What type of fish feeds parasitically on other fish?

The type of fish that feeds parasitically on other fish includes species like the lamprey and certain types of catfish. Lampreys attach to their host fish using a sucker-like mouth and feed on their blood and bodily fluids. Some catfish, such as the candiru, are known to invade the gills of other fish and consume their tissues. These parasitic feeding behaviors can have significant impacts on the health of host fish populations.