Archive image from page 809 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 depthsofoceangen00murr Year: 1912 756 DEPTHS OF THE OCEAN Fish measure- ments. a certain law-bound space of time, which varies in different species. These facts form the basis of an important branch of marine research, which possibly more than any other will help us to understand the life conditions of animals. The foundation of this branch of science is m
Archive image from page 809 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 depthsofoceangen00murr Year: 1912 756 DEPTHS OF THE OCEAN Fish measure- ments. a certain law-bound space of time, which varies in different species. These facts form the basis of an important branch of marine research, which possibly more than any other will help us to understand the life conditions of animals. The foundation of this branch of science is mainly due to C. G. J. Petersen and H. Heincke. In his first investigations Petersen aimed at defining the age of the fish-species occurring in a restricted area, and for this purpose he selected a small Danish fjord, the Holbaek fjord, where he attempted to capture all sizes of the various fishes, and measured the length of each one; he then tabulated these length- measurements for each species in order to study the frequency of the various sizes. Fig. 553 shows the results of his measurements of the common vivipar- ous blenny (Zoarces vivipariis). The scale is in Danish inches, and each dot denotes a specimen measured ; males and females were measured separately, T. Petersen. i_ i_ i j where the sexes could be distinguished. I quote Petersen's description of this graphic representation : ' If we now consider the females, we undeni- ably find remarkably few of a length between 8 and lo inches ; also there is a marked gap between the largest of the fry and the smallest females. Something similar is seen though less plainly in the males. The latter are, however, too few to let the gaps appear quite plainly. Alternating with these gaps certain sizes occur as it were in heaps, where many fish have almost the same length. The blennies may, to put it shortly, C. G 1892. C. G. J. Petersen, Beretiiing fra deit danskc hiologiske Station, No. i, 1890, Kjobenhavn,
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