Cutthroat Trout
Posted: Wed Oct 13, 2010 8:19 am
General description: Coastal cutthroat trout are silver, brassy, or yellowish in color and have small densely packed irregularly shaped dark brown or black spots on their body, head, and fins. Juvenile coastal cutthroat trout range in size from 1 to 6 inches and have about 10 oval parr marks overlaid with small black spots and may have a faint red or pink coloration along the lateral line and possibly on the gill covers. Typically the distinguishing cutthroat “cut-slash” is present on Alaskan coastal cutthroat trout as a red or orange band of color on the underside of the lower jaw in the skin folds. However, not all coastal cutthroat trout have a distinct slash, especially the silver colored sea-run fish which have just returned to freshwater where the slash may be present but inconspicuous. Coastal cutthroat trout can spawn with rainbow trout and produce fertile hybrids with physical characteristics of both (i.e., cutthroat slash and pink/red color band along the lateral line). Biologists often use the presence of small teeth at the base of the tongue called basibranchial teeth as a means to distinguish between rainbow trout (teeth absent) coastal cutthroat trout (teeth present). However, the presence or absence of basibranchial teeth is not a 100% accurate means of positively distinguishing all coastal cutthroat trout from all rainbow trout and this distinguishing trait may be further complicated in the presence of hybrid trout. Coastal cutthroat trout, like other species of trout, reportedly have the ability to change the size, shape, and distribution of spots in relationship to the environment they live in.
http://www.adfg.state.ak.us/pubs/notebo ... Etrout.php
http://www.adfg.state.ak.us/pubs/notebo ... Etrout.php