pages	1-16
Volume
Status	2
Descriptor	Commercial Clam Production | Completion Report
Date Entered	2007-10-18 13:07:08
Location In Clackamas Library	Clams, N1E
Author	Thomas Gaumer; Richard Starr
Duplicates	0
Number Remaining After Requests	1
Presumed All Distributed
Back Room Duplicates	0
Author
Risk
Species
Disposition Of Requests	Tony DAndrea: Request filled

Is a physical copy maintained for reference at Headquarters? Yes