-3- 



Now, we "begin to clear up tho mystery of the disa;j)pcarance 

 of the yoxmg trout. When we look beneath the surface of the water, we 

 see a fierce struggle for existence between the various and s'OTidry deni- 

 zens of tho cool depths. It is fish eat fish. 



Studies of trout streams by the Biological Board of Canada shov; 

 that the greatest losses in trout fry are caused by enemy or co;.ipetitor 

 fishes. 



After hatching, the little fishes are frequently decimated by 

 cannibalistic attacks. And none are worse cannibals than the trout and 

 other gane fishes tha:iselves. There among the enemy fishes and fcther 

 enemies you v/ill find the prime cause of the disappearance of the baby 

 trout. 



As for the great blue heron and other fishr-eating birds, Mr, 

 McAtee gives it as his v/ell considered judgment from the facts, that 

 in most cases they more than make up for the haxn done in eating val'uable 

 fishes by their destruction of the natural enemies of the v/hole fish tribe. 



So you see the great blue heron is not guilty as charged, V/hen he 

 was seen hanging aaround the trout stream he may have been engaged in act'oally 

 h3 Iping, not hurting, the trout fishing. 



AT.COUICg.n :. ::? ; our Wilds Man will be back from another visit with Uncle 

 Sam's Isaturalists this day two weeks hence. At that tine, this Station — 

 will again cooperate with the Iftiited States Department of Agriculture by 

 giving you amother of these glimpses behind the scenes of ITature. 



