Reseña del libro "pacific salmon (en Inglés)"
Bringing together for the first time most of the available biological information on the seven species of Pacific salmon, this comprehensive and fully illustrated volume provides an authoritative reference source on an economically and ecologically significant group. It is an invaluable source of information for students and teachers of fish biology and fisheries science, and professionals in the fishing and aquaculture industries. Pacific salmon are an important biological and economic resource of countries of the North Pacific rim. They are also a unique group of fish possessing unusually complex life histories. There are seven species of Pacific salmon, five occurring on both the North American and Asian continents (sockeye, pink, chum, chinook, and coho) and two (masu and amago) only in Asia. The life cycle of the Pacific salmon begins in the autumn when the adult female deposits eggs which are fertilized in gravel beds in rivers or lakes. The young emerge from the gravel the following spring and will either migrate immediately to salt water or spend one or more years in a river or lake before migrating. Migrations in the ocean are extensive during the feeding and growing phase, covering thousands of kilometres. After one or more years the maturing adults find their way back to their home river, returning to their ancestral breeding grounds to spawn. They die after spawning, and the eggs in the gravel signify the beginning of a new cycle. Upon this theme Pacific salmon have developed many variations, both between and within species. "Pacific Salmon: Life Histories" gives detailed descriptions of the different life phases through which each of the seven species pass. Each chapter is written by a scientist who has spent years studying and observing a particular species of salmon. Some of the topics covered are geographic distribution, transplants, freshwater life, ocean life, development, growth, feeding, diet, migration, and spawning behaviour. The text is richly supplemented by many maps, illustrations, colour plates, and tables and there is a detailed general index, as well as a useful geographic index. "C. Groot is an ethologist who has studied and worked in the field of fish behaviour in the Netherlands and Canada. At the Department of Fisheries and Oceans, Pacific Biological Station in Nanaimo, British Columbia, his studies have centred on the migration of Pacific salmon, particularly on how they find their way during long-distance migrations, and on salmonid enhancement research. Recently, he has been appointed Climate Change Co-ordinator to examine the possible impacts that global climate changes may have on the fisheries resources of western Canada. He has also been a visiting professor at Simon Fraser University and at the Bamfield Marine Station. L. Margolis is the senior scientist at the Pacific Biological Station, in Nanaimo and an adjunct professor at Simon Fraser University. Actively engaged for more than thirty-five years in research on Pacific salmon biology, his work has focused on.
