how to fish in the abyssal depths survive the pressure

The temperature never fluctuates far from a chilling 39☏ (4☌).

The temperature in the bathypelagic zone, unlike that of the mesopelagic zone, is constant. The only light at this depth and lower comes from the bioluminescence of the animals themselves. Due to its constant darkness, this zone is also called the midnight zone. The depths from 1,000-4,000 meters (3,300 - 13,100 feet) comprise the bathypelagic zone. The eyes on the fishes are also larger and generally upward directed, most likely to see silhouettes of other animals (for food) against the dim light. It is strongest in the tropics and decrease to non-existent in the polar winter season.īecause of the lack of light, bioluminescence begins to appear on organisms in this zone .

The depth and strength of the thermocline varies from season to season and year to year. Temperature changes are the greatest in this zone because it contains the thermocline, a region where water temperature decreases rapidly with increasing depth, forming a transition layer between the mixed layer at the surface and deeper water. The mesopelagic zone is sometimes referred to as the twilight zone or the midwater zone, as sunlight this deep is very faint. The base of this mixing layer is the beginning of the transition layer called the thermocline.īelow the epipelagic zone is the mesopelagic zone, extending from 200 meters (660 feet) to 1,000 meters (3,300 feet). Wind keeps this layer mixed and thus allows the sun's heat to be distributed vertically. With that sunlight comes heat from sun, which is responsible for wide variations in temperature across this zone, both with the seasons and latitudes - sea surface temperatures range from as high as 97☏ (36☌) in the Persian Gulf to 28☏ (-2☌) near the North Pole. It is in this zone that most of the visible light exists.

This surface layer is also called the sunlight zone and extends from the surface to 200 meters (660 feet).

Preparedness and Mitigation: Individuals (You!).

Preparedness and Mitigation: Communities.

The Positive and Negative Side of Lightning.

How to fish in the abyssal depths survive the pressure