CHESTNUT LAMPREY |
Photo by Konrad Schmidt
used by permission
Chestnut Lamprey
Ichthyomyzon castaneus
Federal Status:
None
State Status:
Threatened |
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- Range:
Dark Blue = Counties with designated critical habitat
Light Blue = Historical records
- Comments: This fish is a long-term survivor with a bizarre life-cycle. Considered
primitive because of its cartilaginous skeleton, 7-pored gill openings and lack of jaws,
the chestnut lamprey has a larval stage and a parasitic adult stage. The adult will attach
to a host fish using its disc-like sucking mouth. The host fish is most commonly a carp,
sucker, gar, freshwater drum or catfish. After feeding on body fluids of the host fish,
the lamprey releases itself and gathers to spawn in small, tributary streams. They
collectively excavate a pit where eggs are deposited. The lampreys continue to excavate
the gravel substrate upstream and thereby cover the eggs downstream. The young, sightless
larvae drift to quiet backwaters with abundant organic material and burrow into the
sediment. The larvae may remain several years before transforming to the adult stage. In
the late 1800s, the chestnut lamprey was reported from the eastern third of Kansas. Today,
the chestnut lamprey probably only exists in the Missouri River.
Other Fish on the
Kansas T&E List
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Kansas Wildlife Refuge
Text: Ed Miller and Bob Gress
Range Maps and Web Design: Jim Mason
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