The Growth and N, P Uptake Rates of Ulva pertusa Cultured in Coastal Fish Farms

KITADAI Yuuki, KADOWAKI Shusaku

doi:10.11233/aquaculturesci1953.52.65

Biological water purification by culturing Ulva pertusa in coastal fish farms was estimated as a function of light intensity, dissolved inorganic nutrients and water temperature. Ulva pertusa was cultured from 0.5 m to 8 m depths in coastal fish farms from August to November, 2002. The maximum growth of thallus area, wet weight and thickness were recorded at 0.5 m depth. The maximum growth of thallus area reached to 640 cm² on August. The maximum growth of thallus thickness reached to 0.11 mm on November. Average contents of total nitrogen (N) and total phosphorus (P) in Ulva pertusa reached to 35 mg N/g dry and 2.1 mg P/g dry in October, respectively. The maximum N, P uptake rates of Ulva pertusa were 3.6 mg N/m²/day and 0.19 mg P/m²/day at 0.5m depth, respectively. Michaelis-Menten's constants of N, P uptake rates were 26μg N/l and 8.6μg P/l, respectively. Downward irradiance of 730μmol/m²/s resulted in the maximum N, P uptake rates. N, P uptake rates of Ulva pertusa at 25°C were 2.5 mg N/m²/day and 0.13 mg P/m²/day, respectively. Water temperature coefficients of N, P uptake rates were 1.076 and 1.084, respectively. The N and P uptake rates of cultured Ulva pertusa were formulated from dissolved inorganic nutrients, light intensity and water temperature characteristics found in coastal fish farms, and the calculated values corresponded well with the observed values.

The Growth and N, P Uptake Rates of Ulva pertusa Cultured in Coastal Fish Farms

Bibliographic Information

Search this article

Abstract

Journal

Citations (1)*help

References(19)*help

Keywords

Details 詳細情報について

Export

Report a problem