milt

Short definition from Wiktionary

Noun

1. 1
   The spleen, especially of an animal bred for food.
2. 2
   The semen of a male fish.
3. 3
   The engorged testis containing a filled reservoir of mature spermatozoa in a male fish.

Verb

1. 1
   To impregnate (the roe of a fish) with milt.