Knowledge of the digestive tract of fishes is a crucial clue to understanding their diet. Information on the digestive tract of P. obscura remains scarce and fragmentary. Therefore, this work aims to improve our knowledge of P. obscura by investigating the structure of its digestive tract in order to better understand its feeding ecology. To this end, the relationship between the length of the intestine and the standard length was determined by the equation: Li=〖aLS〗^b. On the other hand, the morphological and microscopic aspects of the digestive tract were described. The histological study was carried out according to the standard histological method and stained with haematoxylin and eosin. Intestinal growth relative to standard length follows positive allometry. The digestive tract includes an oesophagus, a developed stomach, a cecum and a relatively short intestine. The wall of the digestive tract consists of four distinct tunics. The muscularis is made up of two layers of muscle fibres at the level of the oesophagus. In other parts of the digestive tract, the muscularis consists of one layer of muscle fibres.
Show abstract
Full Text
