This report summarizes the results of crab studies undertaken during the fall of 1957 and 1958 in the Columbia River estuary. The purpose of this project was to determine the shell condition of the crabs available in this area during the period when crab fishing is prohibited in the ocean,...
Heart rates and amplitudes were measured for both intact
animals (in situ) and isolated hearts (in vitro) of the Dungeness crab,
Cancer magister, exposed to low levels in oxygen. Recordings were
also made of gill ventilation rate by measuring the frequency of
scaphognathite (gill bailer) beats.
Both the in vitro...
The behavior of the shore crab Hemigrapsus oregonensis was assessed
with and without exposure to polychlorinated biphenyls (Aroclor 1260).
After describing the crab's behavioral repertoire, activity budgets were
developed from observations of the time crabs spent in 20 categories of
shelter use, posture, and activity while held in habitat replicas...
The purpose of this study is to describe Dungeness crab marketing
from the ocean floor to the ultimate consumer; to identify
relations among the Oregon Dungeness crab industry, the Pacific
Coast Dungeness crab industry, and the Alaska King crab industry;
and to specify the relationships between fishermen's prices for
Dungeness...
The purpose of this study is to describe Dungeness crab marketing
from the ocean floor to the ultimate consumer; to identify
relations among the Oregon Dungeness crab industry, the Pacific
Coast Dungeness crab industry, and the Alaska King crab industry;
and to specify the relationships between fishermen's prices for
Dungeness...
Dungeness crab is an important fishery on the Pacific Coast.
The processing subsystem of the fishery is hampered by a variety of
problems that have acted to impede technological innovations that
could improve efficiency and sanitation in seafood plants. This paper
provides background for problems encountered by the processors, discusses...
The design and testing of a portable pumping system for use in
the hydraulic excavation of commercial crab pots buried by ocean
sediment was undertaken. The resulting portable system retained the
four major components of the pumping systems presently used by
commercial fishermen: engine, pump, fire hose, and nozzle. Because...
The Dungeness crab fishery is the largest and oldest known
shellfish fishery of the North Pacific coast of North America. The
stability and development of this fishery is seriously hampered by
increasing meat extraction costs and labor shortages.
Alternative solutions to offset the increasing costs and labor
shortages include: 1)...
The design of a more efficient waterjet system for excavation of
commercial crab pots buried in ocean sediment was undertaken. The
work resulted in the design of an improved nozzle with performance
that was shown to be significantly better than that of previously used
nozzles. Greater sand penetration and excavation...
The power spectral density of the acoustic signature of
Dungeness crab was calculated by the use of digital computer.
The signal produced by the Dungeness crab was an analog signal.
Therefore a conversion of the signal from analog to digital was
necessary. This was done by sampling the acoustic signature...