The Development of the Digestive Tract in Larval European Catfish (Silurus glanis L.)

Article · May 2008with41 Reads
DOI: 10.1111/j.1439-0264.2007.00812.x · Source: PubMed
Abstract
The European catfish, Silurus glanis L., has become an important aqua cultural fish in Croatia, and it is cultivated extensively in ponds in polyculture with carps. The development of the digestive tract in S. glanis was studied with the aim of improving intensive fish production. Research was carried out on S. glanis larval stadium from 1- to 19-day post-hatching (DPH). The main histological methods used were: haematoxylin and eosin staining, periodic acid Schiff staining (PAS), Alcian blue (AB) and toluidin blue staining (TB). A yolk sac was present during the first 5 days (1-5-DPH). During the initial 3-DPH period, there was no trace PAS and AB activity in the digestive tract. Differentiation of the digestive tract began at 3- to 5-DPH. The oesophagus was positive for AB at 5-DPH, PAS and TB after 7-DPH. Differentiation of enterocytes began at 5-DPG and the intestines were complete at 11-DPH. Development of liver and pancreas was also studied. The analysis of data obtained in this study suggests that after 5-DPH catfish larvae have morphologically completed digestive tracts.
  • ... The weaning period includes administration of live food, followed by formulated diets ( Kozarić et al. 2008;Papadakis et al. 2013). Several studies associate feeding transitions to high larval mortality, since often the food composition and timing of offering are inadequate ( Zaiss et al. 2006;Darias et al. 2007;Kozarić et al. 2008;Shahriari et al. 2014) and not in synchrony with the stage of development of the larva, particularly the digestive system. The transition to different food occurs parallel to morpho-functional changes associated with the development of the digestive tract (initial ontogeny), which is not fully differentiated and there is no activity of digestive enzymes ( Gisbert et al. 2009;Srichanun et al. 2012). ...
  • ... These mucosubstances were intensely reacted with PAS and not to AB. This result indicates the presence of only neutral glycoproteins which might be related to conduction of food, provide efficient protection against proteolysis and mechanical injury (Murray et al., 1994; Domeneghini et al., 1999; Petrinec et al., 2005; Awaad et al., 2014) and had buffering effects on the high concentration acid contents of the stomach (Kozarić et al., 2008). Moreover, it may also involve in digestive activity by digestion and absorbing of easily digested molecules, such as disaccharides and short-chain fatty acids (Grau et al., 1992). ...
  • ... These mucosubstances were intensely reacted with PAS and not to AB. This result indicates the presence of only neutral glycoproteins which might be related to conduction of food, provide efficient protection against proteolysis and mechanical injury (Murray et al., 1994; Domeneghini et al., 1999; Petrinec et al., 2005; Awaad et al., 2014) and had buffering effects on the high concentration acid contents of the stomach (Kozarić et al., 2008). Moreover, it may also involve in digestive activity by digestion and absorbing of easily digested molecules, such as disaccharides and short-chain fatty acids (Grau et al., 1992). ...
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