. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. TEOPICAL AQUAEIUM FISHES 13 in an aimless manner, keeping the water stirred up and the natural sedi- ment agitated. Furthermore, they soon learn to eat fish food and, after that step in education, they refuse to consume the less desirable particles found in an aquarium occupied by fish. Another scavenger is the fresh water mussel. The chief value of the mussel is to keep down the vegetable growth which causes aquarium water to turn green. Mussels are equipped with a sort of
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Aquariums; Goldfish. TEOPICAL AQUAEIUM FISHES 13 in an aimless manner, keeping the water stirred up and the natural sedi- ment agitated. Furthermore, they soon learn to eat fish food and, after that step in education, they refuse to consume the less desirable particles found in an aquarium occupied by fish. Another scavenger is the fresh water mussel. The chief value of the mussel is to keep down the vegetable growth which causes aquarium water to turn green. Mussels are equipped with a sort of siphon Fig. 5. Freshwater Mussel, Showing Water Intake and Outlet; .-\lso "Foot" With Which They Burrow and Travel by which they suck in water in one opening and eject it from another. In the few moments which they hold the water they extract from it the floating vegetable organisms. Two or three mussels should keep a ten- gallon aquarium free of green water. Care should be taken to occas- ionally see whether the mussels are living, as they decompose very rapidly and spoil the aquarium water. This can be done by tapping lightly on the shell and seeing whether they respond by closing. A curious but useful scavenger is an eel-like fish called the Weather- fish. Varieties are native to Europe and Asia. They are freely imported. 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 Innes, William T. (William Thornton), 1874-1969. Philadelphia, Innes
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Keywords: ., bookauthorinneswilliamtwilliamt, bookcentury1900, bookdecade1910
