Controlled Rearing of Dungeness Crab Larvae and the Influence of Environmental Conditions on their Survival, Annual Report July 1, 1969 to June 30, 1970

Identification Information

Citation

Originator: Gaumer, Thomas F.

Publish Date: 1970

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: Dungeness crab larvae, when reared at different larval concentrations of 5, 10, 20, and 40 per 200 ml of water, exhibited no optimum larval density although survival was generally highest at 5 per ml. Times of molting were generally similar at each larval concentration. Average size of megalopae at 5 and 10 larvae per flask was 8.0 and 8.1 mm in length, respectively. Tests showed that the zoeal stages of Dungeness crab react differently to light. Generally the response was positive by all but the fourth stage zoeae. Zoeae and laboratory reared megalopae displayed a positive phototropism at 25 and 340 ft-c and a negative response at 990 ft-c. Interaction between zoeal stages and light intensities was not significant. Dungeness crab zoeae generally exhibited no positive rheotaxis at a velocity of 33.8 mm/second. Laboratory reared megalopae swam slowly while wild megalopae swam actively in the swimming chamber. Post larvae crabs preferred a sand bottom over a gravel bottom and rejected plexiglass and mud substrates.

Purpose:

Time Period of Content: July 1, 1969 to June 30, 1970

Geographic Extent: Not Available

Status: Final

Use Constraints:

Format: PDF

Data Quality Information

Lineage-Source: U.S. Department of the Interior Fish and Wildlife Service Bureau of Commercial Fisheries Commercial Fisheries Research and Development Act Subproject l-5-R-5 Contract No. 14-17-0001-2131

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	1016
Year	1970
Publisher
Request Type	Annual Report
Location	Coast, OR
Date Created
Date Cataloged	2/16/2001 14:24:24
Date Published	1970
Type
Pages	1-13
Volume
Status	0
Descriptor	Dungeness Crab Larvae; Harvest; Coast, OR
Date Entered	1/1/1999
Location In Clackamas Library
Author
Duplicates
Number Remaining After Requests
Presumed All Distributed
Back Room Duplicates
Author	Gaumer, T.F.
Risk	Harvest
Species
Disposition Of Requests	Tony D'Andrea: Requested, but no copies available

Is a physical copy maintained for reference at Headquarters? Unknown