Main Page | See live article | Alphabetical index In fisheries science, by-catch refers to species caught in a fishery intended to target another species, as well as reproductively-immature juveniles of the target species. By-catch is a serious issue that can contribute to species endangerment. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.