CHAPTER XIX. 

 " FISHES. 



By 



C. W. NASH. 



THE following list includes all the fishes found 

 within a radius of ten or twelve miles from the city 

 of Toronto of which I have authentic records. 



MARSIPOBKANCHII. (The Lampreys.) 

 PETKOMYZIDAE. 



1. Silver Lamprey. Lamper Eel. IctTiyomyzon 

 concolor (Kirtland). The Silver Lamprey is abun- 

 dant in Lake Ontario, usually in deep water, but it 

 runs up the small streams to spawn in the spring. 

 It is a most destructive parasite on the large com- 

 mercial fishes, fixing itself to their bodies by means 

 of its suctorial disk and causing deep ulcerated 

 wounds at the point of attachment, which very fre- 

 quently result in death. When spawning they form 

 nests in the bed of the stream among cobble-stones 

 and pebbles ; in these the eggs are deposited, after 

 which the parent fish all die. After emerging from 

 the eggs the larvae burrow in the mud or sand near 

 the margin of the stream and there remain in the 



al condition, blind and toothless for a long period, 





