Biliary excretion has been of considerable interest in mammals
but has not been extensively studied in fish. To understand the
significance of biliary excretion in rainbow trout (Salmo gairdneri),
two studies were conducted.
The objective of the initial study was to evaluate the ability of
rainbow trout to excrete a...
In the upper estuary of Yaquina Bay, Oregon, there is an annual
population explosion of Acartia tonsa, (Dana) a calanoid copepod,
during the months of July, August and September, followed by a rapid
decline to virtual extinction in November. The restricted estuarine
distribution affords an excellent opportunity to study the...
The life cycle of Callianassa californiensis Dana, 1854, was
studied in the tidal estuary, Yaquina Bay, Oregon. At this latitude
it is largely restricted to intertidal sandy mudflats under predominately
marine influence. Salinity and temperature appear to determine
its distribution to a greater extent than does sediment type.
Vertical movement...
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...
Osmotic and ionic regulation was studied in the Dungeness
crab, Cancer magister, after acute exposure to a range of five
salinities from 25% to 125% sea water (100% = 32%). Blood, urine
and muscle tissue were sampled at 24 and 48 hours after exposure.
Analyses were made of blood and...
This document, an internal discussion paper for the Oregon Fish Commission, reviews the production levels and management of the Oregon Dungeness crab fishery. Topics covered include minimum size, the ban on taking female crabs, escape ports, crabbing seasons, inability to predict the recreational take, crab culture, and recommendations. The report...
This paper is an attempt to summarize our actual knowledge about the marine resources available in the area. It also analyzes the situation of the fishery and the principal aspects involved in a possible plan for an integral fisheries development of the Oceanic region around the islands. This plan could...
Callianassa californiensis (Dana), a burrowing crustacean
inhabitant of estuarine mudflats along the Pacific coast, is subjected
to severely hypoxic interstitial water twice each tidal
cycle.
A preliminary approach was made to understanding the metabolic
mechanisms employed by Callianassa during periods of anoxic stress.
Percent glycogen in the hepatopancreas and chela...