. Fresh-water biology. Freshwater biology. IOS4 FRESH-WATER BIOLOGY which quiet pools alternate with swift-flowing ripples. In the Mississippi Valley the riflles are occupied by darters, in Cuba by gobies, in South America by characins, and, although belonging to widely different famihes, they greatly resemble each other. Light and Adjustments to It. — In the shallower parts of clear water the fluctuations in light from day to night are but little less than in the air. Various fishes are variously adjusted to the. Fig. 1545. Hog Sucker, Calosloinus nigrlcJn^ Lc Sueur. size, J05 mm. lon
. Fresh-water biology. Freshwater biology. IOS4 FRESH-WATER BIOLOGY which quiet pools alternate with swift-flowing ripples. In the Mississippi Valley the riflles are occupied by darters, in Cuba by gobies, in South America by characins, and, although belonging to widely different famihes, they greatly resemble each other. Light and Adjustments to It. — In the shallower parts of clear water the fluctuations in light from day to night are but little less than in the air. Various fishes are variously adjusted to the. Fig. 1545. Hog Sucker, Calosloinus nigrlcJn^ Lc Sueur. size, J05 mm. long. light. Some are nocturnal, remaining hidden during the day, as the common catfish. Some combine stereotropism with their neg- ative heHotropism, and take shelter in crevices and under rocks. The hght-shunning habit on the part of their ancestors doubtless accounts for the cave-inhabiting blindfishes of to-day. Some diurnal fishes habitually stay in the shade of some tree, or log, or pier, while others are found in the open. There seems to be a complete gradation between the blindfishes, which always live in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
