. Annual report . lt treatment so well known to all fish culturists. Under thechapter descriptive of the State fish ponds at Caledonia reference hasbeen made to a gill parasite of the brook trout, the fish louse introducedfrom Adirondack waters. So destructive is this parasite and so persistentwhen once introduced that it has rendered the holding of brood troutof this species practically impossible at Caledonia, at least in hatcherywaters. Singularly enough, the brown trout and rainbow trout are never affectedand appear to be wholly immune from attacks of this copepod. On July18, 1906, at Sara
. Annual report . lt treatment so well known to all fish culturists. Under thechapter descriptive of the State fish ponds at Caledonia reference hasbeen made to a gill parasite of the brook trout, the fish louse introducedfrom Adirondack waters. So destructive is this parasite and so persistentwhen once introduced that it has rendered the holding of brood troutof this species practically impossible at Caledonia, at least in hatcherywaters. Singularly enough, the brown trout and rainbow trout are never affectedand appear to be wholly immune from attacks of this copepod. On July18, 1906, at Saranac Inn, brook trout fingerlings were dying from no apparentdisease. Foreman Winchester stated that they commenced whirling andboring in a circle, nnallv dropping to the bottom on the side, continuingthis for some time until death resulted. The loss in one of the pondsmost seriously affected was 250 fingerlings out of 20,000 to 25,000 finger-lings in twenty-four hours. This would seem to indicate a nervous disease. (/) D z 7 J DhIhI0J< < 1 111 Q Z D 0 J FOREST, FISH AXD GAME COMMISSIONER. 203 quite beyond the control of fish culturists. At Caledonia a few of the brooktrout sent for examination show defective gills and imperfect tails — thelatter resulting either from nibbling or from the attack of the fungus. It isnoteworthy that this condition arose during a season of drought, and musthave been due to insufficient water supply and overcrowding. The losses in transportation were sometimes very serious. For example,in March. 1906, 50,000 fry were shipped from Saranac Inn to the PleasantValley station, and the mortality in transit was unusually heavy. Thesefry were in such a stage of development as to make their transfer ratherdifficult, and it is thought that the method of aerating the water en route,viz.: by the use of a dipper lifting a quantity of water above the surfaceand letting it fall through the air, ma}- have been the principal cause ofthe losses. Gill Paras
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforests, bookyear1902
