The current research was conducted with the aim to investigate rate of chromium accumulation in various tissues commercially valuable freshwater fish, Grass Carp, Ctenopharyngodon idella. Investigation included skin, muscles, liver, swim bladder, intestine, and gills fish. For this purpose, fish were exposed sub lethal concentration hexavalent form potassium dichromate a dose 120 mg/L for 40, 2...

32 thousands of juveniles grass carp Ctenopharyngodon idella were reared in Fadak fish farm about 15 g. They transferred from culture station Marine Science Center and spread equally four ponds each 8.5 donum. The density was 940 /donum the period 15/ May to December 2007. Total weight for nearest milligram taken monthly. Fishes fed daily with green alfalfa as a main food item rate 8-15% body a...

The present study catalogues exotic and allochthonous fish species found in the three main freshwater river drainages of Rio Grande do Sul State using records scientific collections literature, discusses impacts caused by their introduction natural environments. Ten are area, i.e., Clarias gariepinus, Coptodon rendalli, Ctenopharyngodon idella, Cyprinus carpio, Hypophthalmichthys molitrix, nobi...

Three fish species (Cyprinus carpio, Ctenopharyngodon idella and Carrassius auratus auratus) were artificially infected with the fungus Saprolegnia parasitica. The infection was done under certain laboratory circumstances represented by a change in temperature (10, 15, 20, 25 30°C) nutrients (normal, decrease increase nutrients) constant pH. statistical analysis of results showed that influence...

First posted April 28, 2023 For additional information, contact: Associate Director, Ecosystems Mission AreaU.S. Geological Survey12201 Sunrise Valley DriveReston, VA 20192Biological Threats and Invasive Species Research ProgramContact Pubs Warehouse U.S. Survey (USGS) research has supported management of Hypophthalmichthys nobilis (bighead carp), Mylopharyngodon piceus (black Ctenopharyngodon ...