. Les poissons. Les poissons. 8 La vie du poisson ou de pigments bleus, ou de colorants, sur ses écailles ou sur la tête ou les nageoires, ce pigment est absorbée lorsque la saison de reproduction est terminée. Ce n'est pas le cas des crapets, qui demeure à peu près le même à toutes les saisons. Le mâle et la femelle sont de couleur identiques et ne doivent pas être distingués sans dissection. Si nous examinons les balances, nous qu'ils sont marqués avec des lignes fines et concentrique strie ;, et une partie de la couleur apparente est due à l'effet de la lignes fines sur la lumière. Cela donne à l'éclat bleuté ou sheen dont nous pouvons voir dans certaines l

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. Fishes. Fishes. 8 The Life of the Fish or blue pigments, or coloring matter, on its scales or on its head or fins, this pigment being absorbed when the mating season is over. This is not true of the sunfish, who remains just about the same at all seasons. The male and female are colored alike and are not to be distinguished without dissection. If we examine the scales, we shall find that these are marked with fine lines and concentric stria;, and part of the apparent color is due to the effect of the fine lines on the light. This gives the bluish lustre or sheen which we can see in certain lights, although we shall find no real blue pigment imder it. The inner edge of each scale is usually scalloped or crinkled, and the outer margin of most of them has little prickly points which make the fish seem rough when we pass our hand along his sides. The Lateral Line.—Along the side of the fish is a line of peculiar scales which runs from the head to the tail. This is. Fig. 4.—Ozorthe dictyogranima (Herzenstein). A Japanese blenny, from Hakodate: showing increased number of lateral lines, a trait characteristic of many fishes of the north Pacific. called the lateral line. If we examine it carefully, we shall see that each scale has a tube from which exudes a watery or mucous fluid. Behind these tubes are nerves, and although not much is known of the function of the tubes, we can be sure that in some degree the lateral line is a sense-organ, perhaps aiding the fish to feel sound-waves or other disturbances in the water. The Fins of the Fish.—The fish moves itself and directs its course in the water by means of its fins. These are made up of stiff or flexible rods growing out from the body and joined to- gether by membrane. There are two kinds of these rays or rods in the fins. One sort is without joints or branches, tapering to a sharp point. The rays thus fashioned are called spines, and they are in the sunfish stiff and sharp-pointed. The others. Please note that t

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