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ผู้เขียน หัวข้อ: Modeling growth of Nile tilapia (Oreochromis niloticus) in a cage-cum-pond integ  (อ่าน 27 ครั้ง)
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« เมื่อ: ธันวาคม 04, 2019, 11:49:41 AM »

Modeling growth of Nile tilapia (Oreochromis niloticus) in a cage-cum-pond integrated culture
system
Yang Yi * Aquaculture and Aquatic Resources Management Program, School of En6ironment,
Resources and De6elopment, Asian Institute of Technology, P.O. Box 4, Klong Luang, Pathumthani 12120, Thailand
Received 10 July 1997; accepted 25 August 1999

Abstract

A bioenergetics model was developed to simulate growth of both caged and open-pond Nile tilapia in a cage-cum-pond integrated culture system. The model incorporated six key variables affecting Nile tilapia growth in the cage-cum-pond integrated culture system: body size, water temperature, photoperiod, dissolved oxygen, unionized ammonia and food availability. Caged tilapia were given artificial feed, while growth of open-pond tilapia was dependent
on uneaten artificial feed from the caged tilapia and natural foods derived from cage wastes. In the model, availability of natural foods was estimated by a relative feeding level parameter, which was a function of potential net primary productivity based on fish standing crop and the limiting nutrients in the ponds. The model was validated using growth data for both caged and open-pond tilapia in 28 ponds. The model described 96 and 85% of the variance in growth of caged and open-pond tilapia, respectively. Statistical analyses indicated significant agreements between predicted and observed values for both cage and open-pond systems. The model showed that the growth of open-pond tilapia was limited by phosphorus limiting primary production when the total number of tilapia stocked in cages was not greater than 200 fish pond1, beyond which the limiting nutrient was phosphorus
at the beginning of experiments and then shifted to nitrogen. The percentages of the culture period during which nitrogen limitation occurred increased from 0 to 84.4% with the increase of artificial feed inputs. The model revealed nitrogen from biological nitrogen fixation

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* Tel.: 66-2-5245454; fax: 66-2-5246200.
E-mail address: yangyi@ait.ac.th (Y. Yi)
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