1. Normal Pipi shrimp should have red skin and lavender meat after being cooked. If Pipi shrimp turns green after being cooked, it may be related to the reproduction of this creature. In the breeding season, Pipi shrimp will produce a special substance, which will turn green if heated. Generally speaking, as long as it is purchased in a normal way, Pipi shrimp can still be eaten.

2. Pippi shrimp are all marine. Shrimp predation originated from Jurassic in Mesozoic, and most species live in tropical and subtropical waters, with a few found in temperate waters. There are all along the coast of China, among which Oratosquillaoratoria, a wide-temperature variety belonging to Squillidae and Oratosquilla, has the widest distribution and the largest yield.

3. Morphological characteristics: Oratosquillaoratoria has a movable trapezoid frontal plate in the center of the front edge of the head breastplate, and there are movable eye nodes and antenna nodes in front of it. The abdomen is wide, * * * six segments, and finally there is a wide and short tail segment with a central ridge on the back and strong spines on the rear edge. The handle of the first antenna is slender, divided into three sections, with three touch whips at the end to control the sense of touch. The handle of the second antenna has two sections, on which there is a touch whip and an oblong scale. Mouth and jaw are very hard, which are divided into molars and incisors, all of which have dentate protrusions, which can cut off and grind food; The tentacles of the maxilla have three nodes, which are not significant and have a sensory effect. The first jaw is small, and the original limb has two segments, and its inner edge has bristles. The second jaw is thin and consists of four segments, with dense hairs on the inner edge. These two pairs of small jaws can help the big jaw shred food. There are eight pairs of appendages in the chest, the first five pairs are jaw feet, and the last three pairs are walking feet (just the opposite of the three pairs of jaw feet and five pairs of walking feet of Decapoda). The first pair of jaws are slender, and the ends of the distal segments are flat and have brush hairs; The second jaw foot is particularly powerful, with a flat end (knuckles) and six sharp teeth, which can be matched with the edge groove of the metacarpal joint. It is a sharp weapon for preying and defending the enemy, and is called a grazing limb; The third to fifth pairs of jaws are shorter than the first pair, and the ends are small claws. These appendages can send the caught food into the mouth. All five pairs of jaws and feet have no external limbs, but the base has round upper limbs. The foot is thin and claw-free, the original limb is three-jointed, and the lower limb is connected with the inner and outer limbs, which is not suitable for crawling. There are a pair of slender connecting rods on the inner side of the base of the male third foot. The first five abdominal segments of the abdomen each have a pair of abdominal limbs, which are composed of handle segments and flat leaf-shaped inner and outer limbs, and have the functions of swimming and breathing. Gills are born at the base of the outer limb and have many branched gill filaments. The inner limb of each abdominal limb has a small inner appendage, which is connected with the small inner appendage on the other side, so that a pair of abdominal limbs are connected into a whole, which is convenient for swimming. The inner limbs of the male's first pair of abdominal limbs are deformed and become grasping devices, which are used to hold the female body during mating. The last pair of appendages in the abdomen are developed tail limbs, including one primitive limb, two outer limbs and one inner limb, which are flaky. There is a strong forked spur on the inside of the original limb, called basal process or double spur, which extends between the inner and outer limbs. Tail fan composed of tail limbs and tail joints can not only swim, but also be used to dig holes and defend against enemies. The mouth of the shrimps is located between the two jaws on the ventral surface. The mouth enters the stomach through the esophagus, then connects with the intestine, passes through the abdomen vertically, and then passes back to the anus. The anus opens on the ventral surface of the caudate segment. The heart is long and tubular, extending straight from the back of the head and chest to the fifth abdominal segment. The heart extends arterial blood vessels to both sides and back and forth, leading to various organs and tissues. The female reproductive pores are paired, and most of them open on the ventral surface of the sixth thoracic segment. The ovaries are located below the heart on the back of the body. When pregnant with eggs, they extend backwards from the head and chest to the tail segment through the abdomen. A pair of male genital holes are located on the ventral surface of the chest terminal segment. The submandibular gland at the base of the second antenna of the head is the excretory organ.