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Facial Recognition in a Discus Fish (Cichlidae): Experimental Approach Using Digital Models
Shun Satoh1, Hirokazu Tanaka1, Masanori Kohda1
1Laboratory of animal Sociology, Department of Biology and Geosciences, Osaka City University, Sugimoto, Sumiyoshi, Osaka city, Osaka, Japan.
Plos One
|May 19, 2016
Summary
Discus fish recognize individuals using lateral facial color patterns, not frontal ones. This study highlights the importance of specific body areas for visual recognition in fish.
Area of Science:
- Ethology
- Animal Behavior
- Ichthyology
- Visual Ecology
Background:
- Many vertebrates, including mammals, birds, and fish, can visually distinguish familiar from unfamiliar individuals.
- Facial patterns are crucial for individual recognition in some species, with fish like cichlids and damselfish using specific facial color patterns.
- The functional significance of the facial area as a primary site for visual signaling in fish remains under investigation.
Purpose of the Study:
- To investigate whether discus fish (Symphysopdon aequifasciatus) rely solely on facial coloration for individual recognition of their pair-partner.
- To determine if the facial area is a critical site for visual cues in discus fish, or if patterns on other body parts are also utilized.
- To compare the role of facial coloration in fish individual recognition with that observed in birds and mammals.
Main Methods:
- Creation of modified digital models of discus fish.
- Presentation of four combinations of familiar and unfamiliar fish faces and bodies in both frontal and lateral views to focal fish.
- Observation and analysis of behavioral responses, including partner-specific and aggressive displays.
Main Results:
- Focal discus fish exhibited partner-specific displays towards models featuring familiar facial coloration.
- Aggressive displays were directed towards models with unfamiliar facial coloration.
- Individual recognition was found to depend on lateral facial color patterns, rather than frontal patterns, despite unique colorations on other body parts.
Conclusions:
- Discus fish utilize lateral facial coloration for individual recognition, indicating the importance of this specific visual cue.
- The findings suggest that while discus fish possess unique patterns across their bodies, the lateral face is prioritized for identifying conspecifics.
- This study contributes to understanding the evolution and mechanisms of visual individual recognition in fish, with implications for comparative studies across taxa.
