Meaning
白子 (しらこ, Shirako) is Shirako, a Japanese food (special foods, viscera).
What is Shirako?
Milt or soft roe also refers to the male genitalia of fish when they contain sperm, used as food. In Japanese cuisine, the milt (白子 ) of cod ( tara ), anglerfish ( ankō ), salmon ( sake ), squid ( ika ) and pufferfish ( fugu ) are a delicacy.