蝦線 [虾线]

Jyutping haa1 sin3
Pinyin xiā xiàn

Definitions (Wiktionary)
  1. noun
    Shrimp/Prawn's digestive system, or the (usually) dark line running down its back. It is removed by some when cleaning the shrimp/prawn.

蝦線 [虾线]

Jyutping
Pinyin xiā xiàn

Definitions (CC-CEDICT)
  1. digestive tract of a shrimp
  2. sand vein