. The animans and man; an elementary textbook of zoology and human physiology. es the different kinds of salmon, the black-spotted or truetrout, the charr or red-spotted trout of various species,the whitefish, the grayling, and the famous ayu of Japanbelong to this family. In the sea are multitudes of fish forms. The myriadspecies of eels agree in having a long, flexible, snake-likebody, without ventral fins. Most of them live in the sea,but the single genus of true eels which ascends therivers is exceedingly abundant and widely eels are extremely voracious, but some of them h
. The animans and man; an elementary textbook of zoology and human physiology. es the different kinds of salmon, the black-spotted or truetrout, the charr or red-spotted trout of various species,the whitefish, the grayling, and the famous ayu of Japanbelong to this family. In the sea are multitudes of fish forms. The myriadspecies of eels agree in having a long, flexible, snake-likebody, without ventral fins. Most of them live in the sea,but the single genus of true eels which ascends therivers is exceedingly abundant and widely eels are extremely voracious, but some of them havemouths that would barely admit a pin-head. Cod-fishes arecreatures of little beauty but of great usefulness, swarming THE VERTEBRATES 197 in arctic and subarctic seas. The herring, soft and weakin body, are more numerous in individuals than any otherfishes. The flounders, of many kinds, lie flat on the seabottom. They have the head so twisted that the two eyesoccur both together on the uppermost side (fig. 97). Themembers of the great mackerel tribe swim in the open sea,. FIG. 97. The winter flounder, Pseudopleuronectes americanus. (AfterGoode.) often in great schools. Largest and swiftest of these isthe swordfish, in which the whole upper jaw is grown to-gether to form a long bony sword, a weap@n of offense thatcan pierce the wooden bottom of a boat. Many of the ocean fishes are of strange form and ap-pearance. The sea-horses (fig. 98) are odd fishes, cov-ered with a bony shell, and with the head shaped like thatof a horse. They are little fishes, rarely a foot long, andcling by their curved tails to floating seaweed. The por-cupine fishes and swell fishes have the power of filling thestomach with air, which they gulp from the surface. Theycan escape from their pursuers by floating as a round spinyball on the surface. The flying fishes leap out of the water,and sail for long distances through the air like cannot flap their long pectoral fins, and do not tr
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