. Domesticated trout [microform] : how to breed and grow them. Fish culture; Trout; Pisciculture; Truite. 102 DOMESTICATED TROUT. m. Further Directions for Impregnating the Eggs. The following additional suggestions may be of ser- vice to the beginner in learning to impregnate trout eggs* 1. Use eggs that flow easily, and no others. It is true that there will be some spawners which, from an ex- ceptional construction of organs, will not give their spawn readily when ripe ; but in nineteen cases out of twenty, when the eggs come hard they are immature \ and the best rule to observe, at least in
. Domesticated trout [microform] : how to breed and grow them. Fish culture; Trout; Pisciculture; Truite. 102 DOMESTICATED TROUT. m. Further Directions for Impregnating the Eggs. The following additional suggestions may be of ser- vice to the beginner in learning to impregnate trout eggs* 1. Use eggs that flow easily, and no others. It is true that there will be some spawners which, from an ex- ceptional construction of organs, will not give their spawn readily when ripe ; but in nineteen cases out of twenty, when the eggs come hard they are immature \ and the best rule to observe, at least in beginning, is to take only the eggs which come easily. Avoid all others. If the first half come easily and the balance less so, take the first half and leave the rest. When you perceive the eggs lying in rows under the skin, do not try the fish at all. The ovaries are not open, and she is certainly not ripe. 2. Do not use too cold neater. The eggs begin to stick quicker, ard remained stuck longer, in very cold water than in warmer water. The zoosperms of the milt also are less active and effective in very cold water.* At all events, my experience has been that very cold water is unfavorable to impregnation. In October the water in the brooks will do very well, but later, in November and December, it gets too cold, and the necessary exposure to the cold air while * M. de Quatrefages says that the spermacozoa of trout milt live the longest at a temperature between 41° and 48° Fahrenheit; but that when the temperature exceeds these limits, the increase of the energy on the part of the animalcules compensates to a certain extent for the shorter duration of their vitality. eggs. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stone, Livingston, 1836-1912. Boston : J. R. Osgood
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