The artificial propagation of the rainbow trout . efer to have my lish fed twice a day, at regularhours morning and evening, giving half of the above-stated quantity at each will keep the lish in a thrifty and growing condition. As the lish increase in sizethe amount of food should be increased proportionately. I mount of water necessary for n spawning-pond.—There is no rule, so far as 1 know,that will apply to this matter at all times and in all places. It must necessarily begoverned by the temperature of water, size and shape of the pond, and the numberand size of the fish to be
The artificial propagation of the rainbow trout . efer to have my lish fed twice a day, at regularhours morning and evening, giving half of the above-stated quantity at each will keep the lish in a thrifty and growing condition. As the lish increase in sizethe amount of food should be increased proportionately. I mount of water necessary for n spawning-pond.—There is no rule, so far as 1 know,that will apply to this matter at all times and in all places. It must necessarily begoverned by the temperature of water, size and shape of the pond, and the numberand size of the fish to be supported, the amount of shade, etc. For a spawning pond,such as 1 have described, where the water is plentiful, 1 would give at. least 200gallons per minute. Not that 1 consider that amount necessary for the support of thelish. but the pond will be kept cleaner and the lish will enter the racew ay better atspawning time. Under no circumstances would 1 give, with water ranging from >0 to Bull U. S. F. C. 1896. 1T0 lace page 243.) Plate ARTIFICIAL PROPAGATION OP THE RAINBOW TROUT. 243 55 degrees and with all other conditions favorable, less than 75 gallons per consider that amount about the minimum for a pond built and stocked as I haverecommended. In order to maintain an even temperature in the ponds they shouldbe banked against the sides and ends with earth, which, of course, covers the frame-work that is shown in plate 89. The embankments should be broad enough on top toadmit of a good walkway around the ponds. Spawning season.—The spawning season varies with the locality and the tempera-ture of the water. It is usually two to four weeks later in the streams than where thefish are kept confined in spring water. In the ponds at the Wytheville Station weexpect to find spawuers any time after the 1st of November; the season is well startedby the 15th, and it generally closes about the 1st of March. December and Januaryare our best months. In California the
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