T/CMHXXH 001-2019 Clear water crab of Chongming Island

Scope

Main technical content: 4. Technical requirements 4.1 Grading Chongming clearwater crabs are divided into five grades, as detailed in Table 1. Table 1: Grade requirements Grade Body weight (g/crab) Male Female Superior ≥250 ≥200 First grade 225–249 175–199 Second grade 200–224 150–174 Third grade 175–199 125–149 Fourth grade 150–174 100–124 4.2 Characteristic requirements The crab shell is a hard carapace covering the dorsal side of the head and thorax, which is greenish-blue in color and has several wart-like protrusions on its surface. The front edge has four frontal teeth, with a U- or V-shaped indentation in the middle, and four side teeth on each side of the front. The border between the carapace and the abdomen is relatively smooth. The lower cover of the head and thorax is the abdominal carapace, which is gray-white in color. There is a concave abdominal carapace groove in the center of the abdominal carapace, surrounded by dense villi. The abdomen is a flat, sheet-like structure that folds and adheres tightly to the ventral side of the head and thorax. There are a total of five pairs of appendages, with the first pair called "chelae" (claws) and the palmar segments densely covered with villi. The remaining four pairs are called "ambulacra" (walking legs). 4.3 Sensory requirements The sensory requirements should meet the requirements of Table 2. Table 2: Sensory requirements Item Indicator Appearance Greenish-blue back, gray-white belly, and yellow claws. Exterior A smooth crab shell with wart-like protrusions on the surface of the carapace, intact, and full of roe. Appendages Complete chelae and ambulacra. Odor No odor. Vitality Strong physical constitution, strong mobility, and quick response. 4.4 Physicochemical indicators The physicochemical indicators should meet the requirements of Table 3. Table 3: Physicochemical indicators Item Male crabs Female crabs Fat co

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