Climate Change Adaptation and Restoration of Western Trout Streams: Opportunities and Strategies

Climate Change Adaptation and Restoration of Western Trout Streams: Opportunities and Strategies Climate change is contributing to the severity and rate of stream degradation by changing the timing of peak flows, altering flow regimes, creating more frequent and intense disturbances, and increasing stream temperatures. Herein we describe three case studies of trout stream adaptation that.. read more →

Transactions Journal: A Sex-Determining Gene (sdY) Assay Shows Discordance between Phenotypic and Genotypic Sex in Wild Populations of Chinook Salmon

Abstract Sex is determined genetically in most fishes, but the gene responsible for sex determination is not known for the vast majority of fish species, including Chinook Salmon Oncorhynchus tshawytscha. The purpose of this study was to characterize a putative sex-determining gene (“sexually dimorphic on the Y-chromosome” [sdY] gene) in Chinook Salmon and develop a.. read more →

Transactions Abstract: Morphometric Contribution to the Detection of Introgressive Hybridization in the Endangered Owens Tui Chub in California

Abstract The Owens Tui Chub Siphateles bicolor snyderi has become endangered by introgressive hybridization with the Lahontan Tui Chub S. bicolor obesa since the 1960s. Adequate conservation strategies require prior identification of pure populations, which is usually difficult because the diagnostic features presented in the formal subspecies description do not always allow unequivocal determination of.. read more →

• Transactions Abstract: Quantifying Avian Predation on Fish Populations: Integrating Predator-Specific Deposition Probabilities in Tag Recovery Studies

Abstract Accurate assessment of specific mortality factors is vital to prioritize recovery actions for threatened and endangered species. For decades, tag recovery methods have been used to estimate fish mortality due to avian predation. Predation probabilities derived from fish tag recoveries on piscivorous waterbird colonies typically reflect minimum estimates of predation due to an unknown.. read more →

• Transactions Abstract: Does Catch-and-Release Angling Alter the Behavior and Fate of Adult Atlantic Salmon During Upriver Migration?

Abstract To reproduce, Atlantic Salmon Salmo salar return to freshwater rivers and migrate upriver to spawning areas. This migration is the basis for recreational fisheries, which for conservation reasons are increasingly characterized by catchand-release angling. The effectiveness of catch and release for Atlantic Salmon conservation is contingent on the ability of individuals to recover from.. read more →

• Transactions Abstract: Reproductive Complexity in a Long-Lived Deepwater Fish, the Blackgill Rockfish

Abstract Fish populations are regulated by complex biological processes and ecosystem interactions. To inform stock assessments and management models, a clear understanding of a species’ reproductive biology is necessary, particularly in long-lived species, for which estimates of sustainable yield are sensitive to such parameters. Deviations from traditional views of iteroparity in marine fishes (e.g., prolonged.. read more →

Dose-Dependent Effects of the Clinical Anesthetic Isoflurane on Octopus vulgaris: A Contribution to Cephalopod Welfare

A Journal of Aquatic Animal Health article ( was recently cited in Science magazine’s “How to anesthetize an octopus” video at: Taylor & Francis is providing free access to the full article until December 31, 2014. Abstract Recent progress in animal welfare legislation relating to invertebrates has provoked interest in methods for the anesthesia of cephalopods, for.. read more →

20 Nov 2014
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Use of Clove Oil and Eugenol to Anesthetize Fingerling Shabut Barbus grypus

Abstract In this study, the efficacy of four doses of clove oil and eugenol were compared to sedate fingerling ShabutBarbus grypus to various stages of sedation and recovery. The results from the present study indicated that effective concentrations were at 50 μL/L for eugenol (induction time: 58 ± 8 s; recovery time: 199 ± 15 s [mean ± SD]).. read more →

18 Oct 2014
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Influence of Habitat Characteristics on Shore-Spawning Kokanee

Influence of Habitat Characteristics on Shore-Spawning Kokanee by Steven L. Whitlock, Michael C. Quist and Andrew M. Dux Abstract Sockeye Salmon Oncorhynchus nerka and kokanee (lacustrine Sockeye Salmon) commonly spawn in both lentic and lotic environments; however, the habitat requirements of shore spawners are virtually unknown relative to those of stream spawners. A laboratory experiment and.. read more →

30 Sep 2014
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TRANSACTIONS: Sexual Segregation of Spiny Dogfish

Sexual Segregation of Spiny Dogfish in Fishery-Dependent Surveys in Cape Cod, Massachusetts: Potential Management Benefits Abstract: Commercial gill-net and longline surveys were conducted in the Cape Cod, Massachusetts, area to assess whether the proportion of male Spiny Dogfish Squalus acanthias in the catch changes throughout a normal fishing day (an event frequently observed by local commercial longliners).. read more →

19 Jun 2014
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David Bella—Plenary Speaker Abstract for the 144th AFS Annual Meeting

Systemic Distortion David Bella, Oregon State University, Corvallis I have been asked to succinctly convey some lessons involving two related problems not well addressed in your educations. First, distortion of information emerges on vast scales. Second, reductionism—reducing the character of wholes to the character of their parts—misperceives such distortions. Together, these two failures combine to.. read more →

Thierry Oberdorff—Plenary Speaker Abstract for the 144th AFS Annual Meeting

Patterns in Riverine Fish Diversity: A Macroecological Perspective Thierry Oberdorff,  Muséum national d’Histoire naturelle, Paris Here I develop a conceptual framework that views contemporary riverine fish diversity as a product of a series of filters operating at different spatial and temporal scales and combining different processes, the heart of which is the drainage basin. The.. read more →

Ana Parma—Plenary Speaker Abstract for the 144th AFS Annual Meeting

Leveraging Local Experience to Improve Sustainability of Global Fisheries: It Is Not About Tools But Processes Ana Parma, Centro Nacional Patagonico, Puerto Madryn Chubut, Argentina The quest for management approaches to achieve sustainable fisheries has often led to prescriptions of technical fixes and tools for assessment, harvest control, and regulation of access privileges, without due.. read more →

Louis Bernatchez—Plenary Speaker Abstract for the 144th AFS Annual Meeting

Think/Act Globally and Locally; The Essential Contribution of Basic Science Towards Improved Fishery Management Louis Bernatchez, Université Laval, Quebec City Economical and budgetary concerns are increasingly pushing government research funding toward utilitarian research with expected quick return for the industry at the expense of basic science. Investing in utilitarian research has obvious merits, yet this.. read more →

More than Mucus: The Hidden World of the Fish Microbiota

More than Mucus: The Hidden World of the Fish Microbiota By Andrea M. Larsen and Cova R. Arias All living organisms maintain a diverse community of microbes that live in association with mucus-covered surfaces including the digestive, respiratory, and urogenital tracts. These microbial communities are known as ‘microbiota’. We grow up viewing microbes as disease-causing.. read more →

Flood Effects on Road–Stream Crossing Infrastructure: Economic and Ecological Benefits of Stream Simulation Designs

Abstract: Stream simulation design is a geomorphic, engineering, and ecologically based approach to designing road–stream crossings that creates a natural and dynamic channel through the crossing structure similar in dimensions and characteristics to the adjacent natural channel, allowing for unimpeded passage of aquatic organisms, debris, and water during various flow conditions, including floods. A retrospective.. read more →