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Histological, morphological and physiological studie on the ontogenic development of digestive tract in Alburnus chalcoides

By Masrour Zakeri-nasab

Abstract

Alburnus chalcoides is a member of the Cyprinidae, which is considered as biologically, ecologically and economically important fish. Sampling of this fish was done randomly from the first day after hatching to pre-puberty at different intervals. The growth of this fish was investigated morphologically and histologically by Hematoxylin-Eosin staining method, and the secretion of gastrointestinal mucosal layers of the cells from carbohydrates was studied by histochemical analysis by periodic acid scavenging. To study the physiology of fish, its digestive enzymes were studied. Anatomical study on this fish showed that its digestive system consists of two major parts of the esophagus and intestines. In the early days of the digestive tract, it was a simple and simple tube in which mucosal secretions were not observed, but after the appearance of the Goblet cells, this activity began and a layer of neutral polysaccharide compounds was observed on the gastrointestinal tract. The presence of neutral polyunsaccharide secretions in the gastrointestinal mucosa has shown that it plays a role in the digestion and absorption of food and is important in protecting the epithelial layer of the digestive tract and passing food. In enzymatic studies, it was found that all enzymes had a significant difference in the level (p <0.05). The trypsin, chymotrypsin, and amino-peptidase enzymes have been shown to be more prominent in the two active start-ups, and the third and fourth weeks (entering the infant's age and adolescence). The alkaline phosphatase enzyme has a relatively stable trend and increased on the fifth day (mouth opening) and decreased slightly from week 4. Lipase and amylase also have a decrease trend, which is likely to be linked to a high protein diet of the animal. The start of active nutrition was increased, evolutionary characteristics of this fish were somewhat similar to other fish of the carp species, but there were also some differences

Topics: Biology, Fisheries
Year: 2018
OAI identifier: oai:generic.eprints.org:26635/core331
Provided by: Aquatic Commons

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