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ผู้เขียน หัวข้อ: Water quality and nutrient budget in closed shrimp (Penaeus monodon) culture sys  (อ่าน 2828 ครั้ง)
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« เมื่อ: เมษายน 05, 2010, 10:29:02 AM »

Water quality and nutrient budget in closed shrimp (Penaeus monodon) culture systems

Dhirendra Prasad Thakur a, b and C. Kwei Lina

a Agriculture and Aquatic Systems and Engineering Program, Asian Institute of Technology, PO Box 4, Klong Luang, Pathumthani 12120, Thailand
b Department of Aquaculture, Faculty of Agriculture, Kochi University, Nankoku, Kochi 783-8502, Japan
Received 19 March 2002;  accepted 9 October 2002. ; Available online 20 January 2003.

Abstract
An experiment was conducted for intensive culture of shrimp (Penaeus monodon) in concrete tanks for a period of 90 days without water exchange (closed system) to determine the effects of stocking density (25 and 50 juveniles per m2) and bottom substrate (soil and concrete) on water quality, shrimp growth performance, and nutrient distribution and budget. Total ammonia and nitrite–nitrogen concentrations in all the treatments remained low in the safe range for shrimp during the study period. Shrimp weight gain and production was higher in the treatment with higher stocking density. Shrimp survival and FCR were not significantly different among the treatments. Nutrient budget revealed that shrimp could assimilate only 23–31% nitrogen and 10–13% phosphorus of the total inputs. The major source of nutrient input was feed, shrimp feed accounted for 76–92% nitrogen and 70–91% phosphorus of the total inputs. The major sinks of nutrients were in the sediment, which accounted for 14–53% nitrogen and 39–67% phosphorus of the total inputs. The drained water at harvest contained 14–28% nitrogen and 12–29% phosphorus of the total inputs. The study has demonstrated that closed shrimp culture system can maintain acceptable water quality for shrimp growth and reduce nutrient loss through pond effluents.

Author Keywords: Shrimp culture; Closed system; Water quality; Growth; Nutrient budget

Aquacultural Engineering
Volume 27, Issue 3, March 2003, Pages 159-176
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