in the abyss, water tends to be just above freezing (35°F)
Although the water is cold, hydrothermal vents push heated water (750°F) up from beneath the ocean floor.
The Abyssal Food Chain
Location
Since there is no sunlight in the abyssal zone, plants are not the main producers. Instead, chemo-synthetic bacteria that receive energy from Hydrogen and Carbon Dioxide , and is the only producer to provide energy for primary consumers.