Archive image from page 820 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 GENERAL BIOLOGY 765 The study of numerous samples taken from the fish-stock Age-com- of a certain area may aim at ascertaining the age-com- theslstock°of position of that stock, and from the results the follow- fishes. ing main points in the natural history of the fish may be elucidated: (1) the age at which maturity occurs
Archive image from page 820 of The depths of the ocean;. The depths of the ocean; a general account of the modern science of oceanography based largely on the scientific researches of the Norwegian steamer Michael Sars in the North Atlantic depthsofoceange00murr Year: 1912 GENERAL BIOLOGY 765 The study of numerous samples taken from the fish-stock Age-com- of a certain area may aim at ascertaining the age-com- theslstock°of position of that stock, and from the results the follow- fishes. ing main points in the natural history of the fish may be elucidated: (1) the age at which maturity occurs; (2) the A • B Fig. 560. Two scales of five-year-old herrings. A, growth under normal conditions ; B, abnormal growth in the third zone. duration of life ; and (3) the variations in the age-composition and magnitude of the fish-stock. Studies of this kind have shown us that various species
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