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"name": "Salinity tolerance of the African Jewelfish Hemichromis letourneuxi, a non-native cichlid in South Florida (USA)",
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"value": "10.1643/CP-09-069",
"url": "https://doi.org/10.1643/CP-09-069"
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"@type": "Periodical",
"name": "Copeia",
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"issueNumber": "3"
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"datePublished": "2010",
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"abstract": "The African Jewelfish (Cichlidae:\u00a0Hemichromis letourneuxi) is a predatory, non-native fish that has recently (since 2000) begun to expand its geographic range across south Florida. The salinity tolerance of\u00a0H. letourneuxi\u00a0was unknown, and thus it was unclear whether the species could use estuarine or coastal environments. The response of\u00a0H. letourneuxi\u00a0to chronic change in salinity was evaluated here by exposing fish to progressively increasing salinities (0\u201380\u00a0ppt). Fish were held at target salinities for a minimum of 30\u00a0days. The species showed excellent survival from 0\u201350\u00a0ppt. At 60\u00a0ppt, only 25% of the fish survived, and mean estimated survival time was 12\u00a0days. Above 60\u00a0ppt, mortality was 100%. Fish grew equally well from 0\u201350 ppt. In another experiment, fish were transferred directly from freshwater to various salinities from 5\u201335\u00a0ppt (seawater) and held for seven days, after which survivors were returned to freshwater. All fish transferred directly from freshwater to salinities up to 20\u00a0ppt survived; only 56% survived when transferred from freshwater to 25\u00a0ppt, and none survived transfer above 25 ppt. Experimental results indicated that\u00a0H. letourneuxi\u00a0can persist easily in salinities prevalent in coastal environments, even during periods of hypersalinity common in south Florida estuaries. Salinity will not restrict its dispersal by coastal pathways.",
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"name": "Langston, Jacqueline N.",
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"name": "Hill, Jeffrey E.",
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"url": "https://www.usgs.gov/centers/fort-collins-science-center"
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