Gibrien gives you container of fingerlings to release. There are four varieties, and the one you get is random. When you are near the release location the fingerlings will automatically release; you may have to swim to release them.
Release crappie fingerlings where the Upper Emerald River flows out of Emerald Lake around -740, 36, 227.
Release freshwater salmon fingerlings in the pond at Tunares Sapling around -64,-10,61.
Release catfish fingerlings in Emerald Lake around -766,37,254.
Release fathead fingerlings in Opal Pond around 167, 2, 82).