Which of the following human activities results in the loss of genetic diversity in fishes?

Hatcheries can reduce genetic diversity in fishes when breeding relies on a limited captive broodstock, leading to inbreeding, genetic drift, and domestication selection when stocked fish interbreed with wild populations. Fishways maintain river connectivity and natural gene flow, sanctuaries protect wild breeding stocks in their habitats, and biomonitoring assesses aquatic populations without altering their gene pool.