The world **** there are more than 400 kinds of lobster, North America is the most widely distributed continent of lobster, distributed in North America, there are two families (crab shrimp, crayfish family), 12 genera, more than 300 kinds of. In more than 300 kinds of lobsters in most of the economic value is low, of which Cambarellus genus species of the smallest individual, individual weight is rarely more than lg; individual larger (each tail can reach 50-80g) and economically important lobsters have the original crayfish genus Procambams, the crayfish genus Cambarus, the Pacific chelid genus Pacifastacus and fork-limbed crayfish genus Orconectes. Species of the genus Orconectes, of which the crayfish accounted for 70-80% of the entire lobster production.
China is one of the least distributed lobster countries, there are only four species, the Crayfish, Northeast crayfish Cambaroides dauricus, Shi's crayfish C. schrenkii and the Korean crayfish C. Similis, the latter three are only distributed in the three northeastern provinces of China, North Korea and Japan.
2, morphological characteristics
(1) appearance
Lobster body surface is covered with a layer of smooth hard shell, body color is light green, light red. The body is divided into cephalothorax and abdomen, cephalothorax slightly larger, slightly flattened dorsal abdomen, cephalothorax and abdomen evenly connected.
The lobster's cephalothoracic armor back of the anterior part of four spines, the center of the two longer and thicker, from the frontal angle to the back of the extension; the other two are shorter, from the back of the eye spine to the back of the extension. These four spines are the distinctive features that distinguish this shrimp from the freshwater crayfish.
(2) Appendages
The lobster has three pairs of tentacles on the head, which are thick near the head and have small, pointed tips. A pair of tentacles at the outer edge of the head is particularly thick and long, generally longer than the body length of 1 / 3; in the middle of a pair of long tentacles for two pairs of short tentacles, the length of about half of the body length. When perching and crawling normally, all six tentacles are extended forward, and if frightened or attacked, the two long tentacles are bent toward the tail to prevent the tail from being attacked.
The thorax has five pairs of steppers, the 1st-3rd pairs of steppers ending in pincers, and the 4th-5th pairs of steppers ending in claws. The second pair of footsteps is particularly developed and become a very large chelipeds, male chelipeds are more developed than the female, and the male lobster has a bright red film on the outer edge of the front, very conspicuous. Females do not have this red film, which has become an important feature of male and female distinction.
The tail has five powerful discretionary tail fan, female shrimp in the egg holding period and incubation period, the tail fan are bent inward, crawling or by the enemy, in order to protect the fertilized eggs or baby shrimp from damage.
(3) Habitat
① benthic
Lobsters like to live in water plants, branches, stone gaps and other hidden things. The shrimp day and night, do not like bright light. Under normal conditions, during the day, more hidden in the water deeper or in the shelter, rarely active, the evening after the sun went down began to move, more gathered in shallow water crawling for food or looking for a mate. If frightened, quickly flee back to deep water. The shrimp like to crawl, do not like to swim, foraging and activities crawling forward, frightened or encountered enemies quickly backward, jumping to avoid.
② water
Lobster has a strong tendency to water flow, like new water, live water, against the water upstream, and like to cluster life. In the breeding pool often gathered in groups around the inlet. Heavy rain, the shrimp can reverse the flow of water on the shore for a short stay or escape, the water environment is not suitable will also climb the shore habitat, so the farm site should have anti-escape fencing facilities.
③ aggressive
Lobster aggressive nature, in the feed shortage or fight for habitat cave, often appear strong bully weak, bully small afraid of big phenomenon.
The regenerative capacity of the larvae is strong, the loss of part of the 2nd molt regeneration of a portion of the molt, several moults will be restored, but the newborn part is shorter than the original. This self-cutting and regenerative behavior is a protective adaptation.
(4) hole-digging habits
Lobsters like to dig holes, and good at digging holes.
① digging depth and speed The depth of lobster digging is a key factor in determining the degree of harm. According to our field measurements of 35 cases of lobster burrows, the depth of most of the burrows in the 50-80 cm, accounting for about 70% of the measured burrows, some of the depth of more than 1 meter, we measured the longest one burrow up to 2.1 meters. Typically, lobster burrows that are oriented horizontally in a planar direction are the only ones with depths greater than 1 meter, while burrows that are oriented vertically downward in depth are generally shallower. Lobster burrowing speed is very fast, especially in the put into a new living environment is especially obvious. Dafeng lobster test pool A, put into the lobster after a night of observation, in sandy soil conditions, most of the lobsters dug a new hole depth of more than 30 centimeters.
② location of lobster holes Lobster digging holes hole location is usually chosen at the level, but this choice is often due to changes in the water level and make the hole higher or lower than the level, so generally 20 centimeters above and below the surface of the water, the lobster holes the most. However, the location of lobster digging hole selection is not very strict, in our test base, in the water pool ridge, water slopes, and shallow areas of the bottom of the pool are lobster burrows, more concentrated in the lush water plants.
③ survival environment on the impact of lobster burrowing Water substrate conditions on the lobster burrowing impact is more obvious, in the lack of organic matter in the substrate of sandy soil, lobster burrowing phenomenon is more, and less hard soil burrowing. In the water quality is more fertile, more bottom silt, organic matter-rich conditions, lobster burrows significantly reduced. However, regardless of the survival environment, the number of lobster burrowing increased significantly during the breeding season.
(5) adaptability
① environmental requirements lobster has a strong ability to adapt to the environment, a variety of water bodies can survive, whether it is lakes, rivers, ponds, gullies, paddy fields can survive, and even in some of the fish are difficult to survive in the water body can survive. Lobster resistance to low oxygen capacity is strong, in the water body of the lack of oxygen under the environment it can climb ashore for gill respiration in order to maintain survival. Water quality PH value in the range of 5.8-9, dissolved oxygen below 1.5mg / L can still survive normally. Normal growth requires more than 3ml / L of dissolved oxygen.
② water temperature
Lobster growth appropriate water temperature of 24 ℃ -30 ℃, when the temperature is lower than 20 ℃ or higher than 32 ℃, the growth rate decreased, the water temperature is 15 ℃ below the survival rate of juveniles is extremely low. Feeding waters day and night temperature difference can not be too large, baby shrimp young shrimp day and night temperature difference should not exceed 3 ℃, adult shrimp do not exceed 5 ℃, otherwise it will cause significant losses.
In the Pearl River Delta and coastal areas of South China, generally can be natural overwintering, in order to prevent the attack of a large cold wave, can be placed in the wintering shrimp in deeper pools, and in the north-west corner of the pool to take the wind wall or cold shed. Embryonic development of suitable water temperature of 22 ℃ -32 ℃, if you keep 28 ℃ -30 ℃, incubation time can be greatly reduced.
③ PH value
Lobster suitable PH value range of 5.8-9, but in the breeding incubation period requires a PH value of 7.0 or so, the amount of dissolved oxygen 3mg / L or more. However, it is very resilient, can live in some domestic sewage, light industrial wastewater, in the pesticide application areas of the field ditch, channels are also distributed.
(C) food and growth
1, food
Lobster is a partial animal omnivore, but the food in different stages of development slightly different. Hatched larvae to its own survival of the yolk for nutrition, soon after the ingestion of rotifers and other small zooplankton, as individuals continue to grow, feeding on larger zooplankton, benthic animals and plant debris, adult shrimp both animal and plant food, the main food plant debris, animal carcasses, but also ingested water earthworms, rocking mosquito larvae, small crustaceans and a number of aquatic insects. In the case of artificial culture, the larvae can be fed to the articulate larvae, spirulina powder, etc., adult shrimp can be fed with artificial feed, or artificial feed, supplemented by animal and plant debris.
2, molt and growth
Lobster is through the molt to achieve growth, after the molt of the new body shell in 12-24 hours after hardening. In the water temperature of 25 ℃ -30 ℃ conditions, feeding 6-8 months, weight up to 60-150 grams. Lobster growth trend is: from hatching to the weight of 20 grams of this stage, the growth rate is accelerated growth; in the stage of reaching 50-100 grams, the rate of its growth to remain at a relatively stable level, more than this stage, the growth rate will be a declining trend. Thus forming an inverted u-shaped growth curve. Molt long molt and reproductive molt two kinds of juvenile shrimp from the mother, quickly into the first molt, replaced with soft wrinkled new skin, and rapid growth of water intake, this is the growth of molt, by the larvae to adult **** molt 11 times. Female shrimp sexual maturity will begin to reproductive molt, and then each time before mating and spawning should be reproductive molt.
(D) reproductive habits
1, male and female identification
lobster male and female distinction, mainly through the following methods of identification:
1) individual shrimp of the same age, the female shrimp than the male shrimp;
2) body length of similar parent shrimp, male chelipeds thicker than female, and male chelipeds carpal and palpal joints of the spines on the section of the long and obvious;
3) female shrimp 1st abdominal limb degeneration, very small, the 2nd abdominal limb is normal, male shrimp 1st, 2nd abdominal limb becomes tubular, longer, for the reddish color, 3rd, 4th, 5th abdominal limb for the white color, this is the most obvious between male and female in the appearance of the most obvious discriminatory features.
2, sexual maturity
Lobster in the natural environment 6-12 months of age to reach sexual maturity, has reached sexual maturity of the individual weight is generally 30-100 grams. In artificial feeding conditions, generally 6 months to reach sexual maturity. Parent shrimp of the same age, generally male shrimp individuals slightly larger than the female shrimp. Lobster groups kept in the same pond, the male and female sex ratio is close to 1:1.
3, reproduction
Lobster 9-12 months of age to maturity, the mating season is generally in late April - July, the peak of the group mating in May. Mating female shrimp lying on her back on the water, male shrimp bit on its lobster feet clamped on the female shrimp forefoot, step foot to hold the female shrimp will be inserted into the female body, mating time 10-30 minutes. 3-10 hours after mating, the female shrimp began to spawn, for a one-time spawning, the output of eggs adhering to the setae of the abdominal foot. Holding the amount of eggs about 500-1500, varying with the size of the individual. Embryonic development length and water temperature is closely related to the water temperature, the water temperature is high incubation time is short, the water temperature is low incubation time is prolonged. Hatched baby shrimp still attached to the swimming feet of the parent shrimp, under the protection of the mother's growth for a period of time. In the abdomen of the mother's swimming feet are attached to the growth to different stages of lobster larvae, the largest lobster larvae body length of 1.0-1.1 cm. From the early fall of the first year after the hatching of lobster young shrimp, lobster larvae growth, development and overwintering process are attached to the abdomen of the mother, to the spring of the second year before leaving the mother's life. Lobster this way of breeding offspring, to ensure a very high survival rate of offspring.
4, spawning
Lobster is a multi-year spawning type. When the water temperature rises to 20 ℃ or more, the shrimp will start spawning, spawning season in the eastern part of Guangdong Province can last up to 6 months, can be spawned 3-4 times a year. Egg production varies with the size of the individual and the degree of gonadal development, generally 300-1000 eggs per spawn. Individuals with larger female shrimp to carry more eggs.
5, embryonic development
Lobster fertilized eggs adhere to the female abdominal limbs for embryonic development, 5-8 weeks after hatching out of the larvae. Fertilized egg development speed and water temperature, high temperature incubation time is short. Fertilized eggs initial egg diameter of 2 mm, with the progress of embryonic development, fertilized eggs in different developmental periods show regular changes in color, from the initial light creamy white in turn to dark brown, black eyes, and finally to orange-red, when the larvae are about to hatch. In 32 ℃ water temperature, fertilized eggs in the process of development of the above color appears in the following order: light cream 1-5 days; dark brown 12-14 days; the appearance of the eye 20-33 days; orange-red 28-35 days; rupture of the membrane and detached from the mother 35-40 days.
6, larval development
The hatchling lobster larvae and adult body structure is basically the same, the average body length of about 9.5 millimeters, still continue to climb on the abdominal limbs of the female shrimp for 1-2 weeks, during which time the larvae will occasionally leave the mother's activities. Newly hatched larvae rely on the yolk sac for nutrition until they are fully independent after 3 weeks of incubation. Under the right conditions, 50-60 days after the larvae by 5-8 times molt, weight up to 0.5-2 grams, can be released into the pond for adult shrimp farming. Common shrimp mayfly species mantis shrimp mantis shrimp mollusc class shrimp subclass of the common name. Shrimp subclass in the only stomatopods, which, in addition to all the fossil species of ancient shrimp mayfly family, the living species are divided into four general family: deep shrimp mayfly general family, finger shrimp mayfly general family, shrimp mayfly general family and the piano shrimp mayfly general family. All are marine. Shrimps originated in the Jurassic period of the Paleozoic Era, and there are more than 300 extant species. The vast majority of species live in the tropics and subtropics, a few in the temperate zone. China's coast are, the South China Sea, the most species, has found more than 80 species. Shrimp mayfly body narrow long tube, slightly flat, cephalothoracic armor only covers the head and the chest of the first 4 sections, the last 4 thoracic segments exposed and can move. There is a pair of compound eyes with stalks. These two somites are movable at the anterior end of the head. Abdomen broad, ***6-segmented, ending in another broad, short caudal segment, which forms the caudal fan with the last pair of abdominal appendages. The mouth is located between the two ventral jaws. The anus opens on the ventral surface of the caudal segment. Shrimp mayfly burrowing, often in the shallow sea sandy bottom or muddy sand bottom dug hole, hole more U-shaped. Stomatopods are carnivorous, mostly prey on small invertebrates; these animals can rub the ventral surface of the caudal segment with the caudal limb or strike with the swept limb and make sounds. The flesh and ovaries of the larger species of the family Gastropoda and Gymnaeidae are edible and tasty, and the freshness of the mature ovaries of stomatopods far exceeds that of the Chinese shrimp. Smaller individuals are often used for yellowtail and octopus. The most abundant is the mouth shrimp mayfly, China's largest production in the Yellow Sea and Bohai Sea area. They attack their prey in a manner very similar to the land mantis, so Westerners commonly called them mantis shrimp (Mantis shrimp). Local names; Pipi shrimp, shrimp rake, shrimp male camel, Lai urine shrimp, mantis shrimp, crawling shrimp, mouth shrimp mayfly, rich shrimp, pipa shrimp. Shrimp mayfly is a nutritious, juicy and tender seafood. Its meat contains more moisture, meat flavor sweet and tender, light and soft, and has a special attractive flavor. Spring is the spawning season every year, and this is the best time to eat. Fat shrimp mayfly brain is full of cream, meat is very tender, delicious flavor, but unfortunately more shell meat less. But its protein content of up to 20%, fat 0.7%, as well as vitamins, chloric acid, inosinic acid, aminopropionic acid and other nutrients needed by the human body. Shrimp mayfly warm, sweet taste. It has the effect of tonifying the kidney and strengthening the yang, and removing the toxin from the breast. Family: Scolytidae Chinese name: Striped-tailed near-shrimp mayfly Synonymy: Squilla fasciata / Squilla subfasciata Main morphological characters: eyes with double cornea, obviously wider than the eyestalks. Shell smooth. Cephalothoracic armor narrow and with sharp anterior lateral angles. The cephalothorax does not have a central ridge, but a longitudinal groove at the position of the median ridge. The phalanges of the catching limb have six teeth. The fifth thoracic segment has only one lateral protuberance, pointing forward into a pointed tooth. The sixth and seventh thoracic segments have a broadly rounded lateral process. The lateral margin of the eighth thoracic segment is more rounded. There is no subcentral ridge from the fifth thoracic to the fifth abdominal segment. Caudal peduncle with long central spine, subcentral spine, and several pairs of short longitudinal spines. The inner margin of the inner fork of the caudal limb has 7-14 small spines; the outer limb of the caudal limb has 7-10 movable spines. Body color: Body grayish brown to olive green with irregularly mottled surface. The tips of the caudal segmental basal spines are dark red. The end of the outer limb of the caudal limb is dark brown. Caudal segment not spotted. Body length: Small to medium sized, up to 100 mm long. Distribution: Distributed in the western Indo-Pacific region, from the western Indian Ocean to the Philippines, Vietnam, Hong Kong, Taiwan, China, Japan, New Caledonia and Australia. HABITAT: Inhabits sandy or gravelly bottoms in water depths below 55 meters. Family: Gastropoda, Chinese name: Squilla multicarinata Synonymy: Squilla multicarinata Main morphological characters: Eyes with double corneas, less than 1/3 as wide as the length of the cephalothorax. eye scales are not bifurcated. Eyestalks not crested. Cephalothorax with normal amount of longitudinal ridges in addition to numerous incidental longitudinal ridges. Central ridge of cephalothoracic armor distinct, but not interrupted by the base of its forks. Cephalothorax with large jaw whiskers underneath. Phalanges of prehensile limbs with five teeth. Fifth thoracic segment with bilaterals and transverse ridges on both sides of midline of thoracic segment. The entire body from the sixth thoracic to the sixth abdominal segment is covered with dense longitudinal ridges. Each longitudinal ridge is terminated by a spine. The anterior side of the caudal peduncle is rounded with a pointed tip. Body coloration: Body brownish yellow with dark square patches on the second and fifth abdominal segments. The ends of the outer limbs of the caudal limbs are black. Body length: Medium-sized, up to 90 millimeters in length. Distribution: From Japan to India, including China, Hong Kong, Vietnam, Philippines and Myanmar. HABITAT: In muddy bottom waters up to 50 meters deep. Family: Gastropoda, Chinese name: Squilla decorata Synonymy: Squilla decorata / Clorida juxtadecorata Main morphological characters: Eyes tiny, bicorneal, narrower than the eyestalk. The eyestalk is short and swollen. Frontal horn plates short, broader than long, and with rounded edges. Anterior lateral horns of cephalothoracic armor pointed; but without central and median ridges. Cephalothorax with large jaw whiskers underneath. Phalanges of prehensile limbs with five teeth. Fifth thoracic segment with only one pointed and forward curved lateral process. Sixth and seventh thoracic segments with broadly rounded lateral processes. First to fifth abdominal segments with distinct subcentral ridges. The base of the caudal peduncle has many elevated ridges and nodules in addition to the postanal ridges; however, neither the central ridge nor the lateral margins of the caudal peduncle are nodular. The lateral margins of the outer limbs of the caudal peduncle have six or more movable spines. BODY COLOR: Body creamy white to light brown, not distinctly colored. Body length: small to medium, up to 95 mm. Distribution: East and South China Seas, Hong Kong, Tokyo Bay, Vietnam to Adaman Island, Thailand. HABITAT: In muddy waters at depths of less than 30 meters. Family: Gastropoda, Chinese name: Squilla foveolata Synonymy: Squilla foveolata Main morphological characters: Eyes small, with double cornea, slightly narrower than the eyestalks. Cephalothorax and ventral dorsum covered with rough reticulate ridges. Cephalothorax with normal amount of ridges, but hidden by reticulate ridges. Phalanges of prehensile limbs with 6 teeth. Fifth thoracic segment with small, sharp bilateral projections. Bilateral process of sixth thoracic segment broadly rounded. Anterior lateral process of seventh thoracic segment is thin and pointed, while posterior lateral process is broadly rounded. Ventral segments also with normal amount of elevated ridges. Caudal peduncle with several rows of curved incidental longitudinal ridges. Body Color: The dorsum and caudal fan are grayish-purple. Body length: Medium-sized, up to 105 mm. Distribution: Australia, Borneo, Northwest Indonesia to Burma, Vietnam, Hong Kong and China. HABITAT: Habitat: Soft muddy bottom waters up to 50 meters. Family: Acanthocephalidae, Chinese name: Wu's mouth shrimp mayfly Synonymy: Squilla woodmasoni / Oratosquilla woodmasoni Main morphological characters: Eyes are large and bicorneal, less than 1/3 of the length of the cephalothorax, frontal plate is short and broad. Cephalothorax with normal amount of elevated ridges; central ridge interrupted by forked fissure, which is absent or inconspicuous. Phalanges of capture limbs with 6 teeth; long segments with sharp, long articulated spines. Fifth thoracic segment with fine and sharp bilateral projections. Sixth and seventh thoracic segments with bilateral projections extending outward. Eighth thoracic segment with only unilateral protuberance. Neither side of central ridge of caudal peduncle with nodal rows. The lateral margin of the outer limb of the caudal limb has 7-10 movable spines. Body coloration: The body is light green with reddish-brown ridges. The dorsal center of the caudal peduncle is maroon with yellow posterior margins; the basal spines are pink. The outer and inner limbs of the caudal peduncle are blue. Body length: medium to large, up to 155 mm. Distribution: Western Indian Ocean to Indonesia, Vietnam, Hong Kong, Taiwan, China, Japan, Philippines and Australia. HABITAT: Flat, sandy and muddy shallow bays or near-shore waters up to 50 meters. Family: Ephemeroptera Chinese name: Squilla harpax Synonymy: Squilla harpax / Harpiosquilla japonica / Harpiosquilla intermedia / Harpiosquilla malagasiensis / Harpiosquilla paradipa Primary form Characteristics: Eyes with double cornea. The frontal plate is triangular with an elongated anterior end. Cephalothorax with a central ridge, its posterior margin y concave inward. Phalanges of trapping limbs with 8 teeth; outer margin of metacarpal segment with a row of elongate and straight spines. Fifth thoracic segment with rounded posterior margin. Subcentral and median ridges of sixth to eighth thoracic segments without spines. First to fifth abdominal segments with dwarf subcentral ridges. Anterior margin of exopod of caudal limb with 8 - 10 movable spines. Body coloration: Dorsum light brownish blue. Ridges and posterior margins of body segments dark brown. The subcentral ridge of the sixth abdominal segment is dark green. Caudal peduncle has a pair of dark spots on either side of the central ridge; caudal peduncle basal spine is green. The margins of the inner limb of the caudal limb are dark brown, while the outer limb is yellowish brown. Length: Large, up to 260 mm long. Distribution: Widespread in the Indo-Pacific region, from the Red Sea and Western Indian Ocean to Japan and Australia, including China, Hong Kong, Taiwan, Philippines and Vietnam. HABITAT: Inhabits muddy and sandy bottom waters at depths of less than 70 meters. Family: Gastropoda, Chinese name: Long-forked mouth shrimp mayfly Synonymy: Squilla nepa / Oratosquilla nepa Main morphological characters: Eyes with bicorneal cornea. The frontal horn plate is rounded and has no central ridge. The central ridge of the cephalothoracic armor is not interrupted by the forked fissure, which is long and splits behind the dorsal points. Phalanges of the traps with six teeth. The fifth thoracic segment has a double lateral protuberance. Subcentral ridge of fourth abdominal segment usually with posterior spine. The anterior margin of the exopod of the caudal limb has 8 - 10 movable spines. Body coloration: The dorsum of the body is gray-green. All ridges, furrows and posterior margins of body segments are brownish green. The central ridge and lateral margins of the caudal peduncle are dark green. The basal spines at the end of the inner and outer forks of the caudal limb are reddish. The caudal segment of the outer limb of the caudal limb is yellow. Body length: Medium to large, up to 165 mm. Distribution: Western Pacific Ocean, from China, Taiwan and Hong Kong to the western Indian Ocean and Red Sea, including New Caledonia, Philippines, Malaysia, Vietnam, Polynesia and Australia. Habitat: Flat sandy or muddy bottom waters in water depths below 25 meters. Family: Gastropoda, Chinese name: Mouth shrimp mayfly Synonymy: Squilla oratoria / Squilla affinis Main morphological characters: Eyes with bicorneal cornea. Frontal horns with broad plates and rounded tips. The central ridge of the cephalothoracic armor is not interrupted by the forked fissure, which splits before the dorsal point. Phalanges of trapping limbs with six teeth; outer margin of long segment with long articular spines. Fifth to seventh thoracic segments with bilateral lateral processes. Anterior lateral process of fifth thoracic segment not only sharp and elongate, but also projecting anterolaterally; its posterior lateral process smaller and projecting laterally. Anterior lateral process of sixth and seventh thoracic segments blunt, elongate, and projecting laterally; its posterior lateral process broader and triangular. Subcentral ridge of fifth and sixth abdominal segments spiny; median ridge of fourth to sixth abdominal segments spiny. The anterior margin of the outer limb of the caudal limb is armed with 7 - 9 movable spines. Body color: Dorsum light brown. Cephalothoracic armor, thorax and abdominal ridges dark red. Central and basal spine ridges of caudal peduncle dark brownish green; basal spine tips red; subcentral and median teeth yellow. The posterior end of the outer limb of the caudal peduncle is yellow with a dark inner margin. Body length: medium to large, up to 185 mm. Distribution: Southern Russia, Japan, China south to Hong Kong, Vietnam and southeastern Australia. HABITAT: Inhabits muddy, sandy bottoms in water depths up to 60 meters. Family: Gastropoda, Chinese name: Broken-spine mouth shrimp mayfly Synonymy: Squilla interrupta / Oratosquilla interrupta Main morphological characters: Eyes with double corneas. The frontal horn plate is broad and quadrangular. The central ridge of the cephalothoracic armor is clearly interrupted by a forked cleft. Phalanges of trapping limbs with six teeth; outer margin of long segments with long segmental spines; carapace ridges divided into two equal rounded protrusions. Fifth and sixth thoracic segments with bilaterals. Subcentral ridges of fifth and sixth abdominal segments with spines; median ridges of fourth to sixth abdominal segments with spines; lateral ridges of third to sixth abdominal segments with spines; marginal ridges of first to fifth abdominal segments with spines. The anterior outer edge of the outer limb of the caudal limb is armed with 7 - 9 movable spines. Body color: Dorsum light olive green. Cephalothoracic nail grooves dark green; ridges dark red. Posterior margin of body segments dark green; ridges green. Central ridge of caudal peduncle with a brown spot; tip of basal spine red. Outer extremity of caudal limb yellow. Body length: medium to large, up to 160 mm. Distribution: East of the Persian Gulf to Vietnam, Hong Kong, Taiwan, China and Australia. Habitat: Sandy or muddy bottom waters up to 25 meters. Reporting Answer added 2009-09-09 23:37 Shrimp
There are many types of shrimp, mainly divided into freshwater shrimp and saltwater shrimp two kinds of shrimp. Our common green shrimp, river shrimp, grass shrimp, crayfish, etc. are freshwater shrimp; shrimp, prawns, prawns, prawns, prawns, prawns, etc. are saltwater shrimp.
Shrimp is one of the high protein content of food, containing 20% protein, fish, eggs, milk, several times to dozens of times.
Shrimp, compared with fish, is a nutritionally balanced source of protein, although it does not contain a high level of valine, one of the essential amino acids. In addition, shrimp contain glycine, and the higher the level of this amino acid, the sweeter the shrimp.
Shrimp has very little fat compared to fish and livestock, and contains almost no animal sugars as a source of energy.
Shrimp in the cholesterol content is high, but the good thing is that it is also rich in taurine that can lower the body's serum cholesterol; shrimp is rich in zinc, potassium, iodine, magnesium, phosphorus, calcium and other trace elements and vitamin A and other ingredients. Beneficial to taste disorders, growth disorders, skin discomfort and sperm deformities. It can also prevent arteriosclerosis, which is good for preventing hypertension and heart attack. Shrimp also has a strong lactation effect on children and pregnant women.