Data from the coho salmon migration were examined from three streams of the Alsea Watershed Study, conducted on tributaries to Drift Creek, Oregon, from 1959 through 1973. With the migration season defined as November 1 through May 31, the mean seasonal smolt count was 2022 fish in Deer Creek, 665...
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),...
Phenotypic similarities of coho salmon (Oncorhynchus kisutch)
stocks from Oregon, Washington, and California were compared using
agglomerative and divisive cluster analyses. The phenotypic characters
evaluated included the following: 1) the isozyme gene frequencies
of transferrin and phosphoglucose isomerase; 2) the life history
characters time of peak spawning and proportion of...
The effects of disking, food plantings, and wheat plantings on a population of California quail (Lophortyx californicus) were studied from fall 1976 to spring 1978 on the E.E. Wilson Wildlife Area, Oregon. Twelve 16.2-ha study sites were established: 3 study sites for each treatment and 3 control sites. Disked areas,...
Damage by Belding's ground squirrel (Spermophilus beldingi) to alfalfa (Medicago sativa) and the efficacies of various poisoning regimes to reduce damage were evaluated during March-July, 1976
and 1977. Regimes examined were designed to measure the effect of 3 variables on damage to alfalfa caused by squirrels including; timing of application,...
Species interactions and their effect on the use of habitat by benthic fishes were examined in a guild composed of Cottus perplexus, C. rhotheus, and C. beldingi in the Marys River above Philomath, Oregon, and in a constant environment provided by an artificial stream. In the Marys River system, the...
Two hundred thirteen mammals were captured on two study areas
between April 1976 and August 1977. Samples of urine and kidney tissue
from 202 mammals were cultured on media suitable for leptospiral growth.
Leptospiral organisms were not isolated from tissue cultures. Sera
from 88 mammals were examined by the microscopic...
A fish sampling program was initiated at Cottage Grove Reservoir
in June of 1974 to investigate mercury accumulation in the fish.
Samples were collected periodicallv from June to November, 1974, and
from June, 1975 through January, 1976 from both the reservoir and its
tributaries. Species collected included spring chinook salmon...
Oregon Department of Fish and Wildlife trout broodstocks from Alsea, Cole Rivers, Klamath, Leaburg, Oak Springs, Roaring River and Willamette Fish Hatcheries were examined for the presence of myxosporidans. Wild fish collected from waters above these hatcheries were also examined. Seven species of myxosporidans were observed in the hatchery broodfish:...
Eight scale characters of known hatchery and wild coho salmon
(Oncorhynchus kisutch) were compared, and a linear discriminant
function was used to determine if hatchery and wild adult coho
salmon could be correctly identified by their scales. Eighty-two
percent of the hatchery and 89% of the wild fish were correctly...
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 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...
A herd of re-introduced California bighorn sheep (Ovis canadensis
californiana) was studied from 15 June 1976 to 31 August 1977.
Thirteen major and seven minor habitats were delineated and described.
Habitat use by bighorns was observed throughout the study and
a habitat preference value (H.P.V.) was calculated based on use...
Short-term effects of 3 grazing systems and prescribed burning on bobwhite (Colinus virginianus) populations were investigated on the Welder Wildlife Refuge near Corpus Christi, Texas, during spring (April through June) and fall (September through October) of 1976 and 1977. Two rotational systems, high intensity-low frequency (HILF) and four-pasture, deferred-rotation (4PDR),...
A small mammal inventory of occurrence and relative abundance was conducted in riparian and upland habitats in six segments along the lower Columbia River from the river mouth to McNary Dam (river mile 292) during 1974 and 1975 by removal trapping on standardized trap lines. Analysis of variance was used...
Efforts to manage stocks of salmonids in Pacific Northwest stream systems are complicated by the occurrence of several runs of a species thought to represent races rearing sympatrically as juveniles. In order to collect the population statistics needed to properly manage these stocks, managers need a method of identifying juvenile...
Juvenile coho salmon (Oncorhynchus kisutch) and steelhead trout
(Salmo gairdneri) of different stocks and three transferrin genotypes
(AA, AC, and CC), all reared in identical or similar environments, were
experimentally infected with the causative agent of bacterial kidney
disease (BKD) or Vibrio anguillarum. Mortality due to the pathogens
was compared...
Models were developed that described cohort strength of female
Dover sole (Microstomus pacificus) and female English sole (Parophrys
vetulus) in stocks off the Columbia River as functions of environmental
variables. The environmental variables considered were those
that could hypothetically influence spawning success or survival.
They included a spawning power index,...
A trawling survey was conducted on Nyanza Gulf, Lake
Victoria, East Africa during March-December 1975 to investigate
association and distribution of the major fish species
and to provide information for management of the fishery.
A total of 139 sites was sampled and all fishes caught were
counted, measured, and weighed....
I investigated changes in plasma cortisol concentration over time in juvenile salmonids subjected to various stressors that might be encountered in their normal life cycle. This work was directed at finding a general indicator for stress in fish that could be used be used to aid fisheries research and management....
Mean weights, lengths, and condition factors of three isozyme
phenotypes of lactate dehydrogenase (LDH) enzyme differed significantly
for experimentally reared winter steelhead trout (Salmo
gairdneri) fry. Time of emergence from the gravel was unrelated
to LDH phenotype. Relative mortality of the phenotypes between
eyed-egg stage and emergence was unaffected by...
Pronghorn (Antilocapra americana) use of four playas (intermittent lakebeds) on Hart Mountain National Antelope Refuge (NAR) in south central Oregon was studied during the summers of 1974 and
1975. Percent canopy cover of playa vegetation, plant phenology, percent desiccated vegetation, soil moisture, available surface water and pronghorn use of range...
The performances of newly-established gravel incubation systems designed to use unfiltered water for production of unfed salmon fry were evaluated at Netarts Bay, Oregon, and at Little Port Walter, Alaska.
Research was divided into two phases. The first consisted of laboratory studies to develop fry quality testing procedures and to...
The occurrence of band-tailed pigeons (Columba fasciata) three mineral sites in Western Oregon was studied during the summers of 1974-1976. Objectives of the study were o: determine seasonal patterns of utilization of mineral sites by pigeons of different sex and age classes; determine productivity of pigeon populations associated with Mineral...
The metabolism of malathion in vivo was studied by injection of adult male Dungeness crab, Cancer magister, with 0.75 [mu]g/g wet weight [³H] malathion. At selected times within 24 hours of injection, subsamples of three crabs were taken for analysis of malathion and metabolites. Malathion was extensively activated by oxidative...
Effects of inbreeding coho salmon (Oncorhynchus kisutch) on
survival during early life history, growth, feed efficiency, and
resistance to gas bubble disease were studied. No effect of inbreeding
could be associated with either F=0.25 or F=0.125. Tetraploidy
may help explain the absence of inbreeding depression at these
levels.