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)
34 WISCONSIN CONSERVATION COMMISSION THE USE OF GASOLINE IN THE TREATMENT OF FIN TROUBLE AMONG BROOK TROUT. By B. L. RIPPLE. During the month of April at the Bayfield Hatchery, there developed a certain fin trouble or disease among several thousand of our brook trout yearlings, a disease with which all fish culturists have come in con- tact with more or less. The quarters and conditions under which these particular trout were kept and had wintered were ideal, except that the space was somewhat limited and perhaps a little crowded. This fin trouble or disease, if it should be called such, was, in my opinion, caused in some way owing to said close quarters. Many thousands of trout of same age and size, from same eggs and stock fish, were wintered in the same water conditions, but with more ample space and with no bad results, and are a grand lot of trout at this time. When this fin trouble was first noticed, the very tips of the different fins, and tail as well, were slightly frayed, reddish in color and inflamed, the dorsal fin being in all cases more badly affected as the trouble advanced. The trout, although in the above sore condition, never failed to eat and eat well up to the time they fell off and died. As stated above, the disease advanced more rapidly on the dorsal fin and when this fin became affected down to the body of the fish, that trout died. The strongest trout among this affected bunch seemed to throw off the disease and become little the worse for it, except that the dorsal fin would heal over and become only a short stub, the same being true also with other fins and tail. At the first realization of this trouble, I removed and started cleaning up all the affected fish by salt brining and changing quarters, but I soon found that the old method of salting trout was of no avail in this instance, but only hastened their death by keeping the soreness inflamed. I had removed 500 or 600 of the very worst affected trout to one of the hatchery tanks to prove to myself whether or not the salting operations were really of no avail. Here the water could be drawn down at will and different amounts of water and salt brine strength were tried, but the trout fell off very rapidly. The disease had advanced at that time beyond where any salting or cleaning up by that method, either in weak or strong solution, would do any good. Several other things were tried and still the trout died. Any one who loves his work and that which falls under his personal care, as most hatchery men do, can appreciate the fact that there was nothing left undone in trying to save my little bunch of "speckled beauties." Commissioner Nevin visited the hatchery on Sunday at the U I I S I I S I I S I I S I I S I I S I I S I I S I I
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