Abstract
The development of the digestive system in larvae of the Neotropical fish P. argenteus was analyzed histologically. On the 3rd day after hatching, the digestive system comprised oropharyngeal cavity, esophagus and simple undifferentiated tube. Since secreting cells, positive to Alcian Blue (AB), were found in the esophagus, digestive activity in the initial phase had occurred. On the 18 and 28th days after hatching, the esophagus was positive for AB and Periodic Acid Schiff (PAS) stain. The stomach was fully differentiated, with the cardiac, fundic and pyloric regions. Different regions of the epithelium were characterized by basic and acidic secreting cells (AB and PAS positive). On the 18 and 28th days after hatching, the intestine was long, coiled and divided into proximal, middle and distal segments with pyloric ceca. Secreting cells in different regions of the gut were either positive or negative for AB and PAS. Results showed that larvae of P. argenteus exhibited digestive activity on the third day after hatching, with fully differentiated stomach and intestines on the 18 and 28th days and their different regions featuring secreting cells.
Highlights
Fish farms in Brazil have proved to be an important economic activity
Water temperature ranged between 26.0oC and 27.0oC, whilst electrical conductivity, pH, turbidity and dissolved oxygen remained within the comfort range for the species (Table 1), as reported for the genus Prochilodus (Bomfim et al, 2005; Makino et al, 2012)
Ammonium levels were similar to or lower than those observed in a previous study when growth in length and weight was similar to that reported for other larvae of the genus Prochilodus (Santos & Luz, 2009), demonstrating appropriate larval cultivation conditions for P. argenteus
Summary
Fish farms in Brazil have proved to be an important economic activity. Animal Sciences undifferentiated digestive system and by dependence on live feed at the start of exogenous feeding to assist in the digestion process (Micale, Garaffo, Genovese, Spedicato, & Muglia, 2006). The alimentary canal of fish larvae is morphologically and physiologically less developed than that of adults (Govoni, Boehlert, & Watanabe, 1986). Diets based on living organisms or inert feed are generally used on fish farms and depend on the stage of maturation of the digestive system of the Maringá, v. According to Papadakis et al (2009), the rate of maturation and function of the digestive system is linked to the different types of food provided. Since the diet offered is not fully digested due to the nonproduction of enzymes by the digestive system (Chen, Qin, Kumar, Hutchinson, & Clarke, 2006; Moura et al, 2012), the success of different diets used in hatcheries is directly related to organogenesis (Önal, Langdon, & Çelik, 2008)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
