Environmental Characteristics of Brown and Green Waters in Culture pond of Kuruma Prawn, Penaeus japonicus Bate.

DOI JASI 1 Citations 18 References

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  • クルマエビ養殖池のブラウンおよびグリーン海水の水質特性

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Abstract

It is well known that there is a close relationship between pond water color during the culture period and final yield in prawn culture. Water coloration in the pond is divided broadly into brown color (brown wter) and green color (green water) . The purpose of this paper is to present the environmental characteristics of brown and green waters. The results obtained were as follows:<BR>1) There was a difference in optical properties (transparency and extinction coefficient) between the brown and green waters.<BR>2) Neglecting the effect of zooplankton respiration, bacterial respiration and phytoplankton respiration account for the total oxygen consumption in the pond water. An experiment was designed to distinguish bacterial respiration from phytoplankton respiration. Phytoplankton respiratory rate was responsible for 92% and 46% of the total respiration in the brown and green waters, respectively.<BR>3) Regarding the relationship between dissolved inorganic nitrogen (DIN) and inorganic phosphate (IP) concentrations in pond water, brown and green water were clearly classified into two groups of DIN/IP ratio respectively over and under 3.5. It is suggested that phytoplankton composition and consequently water coloration in the pond depend on the DIN/IP ratio of sea water.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (1), 119-124, 1995

    Japanese Society for Aquaculture Science

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