Etroplus Maculatus Geophagus
A small cyprinodont which can withstand considerable variations in
temperature with season. Although not native to Mexico the natural range
of this fish extends very close to the border with the U.S. Thus the
only recorded introduction of this species represents an extension
southwards of its natural range.
The aptly named mosquito fish is one of the species with the widest
range of introductions. The species has been transported to every
continent to. control mosquitos and has thus acquired a near pan-global
distribution. Its extreme tolerance of low as well as high temperatures
and of low dissolved oxygen conditions has favoured its establishment
over. wide range of climatic conditions. The success of this species in
controlling mosquitos has been the subject of mud debate (see for
example Gerberich and Laird, 1968). The use of biological vector
controls waned with the introduction of pesticides, but recent
ecological concern as to the effect! of such bio-toxins has led to a
renewed interest in biological control.
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