BI256 : Fishes.docx
Document Summary
Myxini hagfishes: entirely marine scavengers and predators, prominent external features: o o o o of pores o. Class petromyzontida lampreys (cid:224) these things are going to haunt my dreams. dorsal fin gill openings: caudal and dorsal fin, eyes and lateral line system (senses low frequency vibrations of prey) well. 7 gill openings developed: prominent oral disk with numerous tooth like plates of keratin, oral disk attaches primarily by suction but also with teeth, lingual cartilage and tongue muscles protrude tongue, rasping erodes tissue which is ingested along with body fluids, when attached, water is pumped in and out of gill openings. Lampreys freshwater rivers/streams to spawn (reproduce: anadromous: migrate from sea to freshwater, or from a large body of water to, this migration requires the ability to osmoregulate internal fluids (cid:224) euryhaline, lamprey plasma is hyposmotic relative to seawater & hyperosmotic relative to.
