Fena Lake
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Fena Lake Photo: C. Lobban
Fena Reservoir was completed in 1951 to provide a dependable water supply for the U.S. Navy on Guam (BioSystems Analysis, 1990). By 1955, pond weed (Potamogeton crispus) and bladderwort (Utricularia sp.) had become established near the banks and especially in the shallow waters at the back end of the reservoir in depths of 15 ft. or less (Brock and Yamaguchi, 1955). In order to control these plants, 2 species of tilapia (Oreochromis mossambicus in 1956, Tilapia zillii most likely in 1957) were introduced into the reservoir (Brock and Takata, 1956; Nelson and Eldredge, 1991). Between 1962 and 1968 other species, including tucunare (Cichla ocellaris), small mouth bass (Micropterus dolomieu), large mouth bass (Micropterus salmoides), and channel catfish (Ictalurus punctatus) were introduced to control the stunting of the tilapia and/or to increase angling opportunities. Mosquito fish (Gambusia affinis; some time before 1955) and guppies (Poecilia reticulata; in 1956) were also introduced to the reservoir for the control of mosquitoes (Brock and Yamaguchi, 1955; Brock and Takata, 1956). Surveys to monitor the status of the introduced species ended in 1969, and since that time, no stock assessments have been conducted in Fena Reservoir. Additionally, other species, such as unwanted aquarium pets, have been deposited in the lake over the years. In order to determine the status of both native and introduced species, an extensive stock assessment project was begun in FY00.
After September 11, 2001, the US Navy eliminated all public access to Naval Magazine. Therefore this project is no longer active.
Guam Comprehensive Wildlife Conservation Strategy, 9/27/2005
