Journal of Tropical Oceanography ›› 2019, Vol. 38 ›› Issue (2): 58-66.doi: 10.11978/2018071CSTR: 32234.14.2018071

• Marine Biology • Previous Articles     Next Articles

Histological studies on development of the digestive system in larval and juvenile Sebastiscus marmoratus

Jiazhe YANG1(), Chuang QI1, Shanliang XU2()   

  1. 1. School of Marine Sciences, Ningbo University, Ningbo 315211, China
    2. Key Laboratory of Applied Marine Biotechnology, Ningbo University, Ningbo 315211, China
  • Received:2018-07-17 Revised:2018-11-01 Online:2019-03-20 Published:2019-04-15
  • Supported by:
    Zhejiang “13th Five-Year” Advantage Professional Construction Project (Aquaculture Major of Ningbo University);Public Technology Application Research Projects of Zhejiang Province (2017C32015)

Abstract:

Sebastiscus marmoratus as a marine economical teleost, research on the development of the larvae and juveniles of this species become important. In this study, the developmental characteristics of digestive system in S. marmoratus from 0 to 50 days post-parturition (dpp) were described by the method of tissue sectioning technique, HE (hematoxylin-eosin) staining and histochemical staining. The results showed that the initial digestive system appeared to have a differentiated buccopharyngeal cavity after parturition. At 2 dpp, the larvae began feeding, and the digestive tube opened to the outside initially, and the larvae entered the endo-exotrophic period. The pyloric caeca appeared at 3-4 dpp, while 5~6 mucosal folds appeared in esophagus, and five mucosal folds appeared in stomach and hepatic cell mass grew. At 5-6 dpp, the yolk sac was completely absorbed, meaning the larvae began getting into exotrophic period Ⅰ (without a functional stomach). Meanwhile, goblet cells were observed in esophagus, and intestine can be divided into promesenteron and hindgut. At 10-14 dpp, circular layers of striated muscle were obviously observed and 7-12 mucosal folds appeared in esophagus; stomach had a basic structure, brush border became clear and there were a few hepatic sinusoids in a bigger liver, which was good for the digestion and absorption of exogenous food. At 28-30 dpp, the gastric glands and gastric pits appeared, which was the signs of the juvenile stage. With the increase of the number of islet cells and zymogen granules, the digestion was greatly improved. At 47-50 dpp, the digestive system gradually improved as a functional and structural one, which resembled that of adults. These results showed that the development of the digestive system in S. marmoratus started early like other ovoviviparous teleosts and was relative with the improving function of its digestion.

Key words: Sebastiscus marmoratus, larva and juvenile, digestive system, histology

CLC Number: 

  • P735.541