A new study by Colorado Parks and Wildlife researchers suggests man-made whitewater parks that create “play waves” for kayakers and other recreationists are having a negative impact on fish passage. … The study, published in the peer-reviewed journal “River Research and Applications,” looked at two white water parks that have incorporated fish passage structures into the design. … [A]dult trout appeared to make it upstream past the whitewater park while fewer juvenile trout succeeded in doing so. There was also a higher concentration of suckers below the structure than above it, suggesting the park could be impacting the suckers’ movement.

Other fish restoration news:

• California WaterBlog: Fish eye view​