Download or read book Effects of Habitat and Predator prey Interactions on Stocked Sockeye Fry in Tatsamenie Lake written by Renate R. Riffe and published by . This book was released on 2006 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tatsamenie Lake has been stocked with marked sockeye salmon fry since 1991, as part of a program initiated by the Pacific Salmon Commission to increase annual returns of sockeye salmon (Oncorhynchus nerka) to the Taku River system by 100,000 fish annually. However, the average annual commercial catch of stocked Tatsamenie sockeye salmon between 1995 and 2000 has been only about 2,000 fish. This study was conducted in 2001 and 2002 to ascertain whether predators were targeting stocked sockeye fry in the lake, and which species, if any, were responsible. Other questions investigated included whether age-0 stocked sockeye fry were migrating prematurely from the lake, and whether differences in water chemistry between Tatsamenie Lake and the incubating hatchery were depressing stocked-fry survival rates.

Download or read book Predation on Sockeye Salmon Fry by Piscivorous Fishes in the Lower Cedar River and Southern Lake Washington written by Roger Tabor and published by . This book was released on 1996 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predation of Sockeye Salmon Fry by Cottids and Other Predatory Fishes in the Cedar River and Southern Lake Washington 1997 written by Roger Tabor and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sharks of the Pacific Northwest written by Alessandro De Maddalena and published by Harbour Publishing. This book was released on 2007 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Those who think of sharks as something only found in tropical waters will be surprised to learn that there are 18 species of sharks in the cool waters of the Pacific Northwest, from the 27-inch brown catshark to the 39-foot basking shark. Sharks of the Pacific Northwest provides for the identification of these species, with spectacular photographs and accurate paintings and drawings, plus summaries of the sharks' classification, morphology, distribution, habitat, diet, reproduction and behaviour. It also includes a concise general account of shark evolution, anatomy and physiology, as well as discussion of attacks on humans and details of shark fisheries. It is primarily aimed at a broad, non-technical readership, but its up-to-date and detailed contents make it a useful tool for professional biologists and zoologists.