Fishing Nets a Major Threat to Sea Turtles
During their migration, the loggerhead turtles often encounter fishing nets. Shrimp fishing amongst other fishing practices constitute a major threat to the sea turtles all over the world. The turtles get caught in the nets and drown, because they are unable to surface to breath. Hundreds, maybe thousands of these creatures are entangled in nets in US waters alone. Loggerheads are particular threatened by the nets, more so than any other species.
Modified trawl nets have a device that guides turtles and other larger animals out of the trawl net.

 ( picture on the right shows the guide rails in the net.)


http://www.conserveturtles.org/velador.php?page=velart80

By going to the new nets like the one above, the sea turtles can escape before drowning

A short, short story about the sea turtles

http://storify.com/haucarol/sea-turtles
The above link shows briefly human impact and what is being done about it  as viewed by divers, nature enthusiasts and and others.

The Loggerhead Sea Turtle, Introduction.
The Loggerhead sea turtle Caretta caretta are distributed all over the world. Fully grown they can weigh up to 300lbs and about 35 inches long. They are yellow to brown and have a patterned body. They can live for 47-67 years and become sexually mature within 30-33 years. The survival rate of sea turtles can range from 1 in 300 in protected and managed areas to 1 in 1000 in the wild with human interference. The turtles are currently listed as an endangered species and are protected by the International Union for the Conservation of Nature.