FISHERIES, GAME AND FORESTS. 24 1 



temperature rose to above fifty degrees Fahrenheit, and the records show increased 

 numbers of lampreys running then; but on the 18th of May the temperature of 

 the water fell to forty-six degrees Fahrenheit, and there was a decided cessation in 

 the running. 



15. Brook Lamprey (Lampetra wilderi Jordan and Evermann). — At the time work 

 was commenced on the weir (April 9), transforming Brook Lampreys were seen 

 partly out of the sand all along this part of the stream, and their nests were soon 

 crowded with them, both above and below the trap. The very small number of these 

 creatures actually caught (only ten) in the weir would appear to indicate that, through 

 the spawning of many generations on the same sand-bars in which they lived as 

 larvae, they have practically lost the migratory instinct. 



SUMMARY OF THE SPECIES OF TRUE FISHES IN WEIR. 



226. Bullhead or horned pout {Ameiurus nebulosus Le Sueur). — Seventy-six caught. 

 These fishes spawn in this region during the early part of the month of June, and it 

 can be observed that it was at this time that nearly all of the specimens were 

 captured. Some of the adults were doubtless on their way up to some lagoons near 

 the Inlet to spawn, but most of those captured, especially of the thirty taken on 

 June 9th, were immature. This would indicate that the migratory instinct impels 

 fishes that are not mature as well as those that are, and from this we could infer that 

 a search for spawning grounds is not the only motive in " running." It may also be 

 due to a desire to change feeding grounds or conditions of water. 



300. White suckers (Catostoiius commersonii Lacepede). — Ninety caught — thirty- 

 five males, thirty-seven females, and eighteen sex undetermined. The undetermined 

 suckers were small and immature, and these, with the young of nearly all other species 

 of fishes, show a distinct tendency to " run " at the time when older specimens of the 

 same kind are spawning. It is seen that, compared with the time of spawning of the 

 lampreys, the bullheads are late, while the suckers are early. A few female suckers 

 that had entirely spawned out were caught still pressing on up stream. The "run" of 

 these fishes commenced about the last of March and ended at the middle of May. 



362. Black-headed minnow {Pimephales notatus Rafinesque). — But four caught. 

 Many others are to be found here at times. 



3O8. Horned dace (Seinotilus atroniaculatus Mitchill). — Fourteen caught, most in 

 the month of June. 



410. Golden shiner or bream {Abramis chrysoleucas Mitchill). — Twelve caught. 



443. Shiner {Notropis hudsonius Clinton). — Seventy-three caught, most in the first 

 half of June. 

 16 



