Because the Pysht River, like the Hoko River, is brushy, full of
snags, and often carries
tannin stained water, it is known as a "cedar creek". The river supports nine species of freshwater fish, five
salmonid and four non-salmonid. The non-salmonids known to be found in the Pysht River include
Pacific lamprey (
Lampetra tridentata),
three-spined stickleback (
Gasterosteus aculeatus), and two
freshwater sculpin species: coastrange sculpin (
Cottus aleuticus) and prickly sculpin (
Cottus asper). Salmonid species include
chinook salmon (
Oncorhynchus tshawytscha),
coho salmon (
Oncorhynchus kisutch),
chum salmon (
Oncorhynchus keta), sea-run
coastal cutthroat trout (
Oncorhynchus clarki clarki), and
steelhead (
Oncorhynchus mykiss irideus). Other fish species are likely to be present in the river's estuary, but which have not been formally sampled, include
starry flounder,
surf perches, and
smelts. Historically the
anadromous salmonid fish runs were robust but all have declined, especially the
main stem-dependent chinook and chum salmon. Chinook salmon may no longer be viable in the Pysht watershed and the few that are still seen may be strays from nearby populations such as the Hoko River stock. The causes of habitat degradation are thought to have resulted from logging, highway and railroad construction, log transport, and channelization. Other causes of population decline include fishing and disease caused by hatchery supplementation of salmonides. The large estuary is an important salmon rearing habitat. It has recovered somewhat from past heavy impacts, but active restoration efforts may be required to prevent further population declines. Before commercial logging, the forests of the lower Pysht River watershed featured large-diameter stands of Sitka spruce (
Picea sitchensis),
Douglas-fir (
Pseudotsuga menziesii), western hemlock (
Tsuga heterophylla), and western red cedar (
Thuja plicata). Deciduous trees such as red alder (
Alnus rubra) and big-leaf maple (
Acer macrophyllum) were present to a lesser degree. Today nearly the entire basin is industrial forest and subject to repeated logging. Most trees are less than thirty years old. ==River modifications==