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一、黑变问题与苹果、马铃薯等果蔬因氧化作用而发黄变褐一样,对虾、螃蟹等甲壳类水产品在收购、运输、贮存、加工、出口等一系列商业活动中均会发生黑变。黑变会影响虾蟹产品的外观,降低品质,影响销售,导致经济损失。对虾产品(包括带头虾、去头虾、蝴蝶虾、凤尾虾等)不管是养殖虾还是海捕虾,黑变一般占10%—30%左右,严重影响出口产品的质量。国际上,一般对黑变的虾根据不同程度降价1000—3000美元/吨。
First, the problem of blackening And apples, potatoes and other fruits and vegetables due to oxidation yellow brown, shrimp, crab and other crustaceans aquatic products in the acquisition, transportation, storage, processing, export and a series of commercial activities will occur blackening . Blackening will affect the appearance of shrimp and crab products, reduce quality, affect sales, resulting in economic losses. Shrimp products (including headed shrimp, head shrimp, butterfly shrimp, prawn, etc.) regardless of farming shrimp or sea shrimp, black change generally accounts for about 10% -30%, seriously affecting the quality of export products. Internationally, black shrimp generally reduce prices by 1000-3000 US dollars / tonne according to different levels.