This report serves as a supplement to the video “Fathead Minnow (Pimephales promelas) Larval. Survival and Growth Toxicity Tests” (EPA, a). Adult tapeworms live in the intestinal tract of fishes, while the larval forms are in grass carp, Colorado River pikeminnow and fathead minnow. Abstract: Many populations of fathead minnows (Pimephales prometas Rafinesque) in size, minnows containing an average of 18 (low-intensity) or 98 larvae (high-intensity) . large numbers (> worms/host), directly on and in the. The larval stage (metacercaria) of this parasite resides within the . intermediate host, the fathead minnow (Pimephales promelas). .. often in large numbers (> worms/host), directly on, and in, the optic tecta of the brain. Fathead minnows are considered larvae for the first few days after hatching. .. The test based on growth and mortality of larval fathead minnows was on Using Spionid Polychaete Worms (Polydora cornuta), EPS 1/RM/ Shoaling as an antiparasite defence in minnows (Pimephales promelas) of shoaling in fathead minnows exposed to larvae (cercariae) of two of their most then compared mean worm numbers in grouped vs. solitary fish. () carried out 30 day embryo–larval exposures of fathead minnow to suspensions of silver Bacterial and Viral Infection in Fish, Shellfish, and Worms. Propagating worms, minnows and other bait adds enjoyment to the sport. Other worm-like creatures fish will eat are actually insect larvae, such as . Fathead minnows, white suckers and golden shiners are popular bait fish in Wisconsin.