Fish, Ichthyomyzon bdellium, Ichthyomyzon greeleyi, Noturus flavus, Moxostoma breviceps, Lythrurus umbratilis, Notropis buccatus, Misgurnus anguillicaudatus, Morone americana, Lepomis cyanellus, Ammocrypta pellucida: distribution extensions

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Ligictaluridus posthon n. sp. (Monogenea: Ancyrocephalidae) from Noturus flavus Rafinesque (Siluriformes: Ictaluridae) in Ontario, Canada

As a result of further studies following the review of the genus Ligictaluridus by G. J. Klassen and M. Beverley-Burton, we propose Ligictaluridus posthon n. sp. for ancyrocephalid monogeneans found on Noturus flavus (Siluriformes: Ictaluridae) taken in Ontario. Ligictaluridus posthon is most similar to the type species, L. pricei (Mueller, 1936) Beverley-Burton, 1984 but is distinguished by a stouter penis, with a diameter to length ratio of ~1:6 (~1:18 in L. pricei), larger hamuli, and an apparent specificity for stonecats (Noturus flavus).

Effects of Control of the Sea Lamprey (Petromyzon marinus) on Migratory and Resident Fish Populations

Information from the records of the various agencies on control of the sea lamprey (Petromyzon marinus) was summarized from the early approach to control by mechanical or electrical barriers and chemical toxicants. While fish kill has been an inescapable consequence of the program, information available for migratory species has shown no large-scale detrimental effects. The only reportable instance of damage to a resident stream species has been the near loss of the stonecat (Noturus flavus) from tributaries to the southwest corner of Lake Superior, resulting from chemical treatments. Although no similar occurrences were recognized, available documentation proved inadequate to record long-term effects on these vulnerable species. As long as existing control methods continue, no matter the precautions taken, fish populations will be affected. Whether or not this remains a tenable situation is a question for this symposium and the future.Key words: weirs, chemicals, fish kills, sea lamprey, Petromyzon marinus; Catostomus catostomus, Catostomus commersoni, Noturus flavus, Salvelinus fontinalis

First Specimens of the Stonecat, Noturus flavus, from the Hudson Bay Drainage

Nine specimens of stonecat were taken in the Red River 16 km south of Winnipeg, Man. This is the only known collection of the species from the Hudson Bay drainage. Ecological factors seem to be the main influence confining the species to its present restricted northern locality.