These maps are here to provide a sense of spatial scale and to
help relay information on distributions of aquatic species in Yellowstone
Important features to point out from map are:
1). The West Thumb is an area of Lake Trout breeding and intense
management by the NPS.
2). Molly Islands are an important breeding ground for white pelicans.
The Islands have a protected buffer around them in which no motor
boats are allowed.
Important features to observe from this map are:
1). The open ovals are places where the NPS have tried setting
deepwater gillnets to catch lake trout.
2). Lake trout caught, represented by A’s and B’s, are dispersed
randomly throughout the lake. This shows the nomadic nature of the
lake trout and how far spread the species impact can be felt in
3). This graph is from 1994 and many more lake trout have since
Cobble, rubble, and boulder substrates on lake sides is important
for lake trout reproduction. This map shows that many kilometers
of Yellowstone Lake’s shore is suitable breeding habitat for lake
The native range of Yellowstone cutthroat trout has been reduced
dramatically. The home range has reduced due to species introductions,
loss of habitat, and hybridization with other cutthroat and rainbow
This map is important to show how introductions by man have spread
the lake trout home range well beyond its native range.
Fishing Bridge and Le Hardy Rapids are important areas for fish
viewing tourism. This section of Yellowstone River was closed to
fishing to help the recovery of the cutthroat trout.