deep sea fish surface | deep sea fishing battle Mesopelagic fish Under the epipelagic zone, conditions transform rapidly. Between 200 metre distances and about 1000 metres, light continues to fade until there may be almost none. Temperatures land through a thermocline to temperature between 3. 9 °C (39 °F) and 7. 8 °C (46 °F). This is the twilight or mesopelagic zone. Pressure continues to boost, at the rate of one ambiance every 10 metres, although nutrient concentrations fall, along with dissolved oxygen as well as the rate at which the water circulates. "|4| Sonar agents, using the newly developed sonar technology during World War II, had been puzzled by what appeared to be an incorrect sea floor 300-500 metre distances deep at day, and less deep at night. This ended up being due to millions of marine organisms, most particularly small mesopelagic fish, with swimbladders that reflected the son...
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