Use of acceleration loggers in aquaculture to determine net-cage use and field metabolic rates in red sea bream <Emphasis Type="Italic">Pagrus major</Emphasis> |
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| Authors: | Tohya Yasuda Kazuyoshi Komeyama Keitaro Kato Yasushi Mitsunaga |
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| Institution: | (1) Seikai National Fisheries Research Institute, Fisheries Research Agency, 1551-8 Taira-machi, Nagasaki 851-2213, Japan;(2) Graduate School of Agriculture, Kinki University, 3327-204 Nakamachi, Nara 631-8505, Japan;(3) Faculty of Fisheries, Kagoshima University, 4-50-20 Shimoarata, Kagoshima 890-0056, Japan;(4) Fisheries Laboratory of Kinki University, 3153 Shirahama, Wakayama 649-2211, Japan;(5) Faculty of Agriculture, Kinki University, 3327-204 Nakamachi, Nara 631-8505, Japan |
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| Abstract: | We investigated the usefulness of acceleration loggers in aquaculture by examining net-cage use and metabolic rates in red
sea bream, Pagrus major. First, the fish’s metabolic rate (mg O2 kg−1 min−1) was measured with the logger in a swim tunnel at designated water velocities. We found that metabolic rate could be expressed
by using a linear regression model of the activity rate index (unitless min−1) derived from acceleration data. Using this equation, the field metabolic rates of three fish in a net cage were monitored
and were estimated at 14.1–15.0 kcal kg−1 day−1. The results suggested that 15–19% of energy from satiation feeding ration was consumed for metabolism and activity in the
net cage. The loggers showed orderly net-cage use by the fish. Tagged individuals used the whole cage from surface to bottom,
but individual fish that preferred the surface area rarely used the bottom, and vice versa. Metabolic rate increased significantly
with distance of the fish from their preferred depths. The logger provided information on the physiological and behavioral
responses of fish in a given breeding system, and its use should contribute to the design of practical aquaculture systems. |
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