IDENTIFYING CHARACTERISTICS OF IMPORTANT EDIBLE CRUSTACEANS.pptx

Crabs, prawns, crayfish and lobster are examples of edible crustaceans that are among the main sources of nutrient-rich food for people. A crustacean's nutritional value is determined by its biochemical makeup, which includes its protein, amino acids, lipids, fatty acids, carbohydrates, vitamins, and minerals.

1. IDENTIFYING CHARACTERISTICS OF IMPORTANT EDIBLE CRUSTACEANS Dr. Karri Rama Rao Department of Zoology/Fisheries

2. Macrobrachium rosenbergii Phylum: Arthropoda Subphylum: Crustacea Order: Decapoda Genus: Macrobrachium Species: M. rosenbergii Synonymised names Palaemon rosenbergii De Man, 1879 Macrobrachium rosenbergii schenkeli Johnson, 1973 • Palaemon d’acqueti Sunier , 1925 • Palaemon rosenbergii De Man, 1879 Palaemon whitei Sharp, 1893

3. Identifying Characteristics It is also known as the Giant River Prawn. 2. The body of a prawn is composed of three parts: head, abdomen and tail. 3. There are five pair of walking legs at the head part. 4. The male has a strong second pair of periopods .

4. 5. The Male and female maximum reported sizes are 33 cm and 29 cm, respectively. 6. The rostrum is long and slender upward rostrum, with 11-14 dorsal teeth and 8-10 ventral teeth 7. The tip of its telson reaches distinctly beyond the posterior spines of the telson . 8. The adult male has very long second chelipeds in which all segments are elongate and have blunt spines

5. 9. The movable finger of the second chelipeds of the adult male is covered by a dense velvet-like fur (except the extreme tip) but this fur is absent from the fixed finger and the rest of the cheliped 10. Male M. rosenbergii can be differentiated by the appearance of appendixes masculine, gonopores , and associated gonopore flaps ( gonopore complexes).

6. Penaeus monodon Phylum: Arthropoda Subphylum: Crustacea Order: Decapoda Genus: Penaeus Species: P. monodon Synonyms Penaeus bubulus  (Kubo, 1949) Penaeus caeruleus  ( Stebbings , 1905) Penaeus carinatus  (Dana, 1852) Penaeus monodon var. manillensis  ( Villaluz and Arriola , 1938)

7. Identifying Characteristics It is frequently referred to as Tiger shrimp or Black tiger prawn. 2. The rostrum is highly developed, with 7-8 dorsal and 3-4 ventral teeth. 3. This species may be identified by its five pereiopods without an exopod , its carapace lacking longitudinal sutures, and its unarmed telson . 4. Fifth pereiopods (walking legs) without an exopod are the most identifying characteristics of this species.

8. 5. The gastroorbital carina (keel), that occupies up the posterior half of the space between the hepatic spine and postorbital border of the carapace, and the hepatic carina (keel), which is horizontally straight. 6. The body colour and transverse blue-black and yellow stripes might differ depending on the substratum. 7. Adults may grow to a length of 33 cm, and females typically exceed males in size. 8. The carapace lacks longitudinal or transverse sutures, but it always has orbito -antennal grooves, cervical (neck), and antennal carinae (keels). The antennal and hepatic spines are noticeable.

9. Litopenaeus vannamei or Penaeus vannamei Phylum : Arthropoda Subphylum:Crustacea Order: Decapoda Genus: Litopenaeus Species: L. vannamei Synonyms Penaeus vannamei (Boone, 1931) Litopenaeus vannamei (Boone, 1931)

10. Identifying Characteristics 1. Its original habitat is the Eastern Pacific coast of Central and South America, where it is known as the " whiteleg shrimp." 2. The first pair of walking legs, as well as a third thoracic segment that never crosses the second. 3. The rostrum is slightly long and has 2-4 (rarely 5-8) ventral teeth in addition to 7 – 10 dorsal teeth. 4. The bodies are a light grey colour with a yellow stripe on part of the abdomen and a green tail. They lack grooves on their carapace.

11. 6. At the age of 6-7 months, males attain maturity at 20 g and females at 28 g. While postlarvae travel inshore to spend their juvenile, adolescent, and sub-adult stages in coastal estuaries, 7. lagoons, or mangrove habitats, adults live and reproduce in the open ocean. 8. At the age of 6-7 months, males reach sexual maturity at 20 g and females reach it at 28 g and above. 9. It will lay 100 000 – 250 000 eggs with a diameter of around 0.22 mm. 10. About 16 hours after spawning and fertilisation , eggs are deposited.

12. Scylla serreta Phylum: Arthropoda Subphylum: Crustacea Class: Malacostraca Order: Decapoda Genus: Scylla Species: S. serrata Identifying Characteristics Commonly called as Mud Crab and generally very dark brown to mottled green in colour . This species of crab found in the estuaries and mangroves Mud crabs have five pairs of legs, with the front two pairs being modified into large claws, which they use to catch prey and defend themselves.

13. The two hind legs are flattened for swimming. Scylla serrata is   a   swimming crab   with an oval carapace. The carpace bears four triangular frontal teeth between the eyes and nine anterolateral teeth on each side. The chelipeds (claw-legs) are massive and smooth, and longer than the other legs. Male crabs have a “ V ” shaped abdomen while mature females have a dark “ U ” shaped abdomen  

14. Panulirus   homarus Phylum: Arthropoda Subphylum: Crustacea Class: Malacostraca Order: Decapoda Genus: Panulirus   Species: P.  homarus

15. Commonly called as Rock Lobsters They have   compound eyes on movable stalks, two pairs of long antennae, and several pairs of swimming legs (swimmerets) on the elongated abdomen. Body tubular or slightly flattened dorsoventrally ; carapace subcylindrical , laterally rounded or straight, surface spiny, pair of large frontal horns above eyes. Identifying Characteristics

16. Rostrum absent or reduced to small spine; antennae very long, cylindrical, whip-like; legs without pincers and first pair not enlarged; posterior half of tail. A flipper like muscular tail is used for swimming; flexure of the tail and abdomen propel the animal backward. P. homarus   less colourful with more uniform darkish green to reddish brown carapace colour , finely spotted with white. No distinct abdominal bands of light and dark colour ; legs uniform darkish green like the carapace. Light anterior spot present at base of abdominal pleura.