A method for predicting the harvest of commercial Dungeness
crab (Cancer magister) one year in advance of the fishing season is
described. The technique is based on the hypothesis that the relative
abundance of sub-legal crabs one year is directly proportional to the
harvest of legal crabs the following year....
Methods and utility of age determination of yellowtail rockfish
(Sebastes flavidus), canary rockfish (Sebastes pinniger), and black
rockfish (Sebastes melanops) collected off Oregon during 1972 to
1975 are discussed. Structures compared on the basis of the reproducibility
of counts of annuli (consistency of readings) were the anal fin
pterygiophore, opercle,...
The distribution and trophic ecology of neritic reef fishes was
studied to provide biological information useful in conserving these
stocks. Houk and line fishing was conducted from July 1976 to July
1977 on neritic reefs within 5 km of the Oregon coast adjacent to
Depoe Bay. Sampling was designed to...
The results of research designed to develop a synthesized diet
as a substitute or supplement to algae for culturing the Miyagi strain
of juvenile Pacific oysters, Crassostrea gigas (Thunberg) are
reported. The growth of juvenile Pacific oysters fed equal amounts
(based on ash free dry weights [AFDW]) of algae (Pseudoisochrysis...
The sample ratio of sublegal to legal male crabs retained in crab
pots was used in calculations to predict future harvest of Dungeness
crabs, Cancer magister, along the Oregon coast. Accurate predictions
by this method require a sample ratio representative of the population
ratio. I sampled the Oregon Dungeness crab...
Samples of weathervane scallops taken on Oregon Department of
Fish and Wildlife cruises off Oregon waters during 1981-1982 were
analyzed for a comparative growth study. No evidence of internal
growth marks were found in the shell structure when analyzed by the
acetate peel technique. Internal growth lines formed in the...
An analysis was conducted to estimate the minimum mesh
size for managing the common Chilean hake (Merluccius gayi)
fishery. Secondary objectives were to establish the
selective relationship between mesh size and fish length,
to examine growth patterns and related parameters, and to
estimate the critical age (or optimum size) at...
Data were gathered on the life history of the pile perch
(Rhacochilus vacca) from Yaquina Bay, Oregon, between April,
1966, and July, 1967. Pile perch feed on the bottom and consume
mostly molluscs, barnacles and decapod crustaceans. Food habits
varied among seasons and locations within the bay, whereas the
diet...
Data are presented on the life history of snake
pricklebacks, Lumpenus sagitta, collected in Yaquina Bay,
Oregon, from June 1977 to October 1978. Specimens were
collected primarily by beach seine from four sampling sites
in the bay. Snake pricklebacks feed on algae (mainly genus
Enteromorpha), on polychaeta (mainly genus Neoamphitrite),...