deep sea fish transparent head | deep sea fish bursting Mesopelagic fish Below the epipelagic zone, conditions transform rapidly. Between 200 metres and about 1000 metres, light continues to fade until there may be almost non-e. Temperatures fall through a thermocline to temps between 3. 9 °C (39 °F) and 7. 8 °C (46 °F). This is the twilight or mesopelagic zone. Pressure continues to enhance, at the rate of one ambiance every 10 metres, while nutrient concentrations fall, along with dissolved oxygen and the rate at which the water comes up. "|4| Sonar operators, using the newly developed desear technology during World War II, had been puzzled by what appeared to be an incorrect sea floor 300-500 metres deep at day, and less deep at night. This turned into due to millions of marine microorganisms, most particularly small mesopelagic fish, with swimbladders that reflected the sonar. These types of ...
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