The Mesopelagic Zone

The mesopelagic zone is from 200 m to 1000 m in depth, and fish in this area have adapted by being small, but with large mouths, and highly varied diets (Ocean, 2004). They have developed adaptions to reduce their metabolic rate; have lost their swim bladder; developed soft, weak bones; have lost scales and spines; and have developed flabby, watery flesh. Many have developed photophores (light organs) that produce bioluminescence. Examples of mesopelagic organisms in

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