. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Fig. 33. Mayfly nymph Iron. Note gill-plates on side of abdomen and de- body and legs for living in swift water. Six times natural size. Fig. 3 4. Damselfly nymph, Artjia. Note three gill-plates on end of abdomen. Three times natural size. necessary environmental conditions that they require as home sites existed therein. Further, every cold-water, unpolluted stream invari- ably contains many smaller kinds of stonefly nymphs
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Fig. 33. Mayfly nymph Iron. Note gill-plates on side of abdomen and de- body and legs for living in swift water. Six times natural size. Fig. 3 4. Damselfly nymph, Artjia. Note three gill-plates on end of abdomen. Three times natural size. necessary environmental conditions that they require as home sites existed therein. Further, every cold-water, unpolluted stream invari- ably contains many smaller kinds of stonefly nymphs that are equally as good food if not of as large size as Pteronarcys. Mayflies and stoneflies have similar life cycles. The eggs are laid in the water where they hatch into nym])lis. Wlien grown they emerge from the water as adults. They have no pupal stage. Mayfly nymphs can always be recognized by the presence of gills on the back of the abdomen (see Fig. 33). Xo other aquatic insect possesses gills in this position. Stonefly nymphs are easily distinguished by their two tails and tufts of filamentous gills at the bases of the legs. Many possess. 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 California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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