|
|
|
The Chinook Salmon, Freshwater Phase.
The top fish is a male; the bottom fish a female.
Background
This web
page demonstrates how simulation might be used in fishery management.
Fisheries have declined in the Pacific Northwest and around the world.
You will learn how previous simulation models have been used to help
managers deal with the many factors contributing to the decline. Both
models include an interactive exercise to place you in the role of
fishery manager .
The declining salmon runs on the Snake and Columbia river
system is one of the most serious environmental problems in the Pacific Northwest. The
salmon have disappeared from 40% of their historical breeding ranges despite a public
and private investment of more than $1 billion. The annual salmon
and steelhead runs have dwindled to 2.5 million, less than
a quarter of the run sizes of 100 years ago. This web site provides
two models which may be used to simulate parts of the complex
and threatened salmon system. The Tucannon Harvesting Model simulates the
long term trends in the population over successive generations in the
Tucannon River. It is then used to simulate the impact of land use
development, hydro electric development and harvesting. The Tucannon model illustrates the value
of building more than one model of the same system. As a long-term
model of the entire population, it serves as a natural accompaniment
to the first, short-term model.
There are
several Northwest planning processes underway for the recovery of fish
runs. One of the latest publications is the "Conservation of Columbia
Basin Fish," dated July 27, 2000, more commonly called the "All-H
Study." The H's are improvements to either Fish Harvest, Hatcheries,
Habitat, or the Hydro system for the recovery of fish runs in the
Columbia River basin. The executive summary is provided below and
links for more information can be found on the Internet at BPA's Environment, Fish and Wildlife web page for the Federal Caucus.
Main
Menu
(hyperlinks to information and
resources)
Background on Salmon
Migration *
Executive Summary from
the All-H Planning Process (PDF file)
Other
Resources:
* Chapter references are excerpted from "Modeling the Environment: An Introduction to System Dynamics Modeling of Environmental Systems" by Andrew Ford. Copyright © 1999 by Island Press. Posted to this website by permission of Island Press. All rights reserved.
Feedback
Click on
the Envelope Icon to Email your Comments to
BPA
Tell Us:
Please include your name, school,
grade and teacher's name.
Thanks for your interest. We hope you
have found this useful and interesting.