Download or read book Comparisons of Fish Assemblages and Habitat Associations in Littoral Zones of Reservoirs in the Willamette Basin Oregon written by Paul Michael Bennett and published by . This book was released on 2002 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: The littoral zones of seven reservoirs in the southern Willamette Valley of Oregon were sampled with a boat electroshocker during the summer months of 1995 and 1996. Shoreline substrates were inventoried before sampling sites were randomly selected. Sampling sites consisted of 9 of 12 possible habitat types including four substrate types (bedrock, fines, gravel to small boulders, and large boulders), each with or without overlying vegetation or wood. Fish assemblages occupying these specific habitat types were compared. Various aspects of substrate distribution and dimensions were utilized to help explain differences in fish assemblages. Significant differences in richness, diversity, mean length, mean weight, and catch per unit effort (CPUE) of fish assemblages occupying the specific habitat types were found. Fish assemblages using vegetated substrates were greatest in richness, diversity, and CPUE, while bedrock and unvegetated fines were lowest. Gravel to small boulder substrates tended to be intermediate for these variables. Large boulder substrates were consistently on the higher end of the range of these values. The largest and oldest fish occupied habitats with wood and large boulder substrates; smaller, younger individuals tended to be found in fine substrates with vegetation. Largemouth bass, bluegill, and coarsescale suckers were well distributed across habitat types. Other species such as the yellow bullhead, white crappie, reticulate sculpin, longnose dace, and speckled dace were much more restricted in their use of habitat. Overlying structure tended to increase fish diversity and richness for fine but not for coarse size substrates. Comparison of fish species between reservoirs, using regression analysis, was also performed. Fish sampled in Lookout Point Reservoir showed the overall greatest weight for length values, whereas, fish from Hills Creek and Green Peter Reservoirs were lowest in these values of the seven study reservoirs. Regression analysis of specified substrate parameters to fish species richness and diversity indicated bedrock was generally a negative influence. The occurence of gravel to small boulder substrate was a positive influence over the range of segment sizes encountered. Large expanses of fines resulted in depressed richness and diversity. Conversely, smaller segments of fine habitat appear to have a strong positive effect on fish richness and diversity. Large boulders were found in too small a quantity to impact reservoir littoral zone fish assemblages. The exotic/native ratio of fish abundance averaged about 3/1 in all habitats sampled except fine substrates without overlying structure. Only here were native fish more abundant than exotics.

Download or read book Summary of Information on Aquatic Biota and Their Habitats in the Willamette Basin Oregon Through 1995 written by Bob Altman and published by . This book was released on 1997 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fish and Wildlife Resources of the Middle Willamette Basin Oregon and Their Water Use Requirements written by Oregon. State Game Commission. Basin Investigations Section and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Importance of the Upper Littoral Zone as Rearing Area for Larval and Juvenile Fishes in a Columbia River Impoundment written by Larry D. La Bolle and published by . This book was released on 1984 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow-water habitats (0.5 m depth) of the upper littoral zone of John Day Pool of the Columbia River were heavily used by young fishes in comparison with lower littoral and limnetic waters. Through the season, 96.9% of the 64,700 larvae and juveniles collected (corrected for effort) were from upper littoral habitats. The sequential appearance of species and their change in life stage was the dominant ecological process identified in the ordination of sites and species. Spatially distinct species associations were identified in the cluster analysis, but they were temporally restricted because the composition of the community of young fishes changed continually. Three general patterns of habitat use by larval and juvenile fishes emerged: 1) a strongly littoral assemblage of native species of cyprinidae and catostomidae that was dominant in the tailrace and transition zones of the reservoir; 2) as association of introduced fishes with more lentic habitats (primarily centrarchidae), most abundant in the forebay and backwaters, and 3) larvae of two species, more limnetic in dispersal than others, rearing throughout the reservoir. General patterns of habitat use by larvae were consistently reflected in correlations of their abundance with physical variables. Larvae of three littoral native species, northern squawfish (Ptychocheilus oregonensis), largescale sucker (Catostomus macrocheilus), and peamouth (Mylocheilus caurinus), dominated the catch numerically ( 75%), and were in great abundance during the day in the margin microhabitats (

Download or read book Comprehensive Plan for Production and Management of Oregon s Anadromous Salmon and Trout General considerations written by Oregon. Anadromous Fish Section and published by . This book was released on 1982 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wildlife Habitats in Managed Rangelands written by Pacific Northwest Forest and Range Experiment Station (Portland, Or.) and published by . This book was released on 1979 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Southeastern Oregon has a variety of fish habitats which include major rivers, tributary streams, large and small reservoirs, lakes, and springs. These habitats are directly related to and highly dependent on the conditions of the surrounding rangeland watersheds. Satterlund (1975, p. 22) put it this way: "Rangelands may yield little water, but they are second only to cultivated lands as a source of water quality problems." It may be fairly stated, therefore, that man's agricultural activities in rangelands of southeastern Oregon have altered aquatic habitats more than any other land use."

Download or read book Freshwater Fisheries Ecology written by John F. Craig and published by John Wiley & Sons. This book was released on 2016-01-12 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inland fisheries are vital for the livelihoods and food resources of humans worldwide but their importance is underestimated, probably because large numbers of small, local operators are involved. Freshwater Fisheries Ecology defines what we have globally, what we are going to lose and mitigate for, and what, given the right tools, we can save. To estimate potential production, the dynamics of freshwater ecosystems (rivers, lakes and estuaries) need to be understood. These dynamics are diverse, as are the earths freshwater fisheries resources (from boreal to tropical regions), and these influence how fisheries are both utilized and abused. Three main types of fisheries are illustrated within the book: artisanal, commercial and recreational, and the tools which have evolved for fisheries governance and management, including assessment methods, are described. The book also covers in detail fisheries development, providing information on improving fisheries through environmental and habitat evaluation, enhancement and rehabilitation, aquaculture, genetically modified fishes and sustainability. The book thoroughly reviews the negative impacts on fisheries including excessive harvesting, climate change, toxicology, impoundments, barriers and abstractions, non-native species and eutrophication. Finally, key areas of future research are outlined. Freshwater Fisheries Ecology is truly a landmark publication, containing contributions from over 100 leading experts and supported by the Fisheries Society of the British Isles. The global approach makes this book essential reading for fish biologists, fisheries scientists and ecologists and upper level students in these disciplines. Libraries in all universities and research establishments where biological and fisheries sciences are studied and taught should have multiple copies of this hugely valuable resource. About the Editor John Craig is Editor-in-Chief of the Journal of Fish Biology and has an enormous range of expertise and a wealth of knowledge of freshwater fishes and their ecology, having studied them around the globe, including in Asia, North America, Africa, the Middle East and Europe. His particular interests have been in population dynamics and life history strategies. He is a Fellow of the Linnean Society of London and the Royal Society of Biology.

Download or read book Composition Structure and Habitat Associations of Fish Assemblages of the Dolan Falls Preserve written by Nora Edith Valdes Cantu and published by . This book was released on 1995 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Setting of the Willamette Basin Oregon written by Mark A. Uhrich and published by . This book was released on 1999 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book IMPACT OF SMALL SCALE DAMS ON FISHES OF THE WILLAMETTE RIVER OREGON AND AN EVALUATION OF FISH HABITAT MODELS written by Hiram W. Li and published by . This book was released on 1983 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Fish and Wildlife Resources of the Upper Willamette Basin Oregon and Their Water Requirements written by James M. Hutchison and published by . This book was released on 1966 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental Variables as Predictors of Fish Assemblages in the Tillamook Basin Oregon written by Cathleen E. Rose and published by . This book was released on 2000 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Tillamook and Kilchis subbasins of the Tillamook Bay watershed (Oregon Coast Range) have differences in geology and land use history and, therefore, varied environmental conditions that could affect fish assemblages. Fifty-two randomly selected wadeable stream reaches in these two subbasins were surveyed for stream habitat and fish assemblage composition during two summer field seasons. Data collected were used to identify environmental variables most associated with fish assemblages, determine major predictors of fish species relative abundance, and test for any differences in fish assemblages between the Tillamook and Kilchis subbasins and among three stream orders. Eleven fish species were encountered, including four salmonid species (Oncorhynchus spp.) and five species of sculpin (Cottus spp.). For three sites visited twice in both field seasons, variability in fish assemblages and environmental measurements between sample years and between early and late-summer visits to sites was low. Fish assemblages differed between the two subbasins. The assemblages in the Kilchis subbasin contained higher proportions of trout species, while the Tillamook subbasin assemblages contained higher proportions of sculpin species. A breakdown of fish assemblages by stream order showed that different fish species dominated the assemblages in different sized streams. With data from both subbasins combined, trout species composed a smaller proportion of the fish assemblages in larger streams, and sculpin species composition also varied with stream order. Results from non-metric multidimensional scaling ordinations indicated that substrate type, stream gradient, and variables related to stream size were the most highly correlated to fish species relative abundances. Multiple linear regression was used to assess the usefulness of an uncorrelated subset of the environmental variables as predictors of relative abundance of the six most common fish species. The environmental variables were good predictors of relative abundance for some species, but were less successful in predicting abundances of entirely anadromous species. These results provide valuable insight into fish-habitat relationships using a fish assemblage perspective and incorporating species, such as sculpins, for which there is little existing information. There has been recent interest in quantifying the effects of human land use on stream fish, and these data can be used in future studies to explore potential links between important environmental variables and land use practices.

Download or read book A Five year Comprehensive Anadromous Fish Habitat Enhancement Plan for Oregon Coastal Rivers written by and published by . This book was released on 1985 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Prepared to provide current information concerning opportunities to improve the present productivity of anadromous salmonid habitat (primarily salmon and steelhead) on Bureau [of Land Management] lands in coastal rivers of Oregon. Habitat rehabilitation and/or enhancement work is done to increase populations of wild fish, which results in greater numbers of fish available for harvest by recreational and commercial fisheries important to Oregon's coastal economy, communities and populace in general. The proposed habitat projects listed in this report constitute a logical plan for orderly fish habitat development work by identified district priorities over a five-year period"--Page 1

Download or read book Habitat Associations of Fish Species and Their Assemblages in the Tonawanda and Johnson Creek Watersheds of Northwestern New York State written by Scott M. Wells and published by . This book was released on 2009 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stream fishes and their habitats were surveyed at 108 sampling sites to determine the status of the rare longear sunfish (Lepomis megalotis) and redfin shiner (Lythrurus umbratilis) in the Tonawanda (TCW) and Johnson Creek (JCW) watersheds of northwestern New York, May-September 2005. Of the>27,500 individuals captured and 70 fish species identified, most were cyprinids, followed by centrarchids, catostomids, and percids. Each watershed revealed cyclic patterns and substantial variation in the longitudinal profiles of habitat and fish assemblage variables, especially at sites with anthropogenic disturbances. Fish assemblages were easily delineated longitudinally in the two watersheds using detrended correspondence analysis (DCA) but associating fish species and their assemblages variables (CPUE, fish richness, Simpson's Diversity) with habitat variables was more challenging using canonical correspondence analysis (CCA: 62 associations, 27 species) and multiple linear regression (MLR: 80 associations, 47 species/33 assemblages) at 17 watershed and sub-watershed scales. In the more statistically rigorous MLR analyses, aquatic vegetation accounted for the greatest number of habitat associations (32%), followed by pool type, bank cover and substrate composition (16-17% each), suggesting that these habitat features may have been the most important to stream fishes in the study. In most cases, these finding were supported by the literature on stream fish ecology. Overall, fish species richness has remained relatively high and stable over time in both watersheds, even with ongoing localized disturbances occurring in the lower basins: NYS Barge (Erie) Canal, Batavia Dam (TCW) and Lyndonville Dam (JCW), as well as agricultural and suburban activities. New habitat associations were suggested for seven species. Findings from this study have already assisted with restoration efforts for the longear sunfish and may support future management of lesser known stream fishes in New York State.

Download or read book Biennial Report written by Oregon. Department of Fish and Wildlife and published by . This book was released on 1975 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Willamette Basin Fish Management Plan written by Oregon Department of Fish and Wildlife and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Briefs Fish Commission of Oregon written by Oregon. Fish Commission and published by . This book was released on 1949 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: