Fish and Game develops a new way to control fish populations

Fish and Game develops a new way to control fish populations winning a national award for fisheries restoration. Field reporter Susan Allen has more with the details.

According to an article put forward by Roger Phillips, Public Information Specialist for Idaho Fish and Game.

Fish and Game researchers and hatchery staff are working together on a project using 50 year-old technology to develop a monosex fish population whose offspring can only produce males. These males have two YY chromosomes (YY) rather than the usual XY arrangement.

Stocking YY-male hatchery fish into a body of water with an undesired fish population could change the sex ratio to all males within a few generations, and the unwanted fish population would eventually fail to reproduce and therefore die off. Once accomplished, Fish and Game would stop stocking those fish and fisheries managers would then restock that body of water with a more desirable fish species.

Brook trout were selected for the first YY project because they are short lived and quick to sexually mature, which enables researchers to rapidly produce the hatchery broodstock and test the technique in a natural environment. Brook trout are also good candidates because they are nonnative, frequently overpopulate, and stunt in both lakes and streams, which means fish are too small to be of interest for most anglers.