Wenyu is produced in many sea areas. It is said that only the Huanghekou has the freshest clams, and the export volume is also the largest. This shell is twice as thick as the thumbnail cover, and the native of the Yellow River mouth is called the clam. A white streak without markings is called white pheasant. The Yellow River Mouth is the top grade in the middle of the country. Because of its high quality and delicious taste, it is favored by consumers at home and abroad. Many people who love food often come here to enjoy the magnificent scenery of the Yellow River and enjoy the delicious taste of Wenyu. It’s really beautiful! The “The First Freshest in the World” is the main variety of foreign exchange earned by the export of Hekou District in Dongying City.

Yellow River mouth Wenyu quality technical requirements (a) provenance. Curtain is a Meretrix meretrix. (2) Breeding environment. The water depth is less than 15m, and the water quality meets the above-mentioned two types of offshore waters in the national marine water quality standard. The salinity is 20‰ to 35‰, the transparency is 35 cm to 55 cm, the water temperature is -0.5 °C to 27.5 °C, and the dissolved oxygen is 4 mg/L. Above, the bottom quality is soft and the fine sand content is 60% to 80%. (3) Technical conditions for increasing aquaculture. 1. Seeds: Choose natural seedlings produced in the protected areas or originate from provincial-level stocks. The seedlings are 1.5cm to 3.0cm long. 2. Bait: rely on phytoplankton and organic debris in the natural sea area as food, no feeding, no fertilization, no use of drugs. 3. Increasing aquaculture: Management in strict accordance with the aquaculture technical operation rules, the proliferation density is ≤18 per square meter. According to the investigation of Wenyuzeng farm resources, when the density is less than 5 particles per square, artificial proliferation is carried out. Breeding density: ≤ 200 capsules per square meter. 4. Environmental and safety requirements: The prevention and control of the breeding environment and epidemic diseases must comply with relevant national regulations and must not pollute the environment. (4) Harvesting. (1) Harvest time: May or May in spring or September and October in autumn. (2) Harvesting specifications: ≥ 4.5cm. (5) Temporary maintenance. The collected clams are kept in the holding pool before the sale. The water in the holding pool is 1m to 1.5m deep, and the bottom is about 30cm thick. The shed is 2~5 tons per 667m2 (mu). It is cleaned or recycled water after sedimentation and sand filtration. It is kept for more than five days. After the sand can be listed for sale. Holding time ≤ 20 days. (6) Quality characteristics. 1. Specifications and quality: (1) Individual weight ≥ 40g, shell length ≥ 4.5cm, ≤ 25 per kilogram. (2) Meat quality: milky white, compact and elastic. The boiled test meat is milky white, the female gland is milky white, and the male gland is pale yellow. The meat is delicious, tender and smooth, the soup is white, the taste is refreshing, no smell, no sediment. 2. Sensory requirements: The project requires the appearance of the shell surface to be smooth, hard, complete, no deformity, no attachments, a layer of red, brown and black, smooth and lacquered shell; the veins are clear, the pattern is gorgeous, by The top of the shell begins with a serrated, point-like brown band, no radiating ribs, and neatly sized. Individual vitality double shell closure is strong; the ability of submerged sand is strong, and the potential for submerged sand is not less than 95%. Impurities have no foreign impurities, no empty shells, no sand in the shells.

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Producers within the scope of protection of the geographical indication products of the Huanghekou Wenyu may submit an application for the use of the “Special Mark for Geographical Indication Products” to the Quality and Technical Supervision Bureau of the Hekou District of Dongying City, Shandong Province, which shall be approved by the General Administration of Quality Supervision, Inspection and Quarantine.