جستجوی مقالات مرتبط با کلیدواژه « ichthyology » در نشریات گروه « زیست شناسی »

For geometric morphometric comparison of chub, Squalius turcicus,, in Ghezel-Ozan, Kasma, Palangabrud, Talvar, Tonekabon, Chalakrud, Divandareh, Zalkie, Zarinrud, Sefiedrud and Shafarud and Noor rivers of south-western Caspian Sea basin, 243 specimens were captured by a seine nets. After anesthetizing in 1% clove oil solution and fixing in 10% neutralzed formalin, specimens were transferred to the Isfahan University of Technology Ichthyology Museum (IUT-IM) for further studies. To study the variation of body shape based on geometric morphometric methods, 13 landmarks were defined on the two-dimensional images taken from the left side of samples using the TpsDig2 software. After Procrustes analysis (GPA), digitized data were analyzed using multivariate analyses such as principal component analysis (PCA), canonical correlation analysis (CVA) and cluster analysis, also, network deformation changing configuration patterns of population compared to form of the consensus by visualization. Results showed significant differences between the populations studied. The major differences in body shape of the studied populations were related to the head and body depth, and position of the pectoral, anal and dorsal fins. The observed changes are due to adaptation to the habitat, which has been influenced by different habitat conditions and has shown different body shapes.

In this research, histological structures of different parts of kidney (trunk and head kidney) were described in 21fish species from northwest regions of the Persian Gulf. Fishes were anesthetized and then their kidneys with some adjacent vertebral column were collected and fixed in Buin’s solution for histological purposes. Samples were processed according to routin paraffin method sectioned (5 micrometers) and stained (Hematoxylin and Eosin). According to the results, kidneys have two distinct structures including hematopoitic and excretory tissues. Head kidney has more hematopoitic role with nephrons among them. Different types of blood cell such as red blood cell, lymphocytes, monocytes and granolocytes as well as plasmacells, reticular cells and macrophages were observed in head kidney. There were melanomacrophage bodies among hematopoitic tissues in some species. Excretory parts in studied species were included of glomerules and nephric tubules. Neck section, proximal tubule (I and II), distal tubule and collecting tubule were present in nephric tubules. In chondroichthyes such as Grey Bamboo Shark )Chiloscyllium griseum( and stingary )Himantura walga (nephrones have bigger parts in comparison with osteichthyes due to evolutionary aspects

The morphological comparison of five populations of Mosul bleak (Alburnus mossulensis Heckel, 1843) was done using Elliptic Fourier analysis. For this porpose a total of 219 specimens were caught from Tigris basin (Gamasiab, Karoon, Kashkan, Khersan and Sepidbarg Rivers) using electrofishing. The fish were photographed from left sides using a digital camera and the outline curve was digitized using TpsDig2 software and resampled to 150 equal distanced landmarks. The outline curveswere converted to a readable file format for EPA analysis using EFAWIN software and EFA analysis was done opting 17 shape harmonics with 2 constants and four coefficients per harmonic and non-shapeddata were removed usin general Procrustes analysis. The principal component analysis (PCA) and Manova/CVA were used for morphological comparison in PAST software. The results showed significant shape differences between populations but Sepidbarg population (p