Macrobrachium
Aquarists often regard it as the collective name of the long-armed shrimp family, the beautiful white shrimp ( species), Macrobrachium sinensis (species), and several species of Macrobrachium (genus) are all known as big-eyed thieves.
Macrobrachium is commonly known as green shrimp, river shrimp, big-eyed shrimp, etc. The body is blue-gray in color with brown freckles. The color of this shrimp changes in shades due to different habitats. Generally, the body length of male shrimp is 24-82 mm, and that of female shrimp is 20-76 mm. The male shrimp has a large head, long and thick pincers, and white inclusions in the head. The female shrimp has a much smaller head, smaller pincers, yellow inclusions in the head, and a mature body.
Morphological characteristics of Macrobrachium: developed forehead horns, flat sides, and teeth on both upper and lower edges. The cephalothorax has antennal spines and liver spines, no branchial spines, and a branchial groove. The plastron of the fourth thoracic segment has a central process. There are tentacles on the large forehead. The first two pairs of steps are claw-shaped, the second pair is larger, and males are especially powerful. The last three pairs of knuckles are single-clawed and shorter than the palm joints. The male first abdominal limb has no internal appendages.
Common in tropical and subtropical areas, occasionally living in temperate fresh water, and occasionally living in salt water. Some species hatch in larvae in sea water and can survive in the ocean when they are young.
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