1!)0 Thirlij-si.rlk Ainuml MccUikj 



the results of stockin.ir is sii])|)lcinciil(Ml hy I he further laek of 

 iiifoi-ni:iti(»n alioul llie iiaiui'al food of the re,-:-ions to be stoekeci, 

 an. I lliat, of course, is an old siorv. Also, about the kind of fish 

 lliat iuhaliil the waters, we want to stock. 



We have had a .ureat deal of dilllculty from illegal fishing, 

 tliat 's to say. ihegal nelling. which depiaves us. wo are sure, of 

 a giviii many nude lish in ( 'anandaigua. Placid, and some other 

 iidand lakes, (ienei'ally tlie A\hilellsh netters get in their work 

 before we gel on the field, and they take the mah's. because the 

 males ruii first, and in that way, we have been nnable to get 

 snthcient milt. Hnndreds and hundreds of ripe females have 

 been lost for want of milt. 



Of conrse there have l)een tlsh ])ai-asites, especially the com- 

 mon ])arasite, which you all know as the gill louse ])arasite, 

 which has atfectecl the brooktrout in the Adirondacks and by nn- 

 fortnnate chance has been introduced into other waters, liy the 

 bringing of adnlt fish from the Adirondacks into other waters. 

 You may say, of course, that the messenger should know better 

 than to transport fish afflicted wdth gill infection, but we are 

 dealing with a fact and not a theory. As you know, the para- 

 site becomes firmly attached to the gills of brook trout, and 

 whenever it has become attached in sufficient numbers it in- 

 variably kills the fish when they are two or three years old. It 

 does not attack young fish at all. Now the only remedy that has 

 been suggested for this parasite is one that has to deal with the 

 young form of the parasite, that is the swimming larvae. The 

 remedy is a different swimming fish, say for instance like the 

 fresh water killifish, or the top swimmer, any little fish that will 

 swim at the surface, such as the sheep's head killifish or any 

 iish of that kind w'hich will live in the cold trout waters will 

 answer the purpose of feeding on the swimming larvae so that 

 there will not be enough to kill any fish, and thereby the disease 

 is kept in check. 



Fish diseases. We have had a number of very fatal diseases 

 to overcome, and we have been able, fortunately, to handle some 

 of them. One is the well known ulcer disease or furunculosis of 

 the brown trout, which prevailed to such an extent at one of our 

 stations as to carrv oft' all the brood stock. That has been en- 



