. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. Longitudinal section. Fig. 2.—Spawning race. Note.—Screen is used to prevent the clogging of the riffles, but with properly proportioned quantities of gravel and coarse sand the screen may be omitted. The eggs and milt of the fish should sink into the riffles with the liner particles of sand, to prevent fish from devoiu'ing the eggs during the spawning period. The race was in the open air, covered at intervals with strips of burlap laid over wire netting to afford shaded portions. The spawners showed no preference as to the shaded
. Bulletin of the Bureau of Fisheries. Fisheries; Fish culture. Longitudinal section. Fig. 2.—Spawning race. Note.—Screen is used to prevent the clogging of the riffles, but with properly proportioned quantities of gravel and coarse sand the screen may be omitted. The eggs and milt of the fish should sink into the riffles with the liner particles of sand, to prevent fish from devoiu'ing the eggs during the spawning period. The race was in the open air, covered at intervals with strips of burlap laid over wire netting to afford shaded portions. The spawners showed no preference as to the shaded or the open spaces, nesting in both. In some instances they. Fig. 3.—Suggested arrangement of a stream for the control of trout or salmon at the spawning season, and for the col- lection or rearing of the fry after the eggs have been naturally deposited and hatched. Sketch shows side channel, canal or prepared race, with flow of water regulated and controlled by dams, weirs, and gates. Under favoring condi- tions both channels might be available. spawned in water too shallow to cover their backs, and in the open sunlight. Wire netting was stretched over the race to protect it from disturbance by birds and domestic animals, but it had no further attention until the fish abandoned. 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 United States. Bureau of Fisheries. Washington, D. C. : Govt. Print. Off.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfisheries, bookyear19
