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A Shark’s Entire Body is An Ear

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    Scientists explained dynamic fundamental phenomena in living organisms specifically fishes. Fishes’ whole body act as an ear which is very interesting to know. Let us see how this phenomenon happens biologically.

    Dynamic phenomena of hearing in sharks and other fishes

    Lateral Line System in sharks:

    specialized organs for equilibrium and gravity detection, audition and magnetoreception have evolved from the lateral line system of fishes .

    Lateral line system and Electrical sensing

    The lateral line system for electrical sensing is the head and body areas of most fishes, some amphibians, and the platypus. It consists of sensory pores in the epidermis of the skin that connects to canals leading into electroreceptors called ampullary organs. These organs can sense electrical currents in the surrounding water. Most living organisms generate weak electrical fields. The ability to detect these fields helps a fish (Shark) to find mates, capture prey, or avoid predators. This is the especially valuable sense in deep turbulent or murky water, where vision is of little use. In fact, some fishes actually generate electrical fields and then use their electroreception to detect how surrounding objects distort the field. This allows these fishes to navigate in murky or turbulent waters.

    Lateral line system and mechanoreceptor:

    A mechanoreceptor is excited by mechanical pressure or distortions. The lateral line system of cyclostomes, sharks, some of the more advanced fishes, and aquatic amphibians includes several different kinds of hair cell mechanoreceptors called neuromasts. Neuromasts are in the pits along the body, but not in the head region. All the neuromasts are responsive to local water displacement or disturbance. When the water near the lateral line moves, it moves the water in the pits and distorts the hair cells, causing a generator potential in the associated sensory neurons. Thus, animals can detect the direction and force of water currents and the movement of other animals or prey in the water. For instance, this sense enables a trout and shark to orient with its head upstream.

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