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barrier

A barrier is a type of structure (physical, chemical, biological) that blocks the migration or spreading of aquatic organisms. Milltown Dam is an example of a physical structure that prevents the migrations of many of Montana's native species, including westslope cutthroat trout, bull trout, and largescale suckers. Natural barriers, such as waterfalls and streams that do not flow year-round, also block movements.

boulder

Substrate particles greater than 25 cm in size.

burst rate

The amount of time between radio transmitter signals. The transmitters we use have a five second burst rate , so every five seconds they send out a signal.