Milt a.k.a. soft roe or white roe is the sperm-containing fluid in the testis of male fish. Like fish roe, milt of certain fish species can be used in cooking.
In picture above: tiny, fresh milt sacks removed from fresh Baltic herring.
A whole milt sack can be either smoked, pickled, cooked usually poached or breaded and fried and eaten sliced or chopped on canapés or mixed in salads, soups and stews.
Cooked, unflavoured milt has a smooth and soft, creamy texture and a mild flavour.
In picture on left: a smoked milt sack removed from smoked Baltic herring.