Histological studies on the digestive system development of the larvae of Acipenser schrenscki and Huso huso ♀× A. schrenscki ♂

Larval digestive organs of Amur sturgeon, Acipenser schrenscki and hybrid sturgeon(Huso Huso .. .. A. schrenscki .. ) hatched out at 17~ 21 .. were successively observed under Olympus microscope after being sectioned. Histological development of yolk- sac, pharyngeal cavity, esophago, stomach, intestine, pyloric caecum, liver and pancreas is described. It shows that the development of the digest ive organs of the two f ishes is similar to several other Acipenseridae f ishes. Characters of the digest ive organs about the two fishes and the relationships among earlier development period, ingestion, digestion and absorption are discussed.