Histogenesis of Hemopoietic Tissues and Immunoglobulin－forming Cells in the Carp， Cyprinus carpio

The anlagen with a few hemopoietic cells was first detected in carp at 2 days post-hatch in the thymus and the pronephros. Hemopoietic tissue in both organs developed progressively, and at 9 days post-hatch they appeared to be nearly matured lymphoid organs. The kidney, the mesonephros, and the spleen also developed as hemopoietic tissues after 4 days post-hatch. A large number of immunoglobulim-forming cells were demonstrated immunocytochemically in the pronephros and also a small number in the mesonephros and the spleen.

Hemopoietic tissue

Immunoglobulin-forming cell

Carp

Teleost