Oregon Bay Clam Distribution, Abundance, Planting Sites and Effects of Harvest, Annual Report October 1, 1978 to September 30, 1979

Identification Information

Citation

Originator: Gaumer, Thomas F., Gregory P. Robart, and Anne Geiger

Publish Date: 1979

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 continued our studies of the distribution of bay clams in Oregon's estuaries. Maps showing the distribution of clams and vegetation type in Umpqua and Coos bays are presented. Population and biomass estimates, age and size of clams were calculated for an area in Yaquina Bay having commercial harvest potential. The data revealed that the 1975 year class remained strong for gaper clams. Approximately 3.5 million pounds (1,570 m.t.) of gapers were estimated for the area and a harvest quota of 200,000 pounds (90.7 m.t.) was established. During 1979, 74,565 pounds (33.8 m.t.) of clams were harvested in Yaquina Bay. Of this total, 73,959 pounds (33.5 m.t.) or 99.2% were gaper clams; the remainder were butter clams. Harvesters averaged 593 pounds/hr (269.5 kg/hr). In Coos Bay 13,901 pounds (6.3 m.t.) of clams were harvested. Production figures showed that 286.6 pounds/hr (130.3 kg/hr) were taken. Post harvest surveys showed no significant difference in numbers of clam set settling out in the treatment areas and control sites. Analysis of effects of harvest on sediment sizes showed, at the 95% confidence level, significantly higher percentages of coarse material in the treatment plot following harvest. Fine sand was significantly lower in the harvested area. We continued to monitor the growth of laboratory produced clams planted in Netarts and Yaquina bays.

Purpose:

Time Period of Content: October 1, 1978 to September 30, 1979

Geographic Extent: Umpqua, Coos, Yaquina and Netarts bays

Status: Final

Use Constraints:

Format: PDF

Data Quality Information

Lineage-Source: National Marine Fisheries Service National Oceanic and Atmospheric Administration United States Department of Commerce Commercial Fisheries Research and Development Act Project Number 1-122-R Segment 3 Contract Number 9-MO2-0RAC

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	28545
Year	1979
Publisher
Request Type	Annual Progress Report
Location	Salem HQ
Date Created	1979
Date Cataloged	10/2/2007
Date Published	1979
Type	stp crnr
Pages	1/4"
Volume
Status	2
Descriptor	Oregon Bay Clam Distribution, Abundance, Planting Sites and Effects of Harvest | Annual Report
Date Entered	2007-10-02 08:12:10
Location In Clackamas Library	clams, N1E
Author	Thomas F Gaumer; Gregory P Robart; Anne Geiger
Duplicates	0
Number Remaining After Requests
Presumed All Distributed
Back Room Duplicates	0
Author
Risk
Species
Disposition Of Requests

Is a physical copy maintained for reference at Headquarters? Unknown