- Sep 2016
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scienceintheclassroom.org scienceintheclassroom.org
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Two pithed fish (fish 1, 19 g; fish 2, 21 g) preparation.
Fig.2 tab C: experimental setup with two fish with a force transducer for each one
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(D) Effect of curare. Red trace indicates strong electric organ discharge matched in time to unnormalized fish tension (green). Arrows indicate time of injections (fig. S3). Bar in (D) = 500 ms.
Fig. 2 tab D: red: the eel's cascades of electric shocks green: fish tension = fish moves After the fish is treated with curare (molecule, poison for chemical messenger), it doesn't react to the eel's shocks anymore
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B) All eels induced whole-body tension, occurring 2 to 4 ms after strong discharge onset. No tension was developed from weak discharge. At low frequencies, individual twitches emerged for each discharge (top right) (fig. S2).
fig. 2 tab B: Eel EOD = eel electric organ discharge = every red peak represents an electric shock by the eel When the eel starts shocking in a cascade, the fish tension changes, which means that it moves. little top right figure: Also when the eel sends only out single shocks with longer Pauses, the fish moves very time.
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(A) An agar barrier separated eels from pithed fish. Eels shocked earthworms while fish tension was recorded.
Fig.2 tab A: experimental setup: the fish an the eel were separated by a electrically conductive jelly barrier. It can be measured by the force transducer if the fish moves, when the eel emits an electric shock.
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