Male crabs don't actually have crab yolk.

People see male crabs with yellow parts, but in fact that is only the hepatopancreas of male crabs, not crab yolk. The gonads of male crabs are mostly spermathecae, which increase dramatically in size during sexual maturity to form a gelatinous crab paste that is white in color, but like female crabs, there is a hepatopancreatic organ right next to the spermathecae of male crabs, which is yellow in color after steaming or boiling, and looks just like crab roe, but with a different texture.

The difference between crab yolk and crab paste:

The taste is different: crab yolk tastes like a kind of sandy granularity, a bit like the flavor of egg yolk, but more delicious than egg yolk. The composition of crab paste is more delicate and dense, and when it is contained in the mouth and slowly melted, this flavor can be gradually revealed.

Different attributes: Crab roe is only found in female crabs, while crab paste is only found in male crabs, and there is no crab roe in male crabs. Crab yolk is the ovaries and digestive glands in female hairy crabs, orange in color and especially tasty. Crab paste refers to the most nutritious part of male crabs. The white slimy part of the male crab is the crab paste, which is the parasympathetic gland of the male crab, and the yellow one is the hepatopancreas.

The color is different: crab yolk is yellow in color and bright orange when mature. And crab paste is actually fat to some extent. Crab paste is produced centrally during the male crab's wintering period, during which time the fat builds up. Crab paste is located between the shell and the lump, and is usually white and sticky in color, becoming translucent when cooked.

Components are different: first, crab yolk does contain egg cells that have not been discharged from the body, but there are other hairy crab organs, glands, tissue fluid and other substances, not simply crab eggs. Crab paste is a sign of the strength and maturity of male crabs. In its natural state, crab paste is greenish-white, translucent and jelly-like. When steamed, it is translucent and a bit greasy.