Warmer water temperatures trigger spawning activity for many of Indiana’s native fish species. These activities require a lot of energy and can weaken fish, leaving them susceptible to infections from diseases or parasites that can eventually kill them. Spawning activities can last for weeks and large numbers of fish may die. However, these events rarely have a lasting effect on the population.
If you find a large number of dead fish of several species or sizes, or a pollutant is suspected, please contact the Indiana DNR TIP line at 800-847-4367 or the Indiana Emergency Spill Line at 888-233-7745 or 317-233-7745.
Find more information on fish die-offs within our Indiana Fish Pond Management guide.