Dynamics of algae growth and nutrients in experimental enclosures culturing bighead carp and common carp:Phosphorus dynamics |
| |
| Institution: | 1. U.S. Geological Survey, 6000 J Street, Placer Hal, Sacramento, CA 95819, United States;2. Faculty of Civil and Environmental Engineering, Gdańsk University of Technology GUT, Poland;3. Water Transfer Sub-Division from Luanhe River of Water Environment Monitoring Center, Haihe River Water Conservancy Commission, Tianjin 300170, China;4. Haihe Water Resources Protection Bureau, Haihe River Water Conservancy Commission, Tianjin 300170, China |
| |
| Abstract: | This is the third paper of the series about “Dynamics of algae growth and nutrients in experimental enclosures culturing bighead carp and common carp”. In this paper, phosphorus dynamics were inves-tigated under the condition of culturing bighead carp and common carp with added fish food (nitrogen dynamics is discussed in the second paper because their behaviors are so different from each other). Nearly fifty days’ observation results indicated that the reservoir water was typical of “phosphorus limited” water, and soluble reactive phosphorus (SRP) was the main constituent of measured total phosphorus (TP). The presence of fish food resulted in significantly higher SRP, dissolved total phos-phorus (DTP) and TP concentrations in contrast with the reservoir water. Moreover, continuous supply of fish food led to the decline of total nitrogen to total phosphorus (TN:TP) from more than 100 to less than 5. Variations in the ratio of TN to TP favored the growth of blue-green algae. Fish species affected phosphorus concentrations, and culturing bait-eating common carp contributed more to reducing the SRP, DTP and TP concentrations than culturing planktivorous bighead carp. 0.5%, 4.1%and 3.1%TP can be removed in enclosures with culturing bighead carp, common carp and mixed bighead carp and common carp, respectively. Abundant phosphorus in the fish culturing activities may be present as the uneaten food, algae cells, and within the water column and sediment, which should be taken into serious con-sideration for the target of future water eutrophication prevention and safety of the drinking water supply. |
| |
| Keywords: | Fish food Bighead carp Common carp Phosphorus flux Enclosure experiment |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
