دراسة مقارنة لكفاءة الترشيح الغذائي وبعض الصفات المظهرية والنسجية لبعض أجزاء القناة الهضمية المريء والمعدة في نوعين من الأسماك المحلية

Comparative Study of the Efficiency of Food Filtration and Some of Morphological and Histological Characteristics of Digestive Tract Parts for Esophagus and Stomach in Two Kinds of Local Fishes

The present study included a comparative anatomical study of some of the specific criteria for food activity in two different species of fish are differentiated nutrition including: Acanthopagrus latus, Which inhabits saltwater environment and Barbus luteus which inhabits the fresh aquatic environment and belongs to different family. For each type study the food filtration area and the appearance of certain digestive tract and gastrointestinal tract.
The results of the present study showed that some of the results related to the food activity, which include some of the Gill criteria including the Length of gill arch, the number of the gill arch teeth, the thickness of the base of the Gill richer, resulted in different filtration area and filtration space in both types.The values differed significantly at (p> 0.05) When comparing the two types with the note that the moral was in favor of Acanthopagrus latus fish for the food filtration area in While the morale in favor of the fish Barbus luteus for the filtration space in addition to the possession of Barbus luteus five gill arch carrying Gill richer on the sides of the dorsal and abdominal except the fifth arch, which has a single row of gill richer abdominal while the Acanthopagrus latus have four gill arches carrying two rows of gill richer Which had a long conical shape and had a wide base and a thin end in the Acanthopagrus latus while it was short and cylindrical and pointed end and a broad base in the Barbus luteus seems to be in line with the nature of the different feeding in two kind fish.
The results of morphological of the gastrointestinal and esophageal study showed that the Acanthopagrus latus had short esophageal with a tubular structure attached to a closed cyst from one side and open from the other side taking a side position for the gastrointestinal tract and connected to the esophagus from the Front part and the intestine from the end part, as for in the fish Barbus luteus the esophagus is characterized by a longer tubular structure that is associated with a cylindrical stomach that is not distinct from the rest of the gastrointestinal tract.
The results of the histological study showed that the esophageal wall in both types of the study consists of four tunic including, tunica mucus is composed of the simple columnar epithelial tissue followed by the lamina Propriaconsists of loose connective tissue, Muscularis mucosa, which is thin with a large number of mucous cells with the folds that are straight and unbroken and short in Acanthopagrus latus, but in the Barbus luteus appear in the same structure except the epithelial tissue in which the stratified columnar tissue in addition to the lack of differentiation of muscle mucosa, And tunica Sub mucus, tunica Muscularis, which consists of two strands layers of muscle fiberrank longitudinal inside and circleabroad, and then tunica Serosa, which consists of loose connective tissue transfuse capillary blood vessels.
The results of the comparative study of the histology of the esophagus showed that the studied species were different in many of the histological parameter, including (thickness of the mucus layer, thickness of the muscle layer, thickness of the serosa layer), which was significant at (p≥0.05) She was morally oriented towards fishAcanthopagrus latus while back (Length of fold, thickness of the sub-mucus layer, average number of folds) were significant towards the Barbus luteus at the mentioned level.
As for the stomach wall, it emerged that it consists of the same tunica forming the wall of the esophagus in both types of study fish with some of the alterations that included the formation of the epithelial tissue of the tunica mucous of the simple cuboidal epithelial tissue followed by the lamina Propria consisting of loose connective tissue, Note that muscle mucus does not differentiate, with note tubular gastric gland, which produces mucus on the free surface through small holes called gastric pit, along with the folds that are long, slanted and unbroken along, and tunica sub mucus, tunica muscular which consists of two strands of longitudinal, circular, and tunica serosa, which are composed of thick connective tissue with capillary blood vessels.
The results of the comparative study of the tissue histology of the stomach revealed that the studied species differed in many of the histological parameters, including (number of folds, length of folds, thickness of the sub-mucus layer, thickness of the muscle layer), which was significant at (p≥ 0.05) She was morally oriented towards fish Barbus luteuswhile back (Thickness of the mucus layer, thickness of the serosa layer) was significant in the direction of the Acanthopagrus latus at the level mentioned.