[1] It is known to infect the northern pike, as well as other piscivorous fish, being found in the intestine of its host.

Adult specimens of Triaenophorus nodulosus have been seen to range from 70 to 270 mm (2.8 to 10.6 in) long.

When having a developed egg in the uterus, their maximum width is 1.5 to 4.0 mm (0.059 to 0.157 in).

[4] The eggs of the species are white, but turn brown around 45 minutes after being placed in water.

[5] Triaenophorus nodulosus has been found in a variety of fish, such as the northern pike, the coho salmon, the sockeye salmon,[6] the Great Lakes muskellunge,[7] and the walleye,[3] as well as other fish from the United States and Canada.