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Factors governing prolonged swimming performance of juvenile rainbow trout (Oncorhynchus mykiss) /McFarlane, Wendy J. January 2001 (has links)
Thesis (Ph.D.) -- McMaster University, 2001. / Includes bibliographical references. Also available via World Wide Web.
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Aflatoxin mutagenesis and metabolism and their dietary modification in rainbow trout (Salmo gairdneri)Coulombe, Roger A. 17 September 1982 (has links)
Aflatoxin B₁ (AFB₁) is a mold-produced toxin which has been shown
to be a potent hepatocarcinogen in many animal species. Of the
species studied thus far, rainbow trout have proven to be the most
sensitive. Experiments were conducted to investigate various aspects
of AFB₁ metabolism in this species, including in vitro mutagenesis,
and effects of dietary modifiers of AFB, carcinogenesis on in vitro
metabolism and mutagenesis. A comparative study of AFB₁ metabolism in
two salmonid species was also conducted.
In the first study, the relative mutagenic potencies of several
alfatoxin metabolites were evaluated using a trout liver fraction
system. Preliminary studies characterizing trout liver fractions for
use as an activation system were described. The results from
comparative mutagenicity experiments demonstrated that in vitro
mutagenic potencies qualitatively correlated with the in vivo
carcinogenic activities of various aflatoxins in rainbow trout. The
importance of these findings is discussed.
In the second study fish hepatocytes were characterized to
examine possible differences in activation of AFB₁ to bacterial
mutagens by hepatocytes from rainbow trout and coho salmon, two
species which are known to differ markedly in sensitivity to the
carcinogenic effects of AFB₁. Activation efficiency was approximately
three times greater in hepatocytes from trout compared to salmon. A
more marked difference was seen when S20 liver fractions from the two
species were used. Analysis of unbound [³H]AFB₁ metabolites revealed
that trout hepatocytes metabolized [³H]AFB₁ to a greater extent than
salmon. The results accurately reflected in vivo carcinogenesis
trends in salmonid fish.
Additional experiments were conducted to evaluate the effects of
dietary modifiers of AFB₁ carcinogenesis on in vitro mutagenesis and
metabolism of AFB₁.
Dietary β-naphthoflavone (β-NF) was shown to induce the
production of a novel trout metabolite of AFB₁, aflatoxicol M₁
(AFL-M₁). AFL-M₁ exhibited a mutagenic potency less than AFB₁ or
aflatoxicol (AFL), but greater than that of aflatoxin-M₁ (AFM₁).
Dietary β-NF, however, appeared to have no effect on in vitro
mutagenic activation of AFB₁ using hepatocytes or liver S20 fraction
from trout.
Dietary PCBs (Aroclor 1254) was shown to significantly decrease
in vitro mutagenesis of AFB₁, which reflected a similar PCB-mediated
inhibitory effect on AFB₁ carcinogenesis in trout in vivo.
Cyclopropenoid fatty acids (CPFAs) present in the diet (0-600
ppm) were shown to have no effect on in vitro mutagenesis of AFB₁,
indicating CPFAs may not significantly alter in vivo initiation of
AFB₁ carcinogenesis. / Graduation date: 1983
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Feed conversion, protein utilization and growth of rainbow trout (Salmo gairdneri) fed 25 to 45 percent herring oilKellems, Richard O. 08 June 1975 (has links)
Triplicate groups of rainbow trout (Salmo gairdneri) fed six
diets; five based on fish protein concentrate (FPC) ranging in caloric
density from 4.36 to 6.19 kcal/g, and one based on vitamin free
casein with a caloric density of 5.26 kcal/g were evaluated with
respect to diet ingredient utilization. The parameters used to evaluate
efficiency of diet utilization were: feed conversion, energy and protein
conversion, and growth. The desirability of the edible portion of the
fish produced on the different treatments from a flavor and texture
standpoint was determined.
The protein level was maintained at 38% of the dry diet, with
7.8% supplied by gelatin and the remainder by either FPC or casein.
The herring oil levels of the diets ranged from 25% to 45% of the dry
diet, and was the primary source of calories. Alpha-cellulose was
included as a filler and ranged from 12.2% to 31.2% of the dry diet.
The FPC based diets produced statistically superior weight gains
when compared to the casein based diet. The efficiency of feed conversion
was improved as the level of herring oil was increased. The
energy and protein conversions were relatively constant for the FPC
based diets, with the casein based diet being lower (P < 0.05). / Graduation date: 1975
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Substitutional relationships between rainbow trout and pansize salmon : a market demand analysisQueirolo, Lewis E. 13 December 1976 (has links)
The fundamental objective of this analysis was to isolate and
identify the factors governing the demand for domestically produced
rainbow trout in a representative west coast market, and assess the
impact on that demand, if any, of the introduction of pansize salmon.
The approach taken in this market demand study was to identify those
variables hypothesized to determine supply and demand for rainbow
trout. Several testable hypotheses concerning the anticipated relationships
were specified. It was hypothesized that a negative relationship
would exist between the price of trout at the brokerage level
and the quantity demanded at that level. Conversely, the price of
trout at the wholesale level was hypothesized to be positively correlated
with the quantity of rainbow trout demanded at the brokerage
level. Further, the signs on the coefficients of variables accounting
for the wholesale prices of substitute items were expected to be
negative, while comparable prices at the brokerage level should be
positive, based upon the hypothesis. It was hypothesized that the
presence of Japanese trout in the market place would have a negative
impact on the quantity of domestically produced trout demanded.
Personal disposable income was hypothesized to be positively correlated
with the quantity of trout demanded. Expectations were that
seasonal factors tend to cause trout demand to fluctuate cyclically.
An econometric simultaneous equations model was specified
from which estimates of the parameters of the demand equation were
obtained using Two Stage Least Squares techniques. A recognition of
the limitations associated with the available data set necessitates the
emphasizing of the preliminary nature of these results.
Data on quantities and prices of rainbow trout and equivalent
price series for hypothesized substitutes were obtained through personal
interviews with market participants and close observers
thereof.
The results of the study, while preliminary, tend to support the
original set of hypotheses concerning the interrelationships between
quantity of domestic trout demanded and own-price, the price of close
substitutes and seasonal demand fluctuations. Somewhat unexpectedly,
the regression seems to have uncovered a negative income/quantity
demanded relationship for rainbow trout. This raises some interesting
questions which might best be addressed in terms of hypotheses
for future analysis. / Graduation date: 1977
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Great Lakes lake trout early mortality syndrome (EMS) contaminants, thiamin status, and their possible interaction /Wright, Peggy J. January 2006 (has links)
Thesis (Ph.D.)--University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (March 1, 2007) Vita. Includes bibliographical references.
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Etude ecologique de l'Omble de fontaine (Salvelinus fontinalis, Mitchell) d'un ruisseau des Laurentides.Côté, Yvon. January 1970 (has links)
No description available.
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Accumulation of dietary polychlorinated biphenyl by rainbow trout (Salmo gairdneri)Lieb, Andrew James 26 April 1973 (has links)
Graduation date: 1973
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The age structure, length, condition, and movement of resident and coaster brook trout (Salvelinus fontinalis) in Pictured Rocks National Lakeshore, MichiganKusnierz, Paul C., January 2008 (has links)
Thesis (M.S.)--Northern Michigan University, 2008. / Bibliography: leaves 66-73.
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Migration, growth rate and population density of brook trout in the north branch of the Au Sable River, MichiganShetter, David Sibley, January 1937 (has links)
Thesis (Ph. D.)--University of Michigan, 1937. / Thesis note on label attached to p. 203. "Reprinted from volume 66 (1936) Transactions of the American Fisheries Society." "Literature cited": p. 210.
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Effects of the carbohydrate level and of dietary protein source on growth performance, plasma parameters and hepatic gene expression in rainbow trout /Wacyk, Jurij M. January 1900 (has links)
Thesis (Ph. D., Animal Physiology)--University of Idaho, June 2009. / Major professor: Ronald W. Hardy. Includes bibliographical references. Also available online (PDF file) by subscription or by purchasing the individual file.
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