Wisconsin. State Conservation Committee (1915-27) / Biennial report of the State Conservation Commission of Wisconsin for the years 1915 and 1916
Ripple, R. L.
The use of gasoline in the treatment of fin trouble among brook trout, pp. 34-37 PDF (746.8 KB)
BIENNIAL REPORT 35 time the disease was at its worst, and mentioned for me to try gasoline and kerosene on the fish, and see what effect that would have upon them. The next day my good neighbor, Mr. Nourse, called me up saying that he wanted me to come over and help him make up a small crowd for an hour at his farm adjoining the hatchery, as one of University of Wisconsin men was to give a talk on the Diseases and Care of Sheep. I want to say here that I never will be sorry because of the one and one-half hours put in at that talk. The gentleman discribed the different diseases of sheep and finally came to stomach trouble and stomach worms and stated in his remarks that 2 spoonfuls of gasoline to 3 ounces of fresh cows' milk would cure and rid the sheep of worms. In my desperation in trying to do for my bunch of trout, I thought if gasoline had a killing effect on the stomach worms in sheep, why not might its uses be applied to this fin disease of my trout, as I had, of course, supposed that the fin trouble was a germ or parasite of some kind. It did not take me long to collect a half dozen of my worst affected yearling trout and place them in a quart of pure gasoline. In one minute by the watch all were quiet; the struggling of the trout was over; two more minutes elapsed, at which time they were removed to a vat of running water. After watching them several minutes without a quiver ahywhere, feeling sorry, giving them up as dead and intending trying another lot for a shorter period of time in the gasoline, I was called out on the pounds. In about 15 minutes upon my return to the hatchery, I discovered my treated trout swiming about gaily. To test their welfare, I gave them some nice fresh liver to humbly atone for the trick I had served them. To my surprise they took food readily. To my further surprise, as I happened to glance into the gasoline measure in which they had been treated, I found that the gasoline was of dirty brownish color and jelly-like, and this proved to me that something had come off those trout. The treated fish fairly glistened in coloring, they were so clean. The frayed fins turned whitish color at the diseased ends. It was not long before I treated quite a number in like manner, and kept two tanks going, one with the gasoline treated fish, and the other tank containing the salt brined trout. There was ai loss in both tanks, but much greater by far in the salted tank. As I was treating my worst cases in both instances, there was bound to be a death loss among the gasoline treated trout from those fish that were beyond any hope anyway. My experiments told me as far as I carried them that there is something to gasoline in the treatment and cleaning up of trout that should be carried out in a more scientific manner. Three minutes is the limit of time which brook trout will stand the clear gasoline, and revive in running water. The final loss of this bunch of trout was about one-half. Of those treated with gasoline, many were no doubt beyond any help at that time. Without more positive proof on my part, owing to absence of strong magnifying glasses, and proper amount of time to devote to the work, and the advanced stage of the disease when the gasoline treatment was begun, I cannot state just what results were obtained. At any rate, here is something worth further consideration in the cleaning up of trout, and in the treatment of fin trouble herein referred to, especially if started when the fin trouble is in the first stages. U I I U I I U I I U I I U I I U I I U I I U I I U I I - 0
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