Jeffrey Hahn, Asst. Extension Entomologist
A hellgrammite lives in running fresh water, such as streams or rivers, often hiding around rocks or debris. They are predaceous, feeding on insects and other aquatic invertebrates. They have the interesting ability of being able to swim backwards as well as forward. It is generally believed that they take one to three years before crawling out onto dry land to finish their development. They will usually create a cell in the soil near the water to pupate. They are sometimes used by fishermen as bait.