Neo-prawn with knife forehead is commonly known as mud prawn, hemp prawn, tiger prawn, tiger prawn, sand prawn, red claw prawn and Lu prawn, and it is called metapenaeus ensis commercially. It belongs to Arthropoda, Crustacea, Decapoda, Swimming suborder and Penaeidae. The maximum length can reach 19cm.

Shrimp in coastal shallow water has the advantages of strong omnivorousness, wide temperature, wide salt, rapid growth, strong disease resistance and so on, and it can withstand hypoxia and has the habit of diving to the bottom. Because of its thin shell and fat body, the meat is tender and delicious and can be sold alive, it is favored by consumers. It is an excellent variety of "shrimp cultured lightly" at present.

Native to China, Japan, Philippines, Malaysia, Indonesia and Australia, mainly distributed in the east coast of Japan, the East China Sea and the South China Sea of China, the Philippines, Malaysia, Indonesia and Australia. Widely distributed in coastal waters south of Shandong Peninsula in China. The Philippines, Malaysia, Indonesia and Australia are also distributed.

Extended data

Morphological characteristics of sea shrimp

Shrimp is long, with flat sides. The female is about18 ~ 24 cm long, the male is slightly shorter, the body is transparent, the female is brown-blue, and the male is slightly yellow. The whole body is covered with carapace. The breastplate is hard and wide, with a sharp sword zygoma extending from the center of the front end and 7 ~ 9 teeth on the upper edge; The lower edge has 3 ~ 5 teeth.

There are 1 pairs of eyes with stalks on the lower sides of the forehead, and 5 pairs of appendages on the head. The first 1 and the second pair become two pairs of whip antennae, and the second pair is very long. The other three pairs of feet are 1 pair of large jaws and 2 pairs of small jaws, which are part of the mouthparts.

There are 8 pairs of chest appendages, of which 3 pairs become feet, which are part of mouthparts, and 5 pairs are walking feet. The ends of the first 3 pairs of walking feet are all pincers, and the third pair is the longest. The last two pairs of ends are claw-shaped.

The abdomen has 7 segments, which are obviously segmented and can be flexed; Six pairs of abdominal appendages; The first 1 pair of female inner limbs is extremely small, and the male becomes a genitalia. The sixth pair is caudal limb, short and thick, and the caudal fin is synthesized with the 7th caudal segment of abdomen.

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