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CLC number: S126

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Received: 2005-03-30

Revision Accepted: 2005-05-29

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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.8 P.812-816


Behavioral response of tilapia (Oreochromis niloticus) to acute ammonia stress monitored by computer vision

Author(s):  XU Jian-yu, MIAO Xiang-wen, LIU Ying, CUI Shao-rong

Affiliation(s):  Institute of Agricultural and Bio-Environmental Engineering, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   xujianyu@nbu.edu.cn, yinliu@ms.qdio.ac.cn

Key Words:  Ammonia stress, Tilapia, Computer vision, Aquaculture

XU Jian-yu, MIAO Xiang-wen, LIU Ying, CUI Shao-rong. Behavioral response of tilapia (Oreochromis niloticus) to acute ammonia stress monitored by computer vision[J]. Journal of Zhejiang University Science B, 2005, 6(8): 812-816.

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%A XU Jian-yu
%A MIAO Xiang-wen
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%A CUI Shao-rong
%J Journal of Zhejiang University SCIENCE B
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%P 812-816
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%D 2005
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2005.B0812

T1 - Behavioral response of tilapia (Oreochromis niloticus) to acute ammonia stress monitored by computer vision
A1 - XU Jian-yu
A1 - MIAO Xiang-wen
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A1 - CUI Shao-rong
J0 - Journal of Zhejiang University Science B
VL - 6
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SP - 812
EP - 816
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2005.B0812

The behavioral responses of a tilapia (Oreochromis niloticus) school to low (0.13 mg/L), moderate (0.79 mg/L) and high (2.65 mg/L) levels of unionized ammonia (UIA) concentration were monitored using a computer vision system. The swimming activity and geometrical parameters such as location of the gravity center and distribution of the fish school were calculated continuously. These behavioral parameters of tilapia school responded sensitively to moderate and high UIA concentration. Under high UIA concentration the fish activity showed a significant increase (P<0.05), exhibiting an avoidance reaction to high ammonia condition, and then decreased gradually. Under moderate and high UIA concentration the school’s vertical location had significantly large fluctuation (P<0.05) with the school moving up to the water surface then down to the bottom of the aquarium alternately and tending to crowd together. After several hours’ exposure to high UIA level, the school finally stayed at the aquarium bottom. These observations indicate that alterations in fish behavior under acute stress can provide important information useful in predicting the stress.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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