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Dominance of Tilapia mossambica,an introduced fish species,in three Puerto Rican estuaries |
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| Authors: | Joanna Burger Keith Cooper Deborah J Gochfeld Jorge E Saliva Carl Safina David Lipsky Michael Gochfeld |
| Institution: | 1. Department of Biological Sciences, Rutgers University, 08855, Piscataway, New Jersey 2. Institute of Coastal and Marine Sciences, Rutgers University, 08903, New Brunswick, New Jersey 3. Graduate Program in Toxicology, Rutgers University, 08855, Piscataway, New Jersey 4. Department of Zoology, University of Hawaii at Manoa, 96822, Honolulu, Hawaii 5. United States Fish and Wildlife Service, Box 491, 00622, Boqueron, Puerto Rico 6. National Audubon Research Division, 306 South Bay Avenue, 11721, Islip, New York 7. Dynamac Corporation, 2 Executive Place, 07024, Fort Lee, New Jersey 8. Environmental and Community Medicine, UMDNJ-Robert Wood Johnson Medical School, 08854, Piscataway, New Jersey 9. Environmental and Occupational Health Sciences Institute, UMDNJ-Robert Wood Johnson Medical School, 08854, Piscataway, New Jersey |
| Abstract: | We compared species presence, abundance, and size characteristics of fish in three brackish, coastal marshes at Humacao, Roosevelt Roads, and Boqueron, Puerto Rico, in February and March 1988. The three marsh ecosystems were similar with respect to the presence of large expanses of open water bordered by emergent vegetation, creeks, and mangroves, and all had some recreational use. We sampled fish using gill nets. Tilapia (Oreochromis) mossambica were the most abundant fish, accounting for 55–79% of the samples at all three marshes. Overall, tilapia were both the largest (North Lagoon) and the smallest (Frontera Creek) at Humacao. Tilapia were most common in open lagoons rather than creeks or bays (except for Mandri Creek), and their distribution seemed unrelated to salinity. Tarpon (Megalops atlantica) were more abundant at low salinities, whereas other fish were more abundant at higher salinities. |
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