Question: When did Hermann Von Ihering's father die?
Sentence (from "Rodolpho von Ihering"): From 1932 until 1937 Ihering was the head of the Technical Commission of Fisheries of the Nordeste, assisting rapid growth in the pisciculture in that region and in the world, through the development of hypophysation, a technique of artificially encouraging fish to reproduce by removing the hypophysis or pituitary gland from a fish, preparing it and then injecting the preparation into another mature fish, of either sex, to promote final maturation and spawning.
Relevant evidence: No