102 American Fisheries Society. 



Mr. Cobb: It was a rock bottom. I may say that with extremely 

 high water the swift current extends further down and sometimes 

 reaches an accumulation of mud; and the fish will even spawn right on 

 the mud bank if the swift current ends down there. Of course, that 

 takes place only once in a long time. 



Dr. Embody: The disturbed condition of the water seems to be the 

 primary factor. If that is the case, would they not spawn in the lake 

 itself? 



Mr. Cobb: They do, but our work is confined almost entirely to 

 streams, because a large part of our fish do spawn in the streams, and 

 where you can get a run passing one way in a stream you can do a great 

 deal more business with the same amount of money and men than you 

 can out in the open lake. But they do spawn in the lake quite frequently. 

 Dr, Embody: I was interested to know if they did actually spawn 

 in the lake. Or whether a stream was actually necessary. That might 

 throw some light on the type of lake in which we ought to introduce pike- 

 perch. 



Mr. Cobb: I have seen a heavy run in Pike River driven back by 

 snow. We had about a foot of heavy, wet snow. The water temperature 

 went down to freezing point, and the pike left the river. The bay in- 

 the river at that time was free from ice, and we found that the pike were 

 on the north shore of the lake, where the shore consists largely of broken 

 rocks. They were spawning where the waves were breaking over the 

 broken rocks, a good way from shore. They did not go back to the stream 

 that year. 



Mr. Downing : When the female fish break water and extrude eggs 

 at the same time, is the male with them? 



Mr. Cobb: In some cases yes, and in some cases no. We have 

 taken chunks of eggs that would fill a jar when you came to separate 

 them — eggs some six to eight inches deep, over a space 175 feet across. 

 On one occasion the pike were spawning all night; but a search in the 

 morning would show the bottom clean. The same thing was repeated 

 three days in succession, and at the end there were no eggs there except, 

 crobably, a few that you could find in the crevices of the rock. 



Mb. Downing: The moral is to dispose of your suckers. 



Mr. Cobb: We have given large numbers of them away for many 

 years. 



Mr. Hare: Have you any idea of the percentage that were fertil- 

 ized among those you took from the bottom of the stream? 



Mr. Cobb: We were not equipped to determine the fertilization, 

 but we have made a good many attempts to hatch them. The whole 

 thing needs more scientific study in order to arrive at definite conclu- 

 sions. We never hatched a fish from eggs taken in that way. 



Mr. Titcomb: Did you find any egg-bound fish among those that 

 were turned back by change of temperature; or did you look for that? 



Mr. Cobb: I have never found any in such cases. 



Mr. Titcomb: In reference to Dr. Embody 's question with regard 

 to the movements of pike-perch in connection with their spawning habits, 



