Fitzgerald, Jennifer,

Thesis (M.Sc.)--Memorial University of Newfoundland, 2000. / Bibliography: 92-95.

Spencer, Randall C.

Thesis (M.S.) in Zoology--University of Maine, 2009. / Includes vita. Includes bibliographical references (leaves 60-73).

Lans, Linnea

<p> </p><p>ABSTRACT</p><p> </p><p>Migration is common among populations of brown trout (Salmo trutta) and Atlantic salmon (Salmo salar). However, not all individuals in the same population migrate, a phenomenon referred to as partial migration. The aim of this thesis was to investigate if an individual’s behaviour and metabolic rate influences its decision to migrate and how such knowledge may be used when trying to produce hatchery-raised smolts with as high a proportion of migrating individual...

Beaty, Roy E.

The average size and age of chinook salmon (Oncorhynchus tshawytscha) caught in commercial fisheries along the Pacific Coast of North America have decreased substantially in this century. These declines might be caused in part by changes in size and age at maturity within the stocks contributing to those fisheries. Upriver Brights (Brights), a stock of fall chinook salmon in the Columbia River, are one of those stocks. The purposes of this study were to (1) determine if average size and age at m...

Trombley, Susanne

An up-regulation of gene expression of the gonadotropin receptors FSHR and LHR, and a down-regulation of anti-Müllerian hormone (AMH), in the gonads of early maturing male Atlantic salmon parr (Salmo salar) have been shown to take place during the process of sexual maturation. It has however not been determined if this happens prior to or after the onset of spermatogenesis. The aim of this study was to see if such an up-regulation of the gene expression of FSHR and LHR mRNA, and down-regulation ...

Chan, Judy Chuk Kwan

Six extruded dry diets formulated to contain one of two levels of digestible protein (37% or 44%) and one of three levels of digestible lipid (16%, 23%, or 30%) on a dry weight basis as well as a seventh commercial diet were used to feed triplicate groups of post-juvenile coho salmon (Oncorhynchus kisutch) in sea water. Fish were fed to satiation twice daily for 168 days beginning October, 1997. The performance of the fish was assessed by measuring changes in mean body weight (BW, g), mean ...

Thomas, Alison Carolyn

Astaxanthin (Ax) is the pigment responsible for the characteristic flesh colour of salmonids and must be present in the diet of farmed salmon in order for them to attain a colour acceptable to consumers. These studies were conducted to investigate the potential for early pigmentation in chinook salmon, to determine an effective dietary concentration of Ax for juvenile chinook, and to examine possible antioxidative activity of Ax in salmon fillets stored under aerobic and anaerobic condition...

Siemens, Beverly Ruth

Representative samples of post-juvenile Chinook salmon were obtained from the Department of Fisheries and Oceans Canada - West Vancouver Laboratory. The fish were part of a study directed to assessing the influence of two ration levels (75% and 100% of maximum ration) and three swimming speeds (0.5, 1.0, and 1.5 body lengths/second) on growth, body composition and thyroid function of chinook salmon in seawater. All analyses in the present study were conducted using cooked muscle. Sensory an...

Keen, Patricia Lynn

Recently, the scientific community has been concerned about the potential of exposing organisms to natural estrogens and xenobiotic compounds that can interfere with normal endocrine functions in these organisms. Indeed, over the past decade, it has been recognized that there is a need to conduct more research that involves studying the effects of exposure of organisms to endocrine disrupting compounds in order to understand their implications for human and ecosystem health. Accordingly, th...

Lonza, Carlos (Lonza Robledo)

Thesis (S.M. in Management of Technology)--Massachusetts Institute of Technology, Sloan School of Management, 2012. / Cataloged from PDF version of thesis.. / Includes bibliographical references (p. 73). / Salmon farming is one of Chile's main economic activities, as well as a major factor in the country's aquaculture sector, and critical to the economic growth strategies proposed by the government. Chilean salmon farming is ranked number two in the world, competing closely with Norway (number o...

Neuswanger, Jason

<p> Chinook salmon (<i>Oncorhynchus tshawytscha</i>) are critical to subsistence and commerce in the Yukon River basin, but several recent years of low abundance have forced devastating fishery closures and raised urgent questions about causes of the decline. The Chena River subpopulation in interior Alaska has experienced a decline similar to that of the broader population. To evaluate possible factors affecting Chena River Chinook salmon productivity, I analyzed both population data and the be...

Parker, David B .

Growth hormone-releasing hormone (GHRH) is a neuropeptide which stimulates the synthesis and release of growth hormone (GH) from the pituitary gland. The primary structure of this peptide has been identified in 7 mammalian species while the gene has been isolated from only rat and human. GHRH is a member of the glucagon superfamily which includes vasoactive intestinal peptide (VIP), glucagon, secretin, peptide histidine methionine (PHM), gastric inhibitory peptide (GIP) and a recently identified...

Vernerback, Claes

The global mean temperature is predicted to increase by up to 5 °C during this century. For fish, being ectotherms, temperature is one of the most important environmental factors, influencing them in a number of different ways, including effects on physiological traits, timing of life history events and behavior. Atlantic salmon has been shown to grow faster after being incubated at warmer temperatures. One possible explanation for this could be that the increased incubation temperature causes d...

Doson Coll, Yago

Sockeye salmon (Oncorhynchus nerka) populations in BC have undergone varying degrees of decline coinciding with a shift to a warmer phase of the Pacific Decadal Oscillation (PDO) in 1977. The PDO, and other climate cycles, have been shown to significantly affect the physical and biological characteristics of the North East Pacific Ocean. Changes in ocean productivity have implications for pelagic food webs and may cause shifts in the abundance of potential prey for sockeye salmon, impacting thei...

Nadeau, Patrick Sylvain

Pacific salmon (Oncorhynchus spp.) undergo arduous upstream migrations In order to spawn. To date, much scientific attention has focused on why certain migrants succeed in reaching their destination while others die trying. Less is known about how 'successful' spawners differ in the quality of the progeny they produce. Using sockeye salmon O. nerka (Walbaum) as a model, two artificial fertilization experiments were conducted to investigate the relationships between individual salmon and their of...

Swift, Bruce D.

Heritabilties and genetic correlations using Individual Animal Model, (IAM), analysis for weight, length and survivability were determined in both freshwater and saltwater rearing of s0 and si1 coho, (Oncorhynchus kisutch). The most important trait to salmon farmers is the saltwater market weight which was found to have heritability estimates of 0.21 and 0.45 for the s1 and s0 smolts. Estimates of heritability for survival were high, (0.29 and 0.21) for both s0 and s1 rearing strategies. Genetic...

Richardson, Nancy L.

In 1981 a severe cataract outbreak occurred in chinook and coho salmon stocks at several British Columbia and Washington State hatcheries. It was hypothesized that the cataracts resulted from a zinc deficiency due to high levels of dietary calcium and phosphorus in relation to zinc. This thesis, consisting of three experiments, was designed to investigate this possibility in juvenile chinook salmon. Experiments I (preliminary study) and III (comprehensive study) investigated the influence of wid...

Taylor, Eric Burke

Morphological comparison of ten populations of juvenile coho salmon, Oncorhynchus kisutch, from streams tributary to the Fraser River upstream of Hell's Gate and streams in the lower Fraser Valley and Strait of Georgia region suggested that coastal juveniles were more robust (deeper bodies and caudal peduncles, shorter heads and larger median fins) than interior juveniles. Discriminant function analysis indicated that juvenile coho could be identified as to river of origin with 71 percent accur...

Steigenberger, Lance W.

This study was aimed at providing information that could be used to estimate the predation effect of squawfish on sockeye salmon. Initial studies at Griffen Lake revealed that the percentage of the population acting as predators, and the average stomach volume, increased with increasing size in non-spawning squawfish. Squawfish in Griffen Lake appeared to be most active at night. For the most part, a force fed volume (2.0 ± .1 gms) was digested by all sizes of squawfish in less than 24 hours. ...

Rankin, David Paul

A two year study was initiated in 1973 to examine effects of substantial (3.8 fold; from a 1962-66 mean of 39 million to about 150 million in 1973 and 1974) increases in sockeye (Oncorhynchus nerka) Walbaum) fry numbers on zooplankton abundance in Babine Lake. Several lake areas and stationsware sampled for zooplankton bimonthly from May to October during 1973 and 1974 and compared to data gathered between 1958 and 1962 prior to a large scale enhancement program for sockeye stocks. Zooplankton b...

Allan , Gerald D.

Juvenile, pre-smolt coho salmon were subjected to a decrease in environmental temperature from 12°C (temperature of acclimation) to 2°C over a period of approximately 72 hours. During this time, plasma Cortisol values were estimated by the competitive protein binding (CPB) technique. In addition, an histometric analysis of the interrenal tissues of these fishes was performed as a measure of interregnal activity. Experimental results indicated that fluctuations in plasma Cortisol concentrations o...

Jokikokko, E. (Erkki)

Abstract Long-term monitoring of the wild salmon (Salmo salar L.) stock of the Simojoki river and the stocked hatchery-reared salmon parr and smolts has provided a considerable amount of information on the development of the stock and factors affecting it. Data on the relationships between wild and reared salmon were collected by tagging and trapping both smolts and adult salmon having either a wild or reared background. The tag recapture rate of wild smolts was about twice as high as that of sm...

Kim, Muriel

The longitudinal trend in the size of a river’s bed material is best represented as being composed of several discrete units, called sedimentary links, in which each sedimentary link is initiated by a source of coarse sediment, and the bed material becomes progressively finer in the downstream direction. In this study, the concept of sedimentary links is applied to salmon rivers in the Gaspé Peninsula of Quebec, Canada, which have previously not been studied in the context of sedimentary links. ...

Baumann, Michael

No description available.

Wieruszewski, Joanna Barbara

No description available.

Tucker, Strahan

No description available.

Footen, Brian.

Thesis (M.E.S.)--The Evergreen State College, 2001. / Title from title screen viewed (3/20/2008). Includes bibliographical references (leaves 41-44).

Maxwell, Marla Rae

No description available.

Mathias, Karin L.

No description available.

Palmisano, Aldo Nicholas.

Thesis (Ph. D.)--University of Washington, 1998. / Includes bibliographic references (leaves [97]-124).

Lamperti, Larry Phillip.

Thesis (M.S.)--Oregon State University, 1976. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Mesa, Matthew G.

Juvenile chinook salmon (Oncorhynchus tshawytscha) were experimentally infected with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), to investigate the effects of BKD on three aspects of juvenile salmonid performance: (1) predator avoidance ability; (2) smoltification; and (3) physiological responses to stress. For these experiments, fish with different Rs-infection profiles (created by using an immersion challenge method) were sampled to assess physiologi...

Marie, Amarisa

Wild populations of fish are faced with a multitude of stressors, which may include human interaction, toxins, and disease. Benzo(a)pyrene (BaP), a known carcinogen and immunotoxin, has been reported in the stomach contents of juvenile chinook salmon, Oncorhynchus tshawytscha, in urban waterways. We investigated the impact of chronic dietary exposure of environmentally relevant levels of BaP on the immune system and cytochrome P4501A1 (CYP1A1) expression in juvenile chinook salmon. Two experimen...

Jordan, Michelle S.

The freshwater polychaete Manayunkia speciosa was identified as an obligate host of the salmonid parasite Ceratomyxa shasta in 1997, prompting increased research on the small benthic invertebrate. Ceratomyxa shasta infection in fish can cause mortality, and presents a disease risk for both hatchery and wild salmon and trout. Ceratomyxa shasta is endemic to rivers of the Pacific Northwest, and its effects have been particularly well documented in the Klamath River, Oregon and California. One opti...

Evans, Paul L.

The Pacific Salmon Treaty was established by Canada and the United States to secure sustainability of salmon harvests within the Pacific Northwest. Renewed in June 1999, the treaty functions to legitimize and empower the Pacific Salmon Commission as the agent of fishery sustainability. The Pacific Salmon Commission serves as a bilateral recommendation-making body. Through its formal and informal, communications, the commission suggests action and defines regional salmon policy. Over the past dec...

Bendiksen, Eldar Åsgard

<p>The aim of this study was to investigate the effects of water temperature and salinity on lipid nutrition of farmed Atlantic salmon (<i>Salmo salar L</i>.) parr and smolt. Salmon parr were held at low water temperature (2°C) for six months while being fed feeds that differed in oil source (i.e. marine fish oil or vegetable oil blend) and concentration (low, 21% and high, 34%). The responses at low temperature were compared with those of fish held at 8°C using full-factorial design.</p><p>Feed...

Kassah, Jemimah Etornam

Biofouling has become a serious problem for farmers in the Norwegian finfish aquaculture industry in recent years; with the hydroid Ectopleura larynx dominating the fouling community in southwestern and mid-Norwegian waters. Most farmers in Norway use a combination of strategies to deal with fouling: the use of copper coated nets combined with washing, the use of copper coated nets combined with drying, and the use of uncoated nets combined with frequent washing. Concerns have been raised about...

Ogut, Hamdi

A series of experiments with Aeromonas salmonicida and infectious hematopoietic necrosis virus (IHNV) were carried out to determine dynamics of the spread of infection in chinook salmon (1.2-1.98g) and rainbow trout (1.2-3.1g). It was found in experiments with A. salmonicida that fish infected by bath immersion became infectious at 4 days postexposure (dpe), one day prior to dying from furunculosis. In cohabitation experiments with a single infected fish donor, an average of 75% disease specific...

Gunnarsdottir, Hugrun

This study was designed to provide information about the juvenile life history of coho salmon, Oncorhynchus kisutch, in the Tenmile Lakes in Oregon by 1) classifying scales of spawning fish and outgoing smolts (1+), 2) assessing the contribution of juvenile life history types to the returns of adults (3₂) and jacks (2₂), and 3) comparing growth rates and survival of different types. Scales of outmigrating smolts from one brood year, jacks from two brood years, and scales of adults from four broo...

Clark, Steven (Steven Michael)

The fitness of female Pacific salmon (Oncorhynchus spp.) with respect to breeding behavior can be partitioned into at least four components: survival to reproduction, competition for breeding sites, success of egg incubation, and suitability of the local environment near breeding sites for early rearing of juveniles. Accordingly, breeding sites should exhibit predictable habitat features linked to these components. In this study, I evaluated the relative influences of habitat features linked to ...

Davidson, Gary F.

Graduation date: 1991

Norrgård, Johnny R

Conservation and management of migratory salmonids requires an understanding of their ecology at multiple scales, and a holistic view, including assessment of historical and present anthropogenic impacts. In the regulated River Klarälven, with 11 hydropower dams, populations of landlocked Atlantic salmon Salmo salar and migratory brown trout Salmo trutta have declined due to human activities. Maintaining viable populations of salmon in the River Klarälven has high priority, given there are fewer...

紀思思, Kee, Francis.

published_or_final_version / Zoology / Master / Master of Philosophy

Butts, Christine A.

The life histories, behaviour, diet, habitat, and diurnal activity patterns of two species of Snares Island weta, Zealandrosandrus subantaraticus and Insulanovlectron spinosum, are presented. The males and females of Z. subantarcticus had 12 instars. The males of I. spinosum had 9 instars while the females had 10 instars. Eclosion, moulting, inter- and intraspecific interactions, oviposition, and cannabalism are described. The diet of both species included arthropods, plant material, and dead se...

Thomson, Catherine Ann

Loma salmonae is a microsporidian parasite that infects economically important Chinook salmon (Oncorhynchus tshawytscha) farmed in British Columbia, Canada. Here a variety of research efforts aimed at improving early detection and diagnostic tools, developing preventative strategies, and increasing understanding of the parasite/host interactions are presented. First, the development of chicken-derived polyclonal antibodies (IgY) specific for L. salmonae is described. These antibodies have proven...

Tucker, Strahan.

Through the 137Cs mass balance method, annual consumption rates were estimated for juvenile Atlantic salmon parr and precocious males, as well as brook trout from 4 sites within the Ste Marguerite river system, Quebec. With explicit age analysis, feeding rates and growth rates were derived on an individual fish and age class basis. These represent the first consumption estimates for Atlantic salmon in the wild. The individual fish approach provided a range of data for a single site, as opposed t...

Coulombe Pontbriand, Moise.

Although the watersheds of the Petite Cascapedia and Bonaventure Rivers, Gaspe Peninsula, have broadly similar geology and land use, their segment-scale river geomorphology is contrasted by subtle differences in valley characteristics that are a legacy of their individual geomorphic histories. These differences have consequences on the distribution of Atlantic salmon habitat such as boulder abundance (for parr rearing and overwintering habitats) and spawning substrate quality. Parr preference fo...

Schlicht, Alberto

Salmon farming is a flourishing aquaculture industry throughout the world and relies on intensive husbandry practices and well balanced diets to succeed. As in agriculture, genetics, health, husbandry, and nutrition are the main pillars of a successful and sustainable industry. Astaxanthin, a xanthophyll pigment with antioxidant properties, is incorporated into farmed salmon diets to provide the desirable red colour in flesh. Dietary antioxidant supplements (i.e. vitamins, flavonoids) have ...

Simpson, Samantha C.

<p> The Nushagak River, Bristol Bay, Alaska, supports one of the largest wild sockeye salmon (<i>Oncorhynchus nerka</i>) runs in the state and also supports overlapping runs of chum (<i>O. keta</i>) and Chinook (<i>O. tshawytscha</i>) salmon. Each summer, the Alaska Department of Fish and Game deploys dual-frequency identification sonar (DIDSON) on the river to enumerate salmon to monitor escapement goals; however, salmon behavior and spawning run characteristics at the site are not incorporated...

Pedersen, Stephanie

Mapping quantitative trait loci (QTL) for traits under consideration for genetic improvement is becoming more common for many aquatic species, including Atlantic salmon. The objective of the study was to map QTL associated with length, weight, shape, parr mark number and contrast in three F2 hybrid families of European and North American strains of Atlantic salmon using single nucleotide polymorphisms. GridQTL software was used to perform separate analyses for male and female linkage maps. Numer...