Distinguish between farmed and wild snapper to look at its shape. 1, farmed snapper back rough, not smooth, skirt (also known as the edge of the fly, is located around the snapper, snapper on the taste of the most delicious part) is thin, while the wild snapper back clean and smooth, skirt thick; 2, farmed snapper claw is not hard and not pointy, the color of the whitish, while the wild snapper claw is hard and pointy, the color of the yellowish. 3, farmed snapper belly bottom white Red, more tender, while the wild turtle belly black, stripes clear, dark color. 4, wild turtle oil yellow, feel rich gelatinous, viscosity is very good; while the farmed turtle oil is more white, viscosity is poor. 5, identify male and female to look at the turtle's genitals, beyond the skirt is large and thick that is male, and vice versa for the female. Male snapper body thin meat thick; female snapper body thick, but there are often many snapper eggs in the body, seemingly fat, once cut open, it appears to be thin meat and empty. Purchase of turtle but also learn to recognize the sick turtle and watered turtle. Sick turtle withered, some rotten belly, crawling difficult. There are some traders to the turtle water weight, to sell high prices. Water injection turtle is characterized by: touch the soft and not real, the view of the body strong and not fierce, the move of the dull and not smart, upside down will not turn over.