Ronquils are most closely related to the eelpouts and prowfish. Bothrocara is a genus of eelpouts. Aiakas is a genus of eelpouts containing two species. Petroschmidtia is a genus of eelpouts. Zoarces is a genus of eelpouts in the family Zoarcidae. Antifreeze proteins are also known from Southern Ocean snailfish and eelpouts. Pachycara is a genus of eelpouts found in Atlantic, Indian, Southern and Pacific Ocean. The eelpouts are the ray-finned fish family Zoarcidae. Viviparous eelpouts grow to a maximum length of and a maximum weight of .