Studies on the conditioning of bluegill sunfish - II. The response level of bluegill sunfish Lepomis macrochirus, to a demand feeder.

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  • 自動給餌器へのブルーギルの反応レベル
  • 自動給餌器へのブルーギルの反応レベル〔英文〕
  • ジドウ キュウジキ エ ノ ブルーギル ノ ハンノウ レベル エイブン

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Abstract

Six bluegill sunfish were trained in a free operant situation during 90- to 200-day periods including 55 to 86 30-min training sessions to obtain food by thrusting up a bobber (bobber upthrust response: BUR) and thus activating an automatic feeder. Individual variation in the level of the BUR was great, varying between 22.9 and 52.0 responses/session on an average. Enhancement of the level of the BUR with increased numbers of trainings over the experimental period was proved statistically for only 2 fish out of the 6. Within a session, decreasing trends in the level of the BUR were observed for all specimens. The sequential mean levels of the BUR obtained from consecutive 2.5-min blocks of each session fit a negative exponential function (y=aebx; y is the mean levels of BUR for xth block, a and b are constant, b<0) well. In contrast to the great variation in the level of the BUR between specimens, the rates of attenuation, expressed by (1-eb), conform rather well, ranging between 0.06 and 0.13.

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 50 (9), 1475-1480, 1984

    The Japanese Society of Fisheries Science

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