Related Experiment Videos
Short-range orientation in electric fish: an experimental study of passive electrolocation
K T Shieh1, W Wilson, M Winslow
1Section of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA.
The Journal of Experimental Biology
|November 1, 1996
Summary
Gymnotiform electric fish use passive electrolocation to find others by tracking electric fields. These fish rely on immediate electric cues, rather than cognitive maps, for navigation.
Area of Science:
- Neuroscience
- Animal Behavior
- Sensory Biology
Background:
- Gymnotiform electric fish navigate using electrolocation.
- Passive electrolocation involves detecting electric fields of conspecifics.
Purpose of the Study:
- Investigate how Gymnotiform electric fish use passive electrolocation.
- Determine if electric fish create cognitive maps of electric sources.
- Understand the role of instantaneous electric vectors in fish navigation.
Main Methods:
- Experiments with stationary electric dipoles presented to two species of Gymnotiform fish.
- Dipole stimuli were either silenced mid-approach or directionally "jumped" to a new orientation.
- Observed fish movements, approach behavior, and body bending responses.
Main Results:
- Gymnotus carapo failed to locate silenced dipole sources, indicating a lack of cognitive mapping.
- Brachyhypopomus diazi and Gymnotus carapo exhibited a rapid body-bending response to directional "jumps" in electric vectors.
- This bending response allowed fish to realign with the shifting electric field, with a latency of 0.5 seconds.
Conclusions:
- Passive electrolocation in Gymnotiform fish is stimulus-bound, relying on real-time sensory input.
- Fish navigate by tracking instantaneous local electric current vectors, not by forming spatial maps.
- The ability to track electric vector changes is crucial for maintaining orientation during electrolocation.