. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . % FIG. 202.—Galls on the rose caused by the gall fly, Rhodites rosce. (After Kieffer.) Cuba, southern California, Hawaii, or Japan, the individualsbeing scattered at other times through the wide seas. Many fresh-wrater fishes, as trout and suckers, forsake thelarge streams in the spring, ascending the small brooks wheretheir young can be reared in greater safety. Still others,known as anadromous fishes, feed and mature in the sea, butascend the rive
. Evolution and animal life; an elementary discussion of facts, processes, laws and theories relating to the life and evolution of animals . % FIG. 202.—Galls on the rose caused by the gall fly, Rhodites rosce. (After Kieffer.) Cuba, southern California, Hawaii, or Japan, the individualsbeing scattered at other times through the wide seas. Many fresh-wrater fishes, as trout and suckers, forsake thelarge streams in the spring, ascending the small brooks wheretheir young can be reared in greater safety. Still others,known as anadromous fishes, feed and mature in the sea, butascend the rivers as the impulse of reproduction grows such fishes are the salmon, shad, alewife, sturgeon, andstriped bass in American waters. The most remarkable case23 342 EVOLUTION AND ANIMAL LIFE of the anadromous instinct is found in the king salmon orquinnat (Oncorhynckus tschawytscha) of the Pacific great fish spawns in November, at the age of four yearsand with an average weight of twenty-two pounds. In theColumbia River it begins running with the spring freshets inMarch and April. It spends the whole summer without feedin
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