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Fish

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Effects of salinity on survival, growth and reproduction of non-native Nile tilapia (Oreochromis niloticus) from southern Mississippi

Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL

fl.biology.usgs.gov — The Nile tilapia (Oreochromis niloticus) is commonly used in aquaculture worldwide. Feral populations exist in many regions where individuals escape culture and establish in natural habitats. In Mississippi, Nile tilapia are established in at least three distinct localities (fig. 1): the lower Pascagoula and Escatawpa river drainages, and a More...

  • Image of Nile tilapia (Oreochromis niloticus)

Low-temperature tolerance of African jewelfish, (Hemichromis letourneuxi)

Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL

fl.biology.usgs.gov — Because the African jewelfish has a broad salinity tolerance, scientists tested how the species low-temperature tolerance varied at three salinities: freshwater (0 ppt), brackish (10 ppt) and marine (35 ppt) in the laboratory. A field experiment was then conducted to examine the survivorship of individuals when caged in several common aquatic More...

  • Image of an African jewelfish, (Hemichromis letourneuxi)

Using Parasites to Monitor Ecosystem Health

Publisher: USGS | Science Center: Western Fisheries Research Center (WFRC, Seattle) | Format: URL

www.werc.usgs.gov — Parasites can play a positive role in ecosystems. The USGS Western Ecological Research Center is working with the Channel Islands National Park in California to better understand how bacterial epidemics can protect kelp forests from overgrazing by sea urchins and how parasitic castrators might be used against invasive crabs. Researchers will More...

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Veined Rapa Whelk, Asian Rapa Whelk, Rapana venosa (Valenciennes, 1846) Mollusca: Gastropoda, Muricidae

Publisher: USGS | Science Center: Florida Integrated Science Center (FISC, Gainesville) | Format: URL

fl.biology.usgs.gov — This resource is a species profile and nonindigenous species information bulletin for the Veined Rapa Whelk, Asian Rapa Whelk, Rapana venosa (Valenciennes, 1846) Mollusca: Gastropoda, Muricidae. The shell is globose (rounded), with a very short-spire and large body whorl. The veined rapa whelks are carnivorous gastropods whose main diet More...

  • Veined Rapa Whelk, Rapana venosa (Actual size of specimen is ~6 in/152 mm)