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In page Mesopelagic zone:

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Food is often limited and patchy in the mesopelagic, leading to dietary adaptions. Common adaptations fish may have include sensitive eyes and huge jaws for enhanced and opportunistic feeding.[5] Fish are also generally small to reduce the energy requirement for growth and muscle formation.[9] Other feeding adaptations include jaws that can unhinge, elastic throats, and massive, long teeth.[9] Some predators develop bioluminescent lures, like the tasselled anglerfish, which can attract prey, while others respond to pressure or chemical cues instead of relying on vision.[9]