Objective: The study was aimed to investigate the macroscopic and the microscopic aspects of the vasa deferentia of Callinectes amnicola (brackishwaters crabs) Methodology and results: Investigations with light and electron microscopes after respectively histological and cytological treatments, allowed following the differentiation of the internal tracts. A macroscopic observation has indicated 7 stages in male sexual maturity. Primary white vasa deferentia of the individuals of the stages II and early stage III are composed of an acellular area surrounded by an epithelium. The epithelial layer infolds centripetally fuses giving secondary ducts at the stage III. The gonoducts in the adults of stages IV to VII are subdivided in anterior vas (AVD), medial vas (MVD) and posterior vas (PVD); each one forms a package of secondary ducts. A secretory phenomenon appears in the ducts at the stage IV, and spermatophores are found among the vesicles of secretion. At the stages V to VII the secondary ducts of the anterior vas deferens (AVD) delineated by a columnar epithelium contain spermatophores in their lumen. The medial vas deferens (MVD) presents some secondary ducts containing pockets of secretion. Other ducts are invaded by spermatophores. In the posterior vas deferens (PVD), ducts contain spermatophores. Physiology of the tract was carried out.

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Brachydeuterus auritus is a fish species with a high level of exploitation potential in Côte d'ivoire. The following study is based upon a maturity ladder and the discrimination of the hepatopancreas. The methodological approach consisted of a macroscopic description of the hepatopancreas according to the five stages of sexual maturity. The microscopic study consisted of fixing the hepatopancreas, dehydrating, impregnating, including it, making cuts that are colored for observation. At the macroscopic level, the hepatopancreas is made of two unequal lobes. The organ has a colouring as well as a vascularization varying in terms of the species development stages. At the microscopic level among the males, the hepatopancreas is a mixed organ made of the liver and the pancreas. The hepatopancreatic parenchyma is an homogeneous tissue made of hematocytes which are polygonal cells. In addition, we can find hematopoietic tissues in the parenchyma and melanomacrophages centers located near the blood vessels and the biliary tracts. The melanomacrophages centers are formed with cells accumulating pigment cells. Inside the organ, the pancreas is discriminated centripally and constituted of exocrine cells and Langerhans islets. The physiology of the two entities (liver and European Scientific Journal August 2017 edition Vol.13, No.24 ISSN: 1857 -7881 (Print) e -ISSN 1857 290 pancreas) will establish the organ's physiology. Hepatopancreas is involved in reproduction, digestion and defence. It exists as an organ that controls many functions and plays an important part in the physiology of fish in anabolism and catabolism.Keywords: Brachydeuterus auritus; male ; hepatopancreas ; anatomy ; histology ResumeBrachydeuterus auritus est une espèce de poisson qui présente un fort potentiel d'exploitation en Côte d'Ivoire. La présente étude porte sur l'échelle de maturité et la différenciation de l'hépatopancréas. La démarche méthodologique a consisté à une description macroscopique de l'hépatopancréas en fonction des cinq stades de maturité sexuelle. L'étude microscopique a consisté à fixer les hépatopancréas, à les déshydrater, à les imprégner, à les inclure, à réaliser les coupes qui seront colorées en vue d'une observation. Au plan macroscopique, l'hépatopancréas est constitué de deux lobes inégaux. L'organe présente une coloration, des granulations et une vascularisation qui varient en fonction des stades de développement de l'espèce. Au plan microscopique, chez le mâle, l'hépatopancréas est un organe mixte constitué du foie et du pancréas. Le parenchyme hépatique est un tissu homogène, formé d'hépatocytes qui sont des cellules polygonales. En outre, on distingue dans le parenchyme des tissus hématopoïétiques et des centres mélanomacrophages, répartis près des vaisseaux sanguins et des voies biliaires. Les centres mélanomacrophages sont constitués de cellules accumulant des pigments. Au sein de l'organe, le pancréas se différencie de façon centripète. Il est constitué de cellules exocrines et des îlots de Langerhans. La ph...

Chloroscombrus chrysurus is a pelagic fish species that belongs to the Carangidae family. It has a fairly high level of exploitation in Côte d'Ivoire. This paper focuses on the study of the maturity scale, the differentiation, and the histology of hepatopancreas. The methodological approach consisted of a macroscopic description of the hepatopancreas according to the six stages of sexual maturity. The microscopic study consisted of fixing the hepatopancreas, dehydrating them, impregnating them, including them, and making the sections that will be stained for optical microscopic observation. Macroscopic analysis has established six stages of sexual maturity in the species during which the growth and differentiation of hepatopancreas occur. From the juvenile to the adult stage, the size and color of the hepatopancreas vary. On the other hand, its aspect and shape remain unchanged. The hepatopancreas consists of two unequal lobes. The left hepatic lobe is always more developed than the right. On the microscopical level, among the female gender, the hepatopancreas is a mixed organ which constituted the hepatic parenchyme and pancreas. The pancreas differs in the hepatic parenchyma which is composed mainly of polygonal hepatocytes and blood vessels. The hepatocytes are arranged in sinusoidal cords around the capillaries. The pancreas is composed of islets of Langerhans (endocrine pancreas) and serous acini Pancreatic (exocrine pancreas). Both structures progressively invade the hepatic parenchyma. The hepatopancreas is an essential organ in the physiology of fish.