During eleven cruises conducted off the Oregon continental
slope from April 1973 to March 1975, approximately 1600 specimens
of the majid crab Chionoecetes tanneri Rathbun were collected.
A time sequence of size frequency histograms and bivariate plots of
allometric measurements were used to determine size classes,
population structure, growth and...
Bimonthly plankton samples were collected from 1969 through
1971 along a transect off the central Oregon continental shelf (44°
39. l'N) to document the species of crab larvae present, their seasonality,
and their onshore-offshore distribution in relation to seasonal
changes in oceanographic conditions. A comprehensive key with
plates is given...
The claw shuddering display of the shore crab Hemigrapsus oregonensis was explored with acoustic and behavioral observations. Male H.
oreqonensis stridulate during claw shuddering display. The stridulatory apparatus is present only on the males. The acoustic signal was of brief duration, showed a general pattern of sound bursts, but varied...
The Hemigrapsus oregonensis population at Coquille Point in
the Yaquina Bay Estuary on the Central Oregon Coast was studied
from April, 1972 through May, 1973. The population was found to be
vertically stratified from the 1 ft level to the 5 ft level. Population
densities were found to be most...
In 1974, large numbers of Dungeness crabs migrated into tide pools near the South Jetty of Yaquina Bay and went through their annual molt. The public discovered the abundance of crabs, and found that they were easy prey during low tides. The situation prompted an emergency closure of the area...
Results of studies beginning in 1947 on the biology of the Dungeness crab (Cancer magister) in Oregon coastal waters are reported. A review is made of the history of the fishery with regard to trend of the catch by magnitude, area, and season; the development and conduct of the fishery...
"The Shellfish Investigation samples the crab catch along the Oregon coast each year for shell condition as an index to meat yield and suitability of season opening dates. In addition to sampling for condition, a number of animals are sampled for width frequencies to determine the mean size of crabs...
