Some of the natural predators of adult sea turtles include killer whales, sharks, jaguars and feral dogs.
Fishing hooks, long lines, gill nets and other types of fishing gear can create serious injuries and even kill sea turtles.
Sea turtles are large, air-breathing reptiles that inhabit tropical and subtropical seas throughout the world. General InfoSea turtles have long fascinated people and have figured prominently in the mythology and folklore of many cultures. Sea Turtle SpeciesScientists recognize seven living species of sea turtles, which are grouped into six genera.
HabitatsSea turtles depend upon many types of habitats for nesting, feeding and migratation.
Fishing dredges, extremely heavy metal frames dragged along the ocean floor, can crush and entrap turtles, causing death and serious injury. Environmental contamination from coastal runoff, marina and dock construction, dredging, aquaculture, oil and gas exploration and extraction, increased under water noise and boat traffic can degrade marine habitats used by sea turtles.
Disease, specifically fibropapillomatosis (FP), is a major threat to green turtles in some areas of the world.
How some marine turtle species function within the marine ecosystem is still poorly understood.

Loss or degradation of nesting habitat resulting from erosion control through beach nourishment and armoring, beachfront development, artificial lighting, and non-native vegetation is a serious threat affecting nesting females and hatchlings. Artificial lighting on or near the beach adversely affects both nesting and hatchling sea turtles. Some major threats to sea turtles are illegal harvesting, habitat encroachment, and pollution.
In many costal communities, especially in Central America and Asia, sea turtles are considered a food source. Sea turtles around the world have been studied to help collect information about their growth rates, reproductive cycles and migration routes. Turtles entangled in these types of fishing gear may drown and often suffer serious injuries to their flippers from constriction by the lines or ropes. Global warming could potentially have an extensive impact on all aspects of a turtle's life cycle, as well as impact the abundance and distribution of prey items.
Although beach nourishment, or placing sand on beaches, may provide more sand, the quality of that sand, and hence the nesting beach, may be less suitable than pre-existing natural beaches.
Specifically, artificial lighting may deter adult female turtles from emerging from the ocean to nest and can disorient or misorient emerging hatchlings away from the ocean. Harvest for Consumption : Sea turtles have spiritual or mythological importance in many cultures around the world, this has not prevented humans from consuming their eggs or meat.

In addition to entangling turtles, longline gear can also hook turtles in the jaw, esophagus, or flippers. These fisheries, called artisanal fisheries, can collectively have a very great impact on local turtle populations, especially leatherbacks and loggerheads.
For example, unmarked nests can be crushed or uncovered by heavy equipment, nesting turtles and hatchlings can get caught in construction debris or excavations, and hatchlings can get trapped in holes or crevices of exposed riprap and geotextile tubes. Hatchlings have a tendency to orient toward the brightest direction, which on natural, undeveloped beaches is commonly toward the broad open horizon of the sea.
Trawls that are not outfitted with turtle excluder devices (TEDs) do not allow turtles to escape, which may result in mortality through drowning. Turtles swimming or feeding at or just beneath the surface of the water are particularly vulnerable to boat and vessel strikes, which can result in serious propeller injuries and death. In addition, scientists have documented FP in populations of loggerhead, olive ridley, and flatback turtles.

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