The artificial propagation of the rainbow trout . the use of water. In rearing-ponds more water is required,as the circulation is not so good aud the outdoor exposure will cause the temperature torise, [f water is plentiful 1 would double the amounts stated above for pond-culture. Diseases of trout fry <ui<l remedies to be applied.—The most common diseases oftrout fry are the inflammation of their gills and a slimy and itching skin Of which I believe are chieflj caused by impure water. The diseases maybecaused by muddy water or from the foul and milk] water produced in feedi
The artificial propagation of the rainbow trout . the use of water. In rearing-ponds more water is required,as the circulation is not so good aud the outdoor exposure will cause the temperature torise, [f water is plentiful 1 would double the amounts stated above for pond-culture. Diseases of trout fry <ui<l remedies to be applied.—The most common diseases oftrout fry are the inflammation of their gills and a slimy and itching skin Of which I believe are chieflj caused by impure water. The diseases maybecaused by muddy water or from the foul and milk] water produced in feeding thefish, especially if stale liver is used as food. The food itself maj also produce it. butI think ii generally comes from the fouling of the w ater. As an ounce of preventionis worth a pound of cure, the best plan is to prevent, if possible, the diseases bykeeping the water pure. Bj watching the movements of the fish one can generallydetect the symptoms of the diseases before they reach an alarming stage. If the ice page 253.) Plate 93. -. ARTIFICIAL PROPAGATION OF THE RAINBOW TROUT. 253 gills are affected, the fish will usually swim high in the water, and in an uneasy rest-less manner, as if gasping for breath. When this is observed the gills should beexamined to see it they are becoming inflamed and swollen. If tbe tish are taking askin disease, they will generally indicate it by nibbing themselves on the bottom ofthe trough or against anything that may be convenient. They will dive down andgive themselves a quick twisting motion against the bottom of the trough, as if theywere toying to scratch a place that was itching. If the progress of the disease is notpromptly checked it will soon be at a stage when nothing can be done, and the fishwill grow weaker every day until they begin to die in alarming numbers. The best remedy for both diseases that I know of is salt. Draw the water low onthe fish and apply it freely by sprinkling it evenly through the water. If it is a b
Size: 1199px × 2084px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashi, bookyear1896
