Deep-sea fish are fish that live in darkness under the surface water of sunlight that is below the cytoplasmic or phonic region of the ocean. The lantern is by far the most common deep sea fish. Other deep-sea fish include flashlight fish, cookie-cutter sharks, blabbermouths, angelfish, Parrish, and some species of roller.
About 2% of known marine species live in pathogenic environments. This means that they live in the water column, as opposed to living under the sea or flexible organisms. However, the characteristics of deep-sea organisms, such as bioluminescence, are also found in the Mesoplastic (200–1000 m deep) regions. The mesoplasmic zone is the dysphonic zone, meaning light minimal but still measurable. The minimum level of oxygen exists somewhere between 700 meters and 1000 meters depth, depending on the location of the ocean. This is also the region where nutrition is most abundant. The bathplegic and abisoplastic regions are aphotic, meaning no light enters this region of the ocean. These regions make up about 75% of the inhabited sea
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