Download or read book Dolly Varden Salvelinus Malma Malma from the Big Fish River written by Colin P. Gallagher and published by . This book was released on 2013 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Anadromous Dolly Varden Salvelinus Malma W of the Big Fish River NT Canada 1972 1994 electronic Resource written by Canada. Department of Fisheries and Oceans. Central and Arctic Region and published by Department of Fisheries and Oceans. This book was released on 2002 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anadromous Dolly Varden (Salvelinus malma) spawn and over-winter at the "Fish Hole" on Cache Creek, a tributary of the Big Fish River. Subsistence fishermen, primarily from Aklavik, NT, have long harvested the Dolly Varden from this stock. In the early 1980's, declines in the number and size of the fish caught (compared with catches in the 1970's) provided strong indication to the community, Fisheries Joint Management Committee (FJMC) and DFO that the stock was in a state of decline. In June 1987, the community of Aklavik decided to close the Big Fish River to all fishing to allow the stock to recover, and it remained closed for five years. A small quota has been in place since the river was reopened in 1992, with an average of less than 50 Dolly Varden taken annually in the river or it's tributaries. From 1990-1999, on average, 216 Dolly Varden were harvested annually along the shores of Shingle Point, and up to 50% of these may have been of Big Fish River origin. Estimates of the size of the stock in 1973 (13,500 and 20,700) were higher than more recent estimates (in 1991, 2232 with 95% CI 1716-2748; in 1994, 4477 with 95% CI 2305- 6649), suggesting there has been a decreasing trend over the past twenty years. The stock has apparently not recovered in size, despite reduced fishing pressure since 1987. While the size of the stock has not increased, the size and age of the fish have. Between 1986 and 1994, mean length and age increased, while the sex ratio among the anadromous spawners remained highly skewed toward females (e.g., 6:1). Age at first maturation for Big Fish River females is lower (e.g., 5 years) than in neighbouring systems which are relatively unexploited. The majority of mature Dolly Varden of the Big Fish River spawn annually, as opposed to those from neighbouring stocks that spawn every second or third year. The paucity of spawning anadromous males, the apparent absence of "large silvers" (current year non-spawning [resting] adults), lower sizerelated fecundity and larger egg size are thought to cumulate thus reducing the overall reproductive potential of the stock. Continued fishing in Yukon coastal waters, although minimal, may be hampering the recovery process. The apparent reduction in the amount of available spawning and over-wintering habitat at Cache Creek as a result of natural processes is also thought to be a contributing factor to lack of recovery in the abundance of the stock.
Download or read book Studies of Anadromous Dolly Varden Salvelinus Malma W of the Big Fish River NT Canada 1972 94 written by and published by . This book was released on 2002 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews studies of the anadromous Dolly Varden stock of the Big Fish River, located west of Aklavik, Northwest Territories. Topics covered include: the fishery & harvests since 1972; stock delineation; stock parameters, including stock size and the estimation methods used, length & age, age at first maturation, life history stage composition, sequential spawning, growth rates, fecundity & egg diameter, and sex ratios; and natural changes in the freshwater habitat that may have affected the stock. The final section discusses factors that would be expected to limit the ability of the stock to sustain a fishery.
Download or read book Studies of Anadromous Dolly Varden salvelinus Malma w of the Big Fish River NT Canada 1972 1994 written by S. J. Sandstrom and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological Research in Aquatic Science written by Yusuf Bozkurt and published by BoD – Books on Demand. This book was released on 2019-07-10 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biological research has a wide range of applications in aquatic science, which explores aquatic organisms' morphological and physiological characteristics, their behavior and interactions, and their surrounding environment. Organized into five sections and written by experts in their respective fields, Biological Research in Aquatic Sciences covers topics including cryobiology, spermatology, climate change, migration of aquatic species, and plankton in aquatic ecosystems. This book will help researchers and interested readers better understand current trends in biological research regarding aquatic science.
Download or read book Synthesis of Biological and Harvest Information Used to Assess Poulations of Northern Form Dolly Varden Salvelinus Malma Malma in Canada written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Local and Scientific Observations of Dolly Varden Salvelinus Malma W in the Big Fish River Northwest Territories Canada written by Sam A. Stephenson and published by . This book was released on 2003 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Local and Scientific Observations of Dolly Varden Salvelinus Malma W in the Big Fish River Northwest Territories Canada 1995 2002 written by Canada. Department of Fisheries and Oceans. Central and Arctic Region and published by . This book was released on 2003 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Bulletin of the Fish and Wildlife Service written by and published by . This book was released on 1958 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of Biological and Harvest Information Used to Assess Populations of Northern Form Dolly Varden Salvelinus Malma Malma in Canada Part II Big Fish River written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fishery Bulletin of the written by and published by . This book was released on 1958 with total page 1104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Distributions of Fishes in Fresh Water of Katmai National Monument Alaska and Their Zoogeographical Implications written by William R. Heard and published by . This book was released on 1969 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Hamma Hamma Hydroelectric Project written by United States. Office of Hydropower Licensing and published by . This book was released on 1985 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Report on the Salmon and Salmon Rivers of Alaska with Notes on the Conditions Methods and Needs of the Salmon Fisheries written by Tarleton Hoffman Bean and published by . This book was released on 1891 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
