903 research outputs found
Aspects of the respiratory metabolism of juvenile rainbow trout (Oncorhynchus mykiss) at sustained swimming speeds
No full textBibliography: leaves 98-111.A detailed description of the design of an apparatus suitable for investigations into the respiratory physiology of small nektonic organisms at various swimming speeds is presented. Juvenile rainbow trout (Oncorhynchus mykiss) were used to evaluate the performance of the apparatus. Twenty-four hour experiments indicated no detectable diurnal variation in the respiration rates of juvenile rainbow trout. Experiments investigating aerobic energy expenditure at sustained swimming speeds, through measurements of oxygen consumption rates, are described. Oxygen consumption was found to increase exponentially with increasing swimming speed. The influence of body size on this relationship was examined. The contribution of anaerobic metabolism at sustained swimming speeds was investigated
Dr. Nick Trout, John Ensminger, and Dr. Joann Lindenmayer with Monica Collins discuss, Extreme Dog: What Right Do Our Pets Have To Be Saved? , video recording, 9/16/2010
No full textDr. Nick Trout, staff surgeon at Angell Animal Medical Center and author of Tell Me Where It Hurts; attorney John Ensminger, dog advocate and creator of doglawreporter.blog spot.com; and Dr. Joann Lindenmayer, Associate Professor at the Cummings School of Veterinary Medicine at Tufts University, join moderator Monica Collins, syndicated columnist of Ask Dog Lady, to discuss whether we as a society have gone too far in treating dogs with extensive medical problems. Nick Trout, author of “Tell Me Where It Hurts,” and John Ensminger author of “Service and Therapy Dogs in American Society,” will be signing and selling their respective books at the end of the event.https://dc.suffolk.edu/fhf-av/1100/thumbnail.jp
Differences in metabolic response to Loma salmonae infection in juvenile rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis
No full textRoutine and post-exercise metabolic rates were measured for juvenile rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis infected with the microsporidium gill parasite Loma salmonae under laboratory conditions. Rainbow trout increased routine and post-exercise metabolic rate in response to infection compared with controls. Brook trout, on the other hand, lowered routine metabolic rate without effecting post-exercise metabolic rate compared to controls. The result of these 2 different strategies may either reflect defense of metabolic scope or a difference in the rate of recovery of the excess post-exercise oxygen consumption between the 2 species in response to the same infection.LR: 20061115; PUBM: Print; JID: 8807037; ppublishSource type: Electronic(1
Evaluation of Apache trout habitat protection actions
No full textabstract: Apache trout is a federally threatened salmonid native to headwaters of the Little Colorado, Black, and White rivers in east-central Arizona. Decline of Apache trout to threatened status was attributed to over-fishing, habitat degradation and negative interactions (predation, competition and hybridization) with introduced nonnative salmonids. Although over-fishing is no longer considered a threat, habitat degradation and negative interactions with nonnative salmonids continue to threaten Apache trout, and it is towards these threats that recovery actions are directed. While barrier construction began in 1979 and livestock exclusion began in the mid-1980s, the efficacy of these recovery actions at increasing Apache trout abundance and improving habitat condition had not been evaluated. We therefore initiated a study to evaluate the efficacy of riparian fencing and barriers.Technical guidance bulletin ; no. 7Includes bibliographical references (p. 18-19)
Interactions among trout and Little Colorado spinedace, Lepidomeda vittata
No full textabstract: In Arizona, various nonnative trout have been stocked since the early 1900s, and trout angling remains an important component of the sportfishing industry. These nonnative rainbow trout may have contributed to the decline of Little Colorado spinedace. The overall purpose of the research was to define interactions so that impacts to both trout management and spinedace populations can be minimized. Our objectives covered 5 broad areas of potential interaction: habitat use, diet, predation, health, and distribution.Technical guidance bulletin ; no. 2Includes bibliographical references (p. 20-21
A bioinformatics-based update on microRNAs and their targets in rainbow trout (Oncorhynchus mykiss)
No full textMicroRNAs (miRNAs) participate in various vitally biological processes via controlling target genes activity and thousands of miRNAs have been identified in many species to date, including 18,698 known animal miRNA in miRBase. However, there are only limited studies reported in rainbow trout (Oncorhynchus mykiss) especially via the computational-based approaches. In present study, we systematically investigated the miRNAs in rainbow trout using a well-developed comparative genome-based homologue search. A total of 196 potential miRNAs, belonging to 124 miRNA families, were identified, most of which were firstly reported in rainbow trout. The length of miRNAs ranged from 17 to 24 nt with an average of 20 nt while the length of their precursors varied from 47 to 152 nt with an average of 85 nt The identified miRNAs were not evenly distributed in each miRNA family, with only one member per family for a majority, and multiple members were also identified for several families. Nucleotide U was dominant in the pre-miRNAs with a percentage of 30.04%. The rainbow trout pre-miRNAs had relatively high negative minimal folding free energy (MFE) and adjusted MFE (AMFE). Not only the mature miRNAs but their precursor sequences are conserved among the living organisms. About 2466 O. mykiss genes were predicted as potential targets for 189 miRNAs. Gene Ontology (GO) analysis showed that nearly 2093, 2107, and 2081 target genes are involved in cellular component, molecular function, and biological processes respectively. KEGG pathway enrichment analysis illuminated that these miRNAs targets might regulate 105 metabolic pathways, including those of purine metabolism, nitrogen metabolism, and oxidative phosphorylation. This study has provided an update on rainbow trout miRNAs and their targets, which represents a foundation for future studies. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.MicroRNAs (miRNAs) participate in various vitally biological processes via controlling target genes activity and thousands of miRNAs have been identified in many species to date, including 18,698 known animal miRNA in miRBase. However, there are only limited studies reported in rainbow trout (Oncorhynchus mykiss) especially via the computational-based approaches. In present study, we systematically investigated the miRNAs in rainbow trout using a well-developed comparative genome-based homologue search. A total of 196 potential miRNAs, belonging to 124 miRNA families, were identified, most of which were firstly reported in rainbow trout. The length of miRNAs ranged from 17 to 24 nt with an average of 20 nt while the length of their precursors varied from 47 to 152 nt with an average of 85 nt The identified miRNAs were not evenly distributed in each miRNA family, with only one member per family for a majority, and multiple members were also identified for several families. Nucleotide U was dominant in the pre-miRNAs with a percentage of 30.04%. The rainbow trout pre-miRNAs had relatively high negative minimal folding free energy (MFE) and adjusted MFE (AMFE). Not only the mature miRNAs but their precursor sequences are conserved among the living organisms. About 2466 O. mykiss genes were predicted as potential targets for 189 miRNAs. Gene Ontology (GO) analysis showed that nearly 2093, 2107, and 2081 target genes are involved in cellular component, molecular function, and biological processes respectively. KEGG pathway enrichment analysis illuminated that these miRNAs targets might regulate 105 metabolic pathways, including those of purine metabolism, nitrogen metabolism, and oxidative phosphorylation. This study has provided an update on rainbow trout miRNAs and their targets, which represents a foundation for future studies. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved
Stimulation of reproductive growth in rainbow trout (Oncorhynchus mykiss) following exposure to treated sewage effluent
No full textRainbow trout (Oncorhynchus mykiss) were exposed to 1.5 and 15% v/v secondary treated sewage effluent for 32 weeks in flow-through mesocosms. The exposure encompassed the full period of reproductive development for rainbow trout. Trout did not show any evidence of a dose-dependent change in growth. Fish exposed to 15% effluent were the only group to show mortality (5%) over the duration of the experiment. Trout at the highest effluent concentration had significantly higher liver size than reference water fish. Both male and female trout in the 15% exposure group also exhibited significantly higher gonad weight than the reference group. In female trout, this gonad size increase could be explained by higher egg numbers. Female and male trout both displayed a significant increase in plasma 17 beta-estradiol levels after exposure to 15% effluent, while neither sex had dose-dependent differences in plasma testosterone. Male trout displayed elevated vitellogenin levels and reduced plasma 11-ketotestosterone concentration after exposure to 15% effluent. Chemical examination of steroidal compounds, including both estrogens and androgens, in the wastewater revealed that only estrone was detectable at a mean concentration of 4.5 ng/L. It is assumed that the effects observed in trout exposed to 15% effluent were consistent with stimulation of reproductive development due to very low levels of estrogens. Overall, long-term exposure to treated sewage effluent containing low levels of estrogen did not have significant negative implications for reproductive development in rainbow trout.PUBM: Print; JID: 8308958; 0 (Sewage); 0 (Vitellogenins); 0 (Water Pollutants); ppublishSource type: Electronic(1
Failure of vaccination in brook trout Salvelinus fontinalis against Loma salmonae (Microspora)
No full textLoma salmonae OA- and SV-strains were isolated from Oncorhynchus kisutch after passage of infective gill material through rainbow trout Oncorhynchus mykiss and brook trout Salvelinus fontinalis, respectively. In infection Trial I, six groups of thirty-five 10-g fish were isolated into 70-litre fibreglass tanks supplied with fresh water at 15 degrees C. Using oral gavage, they were exposed to the following inocula: Group I, brook trout exposed to 200 000 spores of L. salmonae OA; Group II, brook trout exposed to 200 000 spores of L. salmonae SV; Group III, brook trout sham-exposed to water only; Group IV, rainbow trout exposed to 200 000 spores of L. salmonae OA; Group V, rainbow trout exposed to 200 000 spores of L. salmonae SV; and Group VI, rainbow trout exposed to water only. In infection Trial II, initiated at week 7, brook trout from Groups I-III were orally re-challenged with 200 000 spores of L. salmonae SV, while those in Groups IV-VI were orally re-challenged with 200 000 spores of L. salmonae OA. It was found that, whereas prior exposure to either of the two strains of L. salmonae led to marked resistance of rainbow trout to a second challenge, brook trout failed to mount an effective protective response..RE: 8 ref.; SC: 0Y; 0I; 0V; CA; EC; PA; VE; ZA; XURL: E-MAILSource type: Electronic(1)[email protected]; http://upei-resolver.asin-risa.ca?sid=SP:CABI&id=pmid:&id=&issn=0388-788X&isbn=&volume=38&issue=1&spage=27&pages=27-28&date=2003&title=Gyobyo%20Kenkyu%20=%20Fish%20Pathology&atitle=Failure%20of%20vaccination%20in%20brook%20trout%20Salvelinus%20fontinalis%20against%20Loma%20salmonae%20%28Microspora%29.&aulast=Speare&pid=%3Cauthor%3ESpeare%2c%20D%20J%3bDaley%2c%20J%3C%2Fauthor%3E%3CAN%3E20033056847%3C%2FAN%3E%3CDT%3EJournal%20article%3C%2FDT%3
Capillariosis Infection of the liver in Rainbow Trout
No full textΔεν διατίθεται περίληψη.The author described, for the first time in Greece, a case of liver Capillariosis (C. Petruschewskii) in rainbow trout, observed in a unit of trout culture. The author studied and described the clinical, anatomopathological and histological changes of the disease and concluded that hepatic Capillariosis in rainbow trout runs asymptotnatically without producing untorward consequences in the unit
trout river
No full texttrout n...the author, taking his fishing apparatus with him, proceeded, on a solitary ramble, to the _trout river_...PRINTED ITEM G.M. StoryJanuary 1964Used I and SupNot usedNot usedmud trou
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