STREAM DRIFT OF NEWLY HATCHED SEA LAMPREYS IN THE UPPER DELAWARE RIVER

We evaluated stream drift of newly hatched sea lamprey (Petromyzon marinus Linnaeus) ammocoetes over a 2-year period on the mid-to-upper Delaware River. Ammocoetes were collected using four gear types in five different habitats. Turbidity, current velocity, river depth, sample depth, temperature, an...

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Bibliographic Details
Published in:Journal of the Pennsylvania Academy of Science 1995-08, Vol.69 (1), p.7-9
Main Authors: BENNETT, RANDY M., ROSS, ROBERT M.
Format: Article
Language:English
Subjects:
Animal nesting
BIOLOGY
Burrows
Freshwater fishes
Habitats
Larvae
Ocean currents
Oxygen
Riverine habitats
Seas
Turbidity
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Summary:We evaluated stream drift of newly hatched sea lamprey (Petromyzon marinus Linnaeus) ammocoetes over a 2-year period on the mid-to-upper Delaware River. Ammocoetes were collected using four gear types in five different habitats. Turbidity, current velocity, river depth, sample depth, temperature, and dissolved oxygen were simultaneously recorded in each habitat. Relations among ammocoete density, habitats, and physical variables were determined by regression and analysis of variance. These analyses showed no differences in ammocoete density among five different habitats sampled: riffles, riffle pools, riffle eddies, pools, and channels. This wide range of habitat use indicates that early larval ammocoetes merely drift and do not use particular habitats between up-river spawning sites and down-river burrowing sites.
ISSN:1044-6753
2475-1898