Ecological Interactions between Wild and Hatchery Salmonids

While there has been a long history of salmon hatchery operations throughout the North Pacific, only recently have we begun to investigate how hatchery salmon interact with their wild counterparts. This volume represents our latest understanding of the scale and magnitude of effects of hatcheries on wild salmon populations, and begins to lay the groundwork for precautionary fisheries management to ensure that wild salmon are conserved. Reprinted from Environmental Biology of Fishes volume 94 issue 1

Research on hatchery and wild salmonid interactions is increasing exponentially and this book provides a synthesis of what researchers believe today. Of greatest importance is that it shows how little we know. Mart Gross, University of Toronto, Canada

Wild and hatchery salmon interactions are key to understanding human impacts on the North Pacific ecosystem. This publication represents an important step in understanding both the benefits and the risks. - Vladimir Radchenko, Pacific Scientific Research Fisheries Center, TINRO Center, Russia

Through careful case histories, creative manipulative experiments, and impressive quantitative modeling, scientists and managers have come together to publish this touchstone work, work simply indispensable to our continuing efforts to "bring the salmon back". - Roy Stein, Ohio State University, USA

This book will become required reading for scientists and managers around the world dedicated to the conservation of wild salmon. - Hideaki Kudo, Hokkaido University, Japan

1. Ecological interactions between wild and hatchery salmonids: an introduction to the special issue. -2. Mechanisms influencing competition between hatchery and wild juvenile anadromous Pacific salmonids in fresh water and their relative competitive abilities. - 3. Predation by hatchery yearling salmonids on wild subyearling salmonids in the freshwater environment: A review of studies, two case histories, and implications for management, - 4. Development of natural growth regimes for hatchery-reared steelhead to reduce residualism, fitness loss, and negative ecological interactions. - 5. PCD Risk 1: A tool for assessing and reducing ecological risks of hatchery operations in freshwater. - 6. Risk management of non-target fish taxa in the Yakima River Watershed associated with hatchery salmon supplementation. - 7. Ecological risk assessment of multiple hatchery programs in the upper Columbia watershed using Delphi and modeling approaches. - 8. Lack of trophic competition among wild and hatchery juvenile chum salmon during early marine residence in Taku Inlet, Southeast Alaska. - 9. Spatial and trophic overlap of marked and unmarked Columbia River Basin spring Chinook salmon during early marine residence with implications for competition between hatchery and naturally produced fish10. - Wild chinook salmon survive better than hatchery salmon in a period of poor production.