Attracting carp so their presence can be accurately assessed

Project manager: Peter Sorensen

Funded by: Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources

Note: This project is the combined second phase of three previous projects: Developing food attractants for silver carp that can be used to induce aggregation and control them, Testing whether carp can be located using Judas fish: a new behavioral tool to locate aggregating invasive fish so they might be tracked and/or removed, and Determining the ability of two approaches to measure eDNA to reliably quantify the abundance of invasive common carp in Minnesota lakes.

Description: MAISRC researchers are currently working to prevent adult bigheaded (Asian) carp from migrating upstream from the lower Mississippi River using acoustic deterrents and modifying gate operations. Because this needs to be very strategic and efficient, MAISRC must have extremely accurate information on the abundance of adult invasive carp in the area.

This project aims to remedy the deficiencies currently associated with eDNA by developing new techniques to cause predictable aggregations of adult invasive carps. This will facilitate their accurate measurement using eDNA and pheromones or alternately their being trapped and removed.

This research will examine the possibility of causing aggregations using both sexual and feeding cues.

In order to develop reliable and practical ways of using sexual stimuli to find carp, researchers will artificially induce female sexual behavior and sex pheromone release using hormone implants. They will then determine if they can track these aggregations using eDNA measurements and sex pheromone concentrations. They will also test the possibility that a Judas fish (a sterilized fish equipped with a tracking device) could be used both to drive an aggregation and/or track it. Additionally, researchers will test whether food or a synthesized compound could drive aggregations of carp.

Project start date: 2015

Estimated project end date: 2018


Following data collection in 2015, it was found that food was able to drive large aggregations of common carp which we successfully measured using eDNA and pheromones. This baiting scheme has now been perfected and in some cases, a third of the population of mature common carp were able to be attracted using food, all while measuring abundance with a new level of sensitivity, precision, and accuracy. Pheromone-releasing Judas fish were also evaluated for their ability to attract other carp. This research has now informed a pilot study of attracting Silver carp in Illinois using both methods.