Provincetown Center for Coastal Studies

35 Years of Research & Education

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    Jawless Fish

     
         
     

    the face of the sea lamprey

    The Cyclostomes are relatively primitive fishes that outwardly look like eels. They have cartilaginous skeletons, no jaws, skulls that hardly differ from the rest of the vertebrae, neither pectoral fins nor ribs. Two species live on the Bank, but are very rarely seen. Due to their food habits, neither will take hooks or are rarely hauled in by nets. 

      

    The sea lamprey, Petromyzon marinus is an active, voracious predator of other fish. It has a long (2 feet or 60 cm) sleek design headed by a flattened disk ringed with inward curving teeth. They chase and suck onto the bodies of a variety of fish (i.e.: cod, herring, basking sharks) and rasp through the scales and skin, consuming the bodily fluids of the host. 

    Sea lamprey are anadramous, running up rivers to spawn on gravel bottoms and die. The young spend a few years in freshwater mud habitats before moving on to sea. 

     

    hagfish

    The hagfish, Myxine glutinosa, spends long periods burrowed in clay or mud bottoms along cold water currents. Lacking external eyes, four pairs of olfactory barbels probe the currents for dead or dying fish. The tongue is modified into long pad of incurved teeth that everts to penetrate the body cavity of its food giving it access to the intestines and meat. 

    They are rarely seen, except when they have attacked hooked or netted fish. Surprisingly, there is a growing industry that harvests hagsish within the Gulf of Maine. Often using heavy buckets with a funnelled opening strung together along a heavy line, they are mainly gathered for Asian markets to be used for the leather industry. Perhaps as a defense, it can pour gallons of mucous from glands on either side of the abdomen.

     
     


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