Stomach contents of young bluegill Lepomis macrochirus in the Urano River of Nagano prefecture [Japan]
2005
Katano, O.(National Research Inst. of Fisheries Science, Yokohama(Japan)) | Nakamura, T. | Yamamoto, S. | Abe, S.
Seventy-five young bluegill Lepomis macrochirus were captured by electro-fishing in the Aa-Bb river-type section of the Urano River in June and July, 2003. All bluegill were within 1 m of the river bank. Only 8 of the 75 bluegill did not have food present in the stomach. The index of stomach fullness was 0.63% +- 0.69 SD, reaching the maximum of 2.86%. Bluegill predominantly preyed on chironomid larvae (60%), followed by ephemeropteran nymphs, trichopteran larvae and terrestrial insects. The diet of bluegill overlapped considerably with that of some other native fishes in the Urano River. Bluegill is considered to have a negative effect on the fish community in rivers and streams and needs to be eradicated.
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