. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 30 FISH AND (UMK Experimental Procedure Construction of Gravel Beds Three standard hatchery troughs were each divided into seven nests 16" wide and 20" long by installing \" wire screens on the upstream side and \" wire screens 'in the downstream side. A space of 4" was left between nests. The finer mesh prevented loss of gravel or passage of fish to adjacent nests while the larger mesh permitted
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 30 FISH AND (UMK Experimental Procedure Construction of Gravel Beds Three standard hatchery troughs were each divided into seven nests 16" wide and 20" long by installing \" wire screens on the upstream side and \" wire screens 'in the downstream side. A space of 4" was left between nests. The finer mesh prevented loss of gravel or passage of fish to adjacent nests while the larger mesh permitted access of the emerging fry to the upstream space between nests where they could be caught and counted more readily. Baffles were placed between nests to force the water downward through the nests and prevent short circuiting above the gravel. Figure 11 shows a cross section of one trough to illustrate the arrangement more clearly, ({ravel which had been secured from the San Lorenzo River bottom and freed of silt by washing on an ordinary window screen was placed in the 21 nests to a depth of one to two inches. BAFFLES WATER SCREENS. FLOW \drain 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ! ! i i i i i ! i i i i i â 41. The eggs were fertilized in the usual manner and covered with water in a 10-gallon fish planting can where they were allowed to harden for one hour before transpor- tation to the hatchery. Distribution of Eggs The eggs were thoroughly mixed so that each experimental group would be uniform in character. Groups of 500 eggs were then counted and placed on the gravel in each of the 21 nests. The eggs were then covered by three to four inches of similar gravel and the trough drains arranged to maintain one to two inches of water above this level. In a. 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 Cal
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