To raise awareness of the conservation of sharks, small-spotted catsharks (Scyliorhinus canicula) have been raised from eggs in the public aquaria Havets Hus in Lysekil, Sweden, and since 2003 released as 2-4 year olds into Gullmarfjorden in the Skagerrak sea. The fate of the released sharks is largely unknown. By using acoustic telemetry, this study aims to track released catsharks in the Gullmarsfjord and along the Swedish west coast to better understand the behaviour and survival of these hatchery-reared catsharks. The Department of Wildlife, Fish, and Environmental Studies at the Swedish University of Agricultural Sciences manages this work.