Gambusia affinis

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Also known as Mosquitofish. Diet: zooplankton, small insects and detritus
Max. Size: 5.1 cm
Fun Fact: Found frequently in brackish water. This fish is more tolerant of pollution than are most other fishes (Lewis 1970, Kushlan 1974). It tolerates dissolved oxygen levels as low as 0.18 mg/L (Ahuja 1964) but cannot tolerate extreme cold; temperature apparently limits the range northward (Hubbs 1971). However, some populations are known to overwinter under ice in Indiana and Illinois (Krumholz 1944).
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