. Fresh-water biology. Freshwater biology. 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
. Fresh-water biology. Freshwater biology. 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. Fig. 1S46. Hog Sucker, CalosU)iiiits tiii^rlcaiis Le Sueur. Actual size, Si mm. long. total darkness, and those fishes, hke some sunfishes, that live in total fight, as far as tliis exists. The eye is not the only hght-perceiving organ of aquatic verte- brates. The skin is sensitive to light in many cases. The blind- fishes, whose eyes arc not functional and may be entirely removed, nevertheless appreciate the difference between light and dark. The young after having their eyes removed are as sensitive to. 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
