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A digital stereo-video camera system for three-dimensional monitoring of free-swimming Pacific bluefin tuna, Thunnus orientalis, cultured in a net cage

Published online by Cambridge University Press:  05 August 2011

Shinsuke Torisawa ,
Minoru Kadota ,
Kazuyoshi Komeyama ,
Katsuya Suzuki  and
Tsutomu Takagi
Shinsuke Torisawa*
Affiliation:
Faculty of Agriculture, Kinki University, 3327-204 Naka-machi, 631-8505 Nara, Japan
Minoru Kadota
Affiliation:
Faculty of Agriculture, Kinki University, 3327-204 Naka-machi, 631-8505 Nara, Japan
Kazuyoshi Komeyama
Affiliation:
Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, 890-0056 Kagoshima, Japan
Katsuya Suzuki
Affiliation:
National Research Institute of Fisheries Engineering, Fisheries Research Agency, 7620-7 Hasaki, 314-0408 Ibaraki, Japan
Tsutomu Takagi
Affiliation:
Faculty of Agriculture, Kinki University, 3327-204 Naka-machi, 631-8505 Nara, Japan
*
a Corresponding author: ns_torisawa@nara.kindai.ac.jp
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Abstract

We used a digital stereo-video camera system for three-dimensional monitoring of cultured Pacific bluefin tuna, Thunnus orientalis, swimming freely in a net cage. We estimated the fork length and length frequency distribution of individual fish using the direct linear transformation (DLT) method. Information obtained from stereo images is useful for managing the growth of tuna during rearing. Our aim was to develop a simple method involving a combination of DLT and commercial image-processing software to enable aquaculturists to obtain three-dimensional measurements of fish. In this study, we used a stereo-video camera system to evaluate the precision and validity of fish size estimates determined from repeated measurements. Of the total assessed individuals swimming within a distance of  <5.5 m from the camera system, estimates for 99% (106/107) were found to be valid, with an error ratio (standard error/mean) of  <5%. Therefore, we believe that our proposed simple method for monitoring free-swimming fish could be very useful for aquaculture management.

Keywords

Three-dimensional monitoringPacific bluefin tunaStereo-cameraAquacultureDirect linear transformation (DLT) method
Type
Note
Information
Aquatic Living Resources , Volume 24 , Issue 2 , April 2011 , pp. 107 - 112
Copyright
© EDP Sciences, IFREMER, IRD 2011

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