. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. degrees Fahrenheit. To those interested in identifying species of native snails we wouldrecommend a very excellent work published by the State Department ofPublic Education at Albany, N. Y,, entitled A Monograph on the Snailsof New York State, by H. A. Pilsbry. The book is profusely illustratedin color and to all practical purposes covers the species east of theRockies. The frog tadpole has been used by many as an aquarium scavenger,but its value is of considerable doubt. They dash about the aq
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. degrees Fahrenheit. To those interested in identifying species of native snails we wouldrecommend a very excellent work published by the State Department ofPublic Education at Albany, N. Y,, entitled A Monograph on the Snailsof New York State, by H. A. Pilsbry. The book is profusely illustratedin color and to all practical purposes covers the species east of theRockies. The frog tadpole has been used by many as an aquarium scavenger,but its value is of considerable doubt. They dash about the aquarium TROPICAL AQUARIUM 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, afterthat step in education, they refuse to consume the less desirable particlesfound in an aquarium occupied by fish. Another scavenger is the fresh water mussel. The chief value of themussel is to keep down the vegetable growth which causes aquarium waterto turn green. Mussels are equipped with a sort of siphon arrangement,. Fig. 5. Freshwater Mussel, Showing Water Intake and Outlet ; Also FootWith Which They Burrow and Travel by which they suck in water in one opening and eject it from the few moments which they hold the water they extract from it thefloating 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 rapidlyand spoil the aquarium water. This can be done by tapping lightly on theshell and seeing whether they respond by closing. A curious but useful scavenger is an eel-like fish called the Weather-fish. \arieties are native to Europe and Asia. They are freely imported
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidgoldfishvarietie00inne
