Education

The Four H's

Introduction

Trout Unlimited groups the threats to coldwater fisheries into four broad categories, which, by coincidence, all start with "H":

• Habitat covers water pollution, the physical condition of stream channels, habitat damage caused by small dams, irrigation withdrawals and other diversions, and other aquatic habitat needs
• Hydropower deals with the stream flows and fish migration problems associated with hydroelectric dams
• Harvest covers the balance between wild fish sustainability and commercial and recreational harvest
• Hatcheries encompasses all the direct and indirect threats posed by artificial propagation of fish, including genetic, ecological and economic issues

The links above have a brief description of each "H," an example of some of the specific problems associated with each, and an example of how TU is providing solutions to those problems.