Food habits of the longtail tuna, Thunnus tonggol from the south western region of the Sea of Japan
2005
Kobayashi, T.(Yamaguchi-ken. Fisheries Research Center, Nagato (Japan))
Number of specimens of long tail tuna were 242. Range of fork length and body weight of the specimens was 410 - 600mm and 1,327-3,886g respectively. On 242 fishes examined, 147 (61%) had organisms in their stomachs, including a variety of fishes and squids. The main diet was fish. Especially, jack mackerel, Trachurus japonicus (46-112mmSL), Japanese anchovy, Engraulis japonica (40-60mmSL), round herring, Etrumeus teres (60-82mmSL) and bottom perch, Apogon semilineatus were found often in their stomachs. The ratio of stomach content weight to body weight ranged from 0.01 to 5.75%.
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