8064 - Laserfiche WebLink

Home Browse Search

White River. The increased catch rate also reflects another relatively large group of subadult fish entering the population. Size Distribution The length-frequency distributions in the Green and Colorado rivers reflect another group of small fish in the lower portions of both rivers (Figures 13, 14). Median length dropped slightly in both years reflecting the abundance of the smaller fish. Fish less than 200 mm long were caught in both the Green and Colorado rivers. The largest fish caught in the Colorado River was 636 and. the largest in the Green River was 800 mm long. Median length increased slightly in the Xampa River and stayed about even in the White River. The Yampa population continues to be composed of large, adult fish ranging between 552 and 774 mm total length. The White River population is more variable ranging between 266 and 858 mm. ~mpatric S ies Native Species-One razorback sucker was collected in each of reaches 2 and 4 of the Green River and Reach 13 of the White River (Table B-4). Razorback sucker are routinely captured from Reach 2 and other parts of the middle Green River, but their capture in reaches 4 and 13 is more unusual. A total of eight additional razorbacks have been collected from the lower Green River (reaches 4 and 5), but only one other razorback sucker has been captured during ISMP from the White River. It is important to note that these fish were collected incidentally to sampling for Colorado squawfish. This portion of ISMP is not designed as population monitoring for razorback sucker. Introduced Species-Northern pike continued to be observed in relatively high numbers in the Yampa and upper Green Rivers (Table B-4). A total of 11 northern pike were observed in the upper Green and 29 were observed in the Yampa River. These numbers are lower than 1995 when 29 were captured in the Green and 57 were captured in the Yampa. Thirteen smallmouth bass were collected from the Green River and 35 were collected from the Yampa River (Table B-4; compared with 33 and 89, respectively, in 1995). Eleven largemouth bass and three walleye were caught in the Colorado River. Six walleye were also caught in the Green River. 20