14 American Fisheries Society 



ing the pickerel by the use of copper sulphate. In most instances, 

 however, this is too large an undertaking, and here again the 

 production of a lake may be increased by the introduction of 

 yellow perch, and if the waters are of large area the pike perch 

 may prove a valuable acquisition. Some of the waters which I 

 have described are fed by trout streams and, if they are quite 

 cold, the bass or other introduced enemies of the trout may not 

 be so serious a menace to the latter, if the protective close season 

 is not applied. In such instances those most competent to judge 

 should decide upon the species, which, under existing conditions, 

 will produce the best results. 



If it is decided to specialize with trout, stock with that species 

 annually and introduce food for them if necessary. Give the 

 commissioners power to annul the close season on black bass 

 for that particular water, or have the open season the same as 

 for the trout. In other words, do not protect two antagonistic 

 species of fish in the same waters, or attempt to please the tastes 

 of both the trout fisherman and the angler for bass by restocking 

 the same waters with both species. Another way to encourage 

 the trout in such a lake and at the same time reduce the number 

 of bass, is by screening the nests of bass before the fry scatter, 

 making it possible to thereby effect their removal to suitable 

 rearing waters, or directly to waters in which it is desirable to 

 specialize with the bass. It may be that some natural trout lakes 

 contain also yellow perch. It is a very simple matter to annually 

 patrol the shallows of the lake during the spawning season of the 

 perch and to take up and transfer the spawn of the perch to 

 hatcheries, or directly to waters where it is desired to encourage the 

 perch. These suggestions with regard to the removal of bass 

 fry or perch spawn are equally applicable to other species of fish, 

 and it may readily be seen that by carrying out this policy, one is 

 not only conserving the trout, but is also conserving the young 

 or eggs of a species of fish objectionable in that particular water, 

 but very valuable in some other body of water. 



In the state which I represent, three species of trout are 

 propagated, namely, native brook trout, the German brown 

 trout and the rainbow, or steelhead trout of the Pacific Coast. 

 Experience has shown that both the brown and rainbow trout are 

 very destructive to the native trout, and yet they are a valuable 



