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Silver Dollar Fish for Biological Control of Submersed Aquatic Weeds

R. R. Yeo
Weeds
Vol. 15, No. 1 (Jan., 1967), pp. 27-31
DOI: 10.2307/4041061
Stable URL: http://www.jstor.org/stable/4041061
Page Count: 5
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Silver Dollar Fish for Biological Control of Submersed Aquatic Weeds
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Abstract

Two fish from South America. (Metynnis roosevelti Eigenmann and Mylossoma argenteum E. Ahl.), both called silver dollar fish, grazed rapidly on several species of submersed aquatic weeds. Horned pondweed (Zannichellia palustris L.), American pondweed (Potamogeton nodosus Poir.), and sago pondweed (Potamogeton pectinatus L.) were most palatable to the fish. Richardson pondweed (Potamogeton richardsonii (Ar. Benn.) Rydb.), curlyleaf pondweed (Potamogeton crispus L.), and American elodea (Elodea canadensis Michx.) also were grazed. The fish readily grazed on shoots of all sizes except those of mature plants. The Mylossoma grazed the plants more rapidly than the Metynnis. When water temperatures were above 70 F, the fish became more active in their feeding habits.

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