When bass are babies they
eat what shad eat plankton. Shad over compete with the bass bluegill crappie fry. So you have a high death rate in your classes of fish or they are stunned. Southern Indiana's winters do not usually cause a very high rate in shad kills so the DNR stock lakes with a high population of shad with walleyes stripers and hybrids to help control the population . so I have been told I am no biologist.