deep sea fish surface | deep sea lantern fish Mesopelagic fish Below the epipelagic zone, conditions modify rapidly. Between 200 metres and about 1000 metres, light continues to fade until there exists almost non-e. Temperatures fall season through a thermocline to temperatures between 3. 9 °C (39 °F) and six. 8 °C (46 °F). This is the twilight or mesopelagic zone. Pressure continues to increase, at the rate of one atmosphere every 10 metres, when nutrient concentrations fall, along with dissolved oxygen and the rate at which the water flows. "|4| Sonar operators, using the newly developed pronunciarse technology during World War II, had been puzzled by what appeared to be a false sea floor 300-500 metres deep at day, and fewer deep at night. This developed into due to millions of marine creatures, most particularly small mesopelagic fish, with swimbladders that reflected the sonar. These kinds of organisms migrate up in to s
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