How do the four short barbels on the lower jaw function compared to the upper pair?
Answer
The shorter ones might offer fine-tuned, immediate contact sensing near the mouth
The eight barbels likely function differently based on their position and length, creating a multi-tiered sensory array. The two very long maxillary barbels on the upper jaw are suggested to act as longer-range chemical antennae, sweeping the water column above the fish to detect passing prey or disturbances from a distance. Conversely, the four shorter barbels situated on the lower jaw are thought to provide fine-tuned, immediate contact sensing. They are ideally positioned to inspect potential food items directly upon contact or when the fish is foraging immediately near the river or lake bed.
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