Annual monitoring of growth of red sea bream by multi-stereo-image measurement
2019
Tanaka, T. (Hokkaido University, Hakodate, Hokkaido (Japan). Graduate School of Fisheries Sciences) | Ikeda, R. | Yuta, Y. | Tsurukawa, K. | Nakamura, S. | Yamaguchi, T. | Komeyama, K.
In aquaculture, periodic measurement of fish body size is required to suitably assess growth progress. The aim of this study is to monitor the growth of free-swimming red sea bream, Pagrus major, farmed in net cages using multi-stereo-image measurement to determine the efficacy and potential applications of the method. After estimating appropriate sample sizes based on mean fork length and varying acceptable error ranges, we tracked fish growth using both multi-stereo-image measurement and traditional scoop-net capture methods for 1 year. Measurements were conducted four times every 3 months. In fish with fork length exceeding 40 cm, the appropriate sample sizes with acceptable error ranges of 1%, 2%, 3%, 4%, and 5% were around 100, 26, 12, 7, and 5 individuals, respectively, based on a 95% confidence interval. The fish exhibited most of their growth from June to December, with slower growth from February to June. This study provides evidence that multi-stereo-image measurement is an accurate and useful tool to enhance understanding of growth processes in cultured fish.
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