The segmented structures in a fin that provide support.
A young or small fish, especially a young salmon or trout.
A fish that hatches in a small tributary, rears there for 1-4 years, and then migrates out to a
larger river to mature. The fish then migrates back to the tributary to spawn.
Ice formed in the
water column in very
cold temperatures. Frazil ice typically forms in shallow
riffles where most of the
heat in a stream is lost.
Small fish, especially young, recently hatched fish.
A streamlined body shape typical of most salmonines (trout, salmon and whitefish) which
consists of a body which is taller than it is wide. This "torpedo" shape reduces resistance in the
current allowing trout to hold position in a stream. An example of a fish with a non-fusiform body
shape is the largescale sucker.