. Fresh-water biology. Freshwater biology. 1036 FRESH-WATER BIOLOGY others, with both range and home in fresh water, belong to present marine families and have evidently comparatively recently become members of the fresh-water fauna. A notable example of a fish comparatively recently contributed by the sea to fresh water is Ilysterocarpus traski Gibbons. It is a viviparous fish of the rivers of central California. All of its rela- tives live in the Pacific Ocean from which it is an undoubted immigrant. The sea basses furnish several illustrative examples. The striped bass, Rocciis lineatus, is
. Fresh-water biology. Freshwater biology. 1036 FRESH-WATER BIOLOGY others, with both range and home in fresh water, belong to present marine families and have evidently comparatively recently become members of the fresh-water fauna. A notable example of a fish comparatively recently contributed by the sea to fresh water is Ilysterocarpus traski Gibbons. It is a viviparous fish of the rivers of central California. All of its rela- tives live in the Pacific Ocean from which it is an undoubted immigrant. The sea basses furnish several illustrative examples. The striped bass, Rocciis lineatus, is an oceanic fish entering rivers to spawn, while its nearest relative, Roccus chrysops, the white bass, is con- fined to the Great Lakes and upper Mississippi Valley. Closely related to these are the yellow bass, Morone interrupta, of the lower Mississippi Valley, and the white perch, Morone americana, in salt and fresh water from Nova Scotia to South CaroHna. The ninety other American members of this family are all marine. Various species of Robalos (Centropomus) enter fresh water. The Mugilidae have added various species to the fresh waters south of the United States. The Atherinidae have contributed the skipjack to our rivers and lakes, and south of us this marine family, whose eggs are provided with threads, has contributed and is con- tributing to the fresh waters all the way from Mexico to Fig. 1538. Skipjack, Labidcstcs skulus (Cope). Actual size, 95 mm. long. The sticklebacks and killifishes help to bridge the gap, if such exists, between the fresh waters and the ocean. Even the pipe- fishes and flounders have a tendency to colonize fresh waters, and the flounders at least have succeeded in South America. The Sciaenidae, a marine family, has contributed the thunder- pumper or white perch to the Great Lakes and Mississippi Valley, and several other species to the streams of South America. Some of its marine species occasionally run up streams. The large famil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
