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In this study 239 Capoeta capoeta were hunted from Talar River in sub branch of Tajoon from August 2006 till July 2007. 26 morphometric and 7 meristic characteristics were studied in this investigation. Results were analyzed with SPSS 16 software under T-test and PCA. According to the results, the average of changes coefficient of morphometric and meristic characteristics for Capoeta capoeta in male were 18.09 and 11.64 respectively and in female 13.59 and 10.14 respectively. For the morphometric characteristics , 9 factors that accounted for about 79.57 percent of diversity characteristics and from the morphometric characters, 2 factors that accounted for 50.87 percent of variation within genus were separated. Also, there was not observed any significant difference in the morphometric and meristic characteristics between male and female (p 0.05). Studying on the population structure of Capoeta capoeta showed that age of fishes were ranging from 0+ to 3+ years. Intensive correlation was observed between length and weight in male (r2=0.928) and female (r2=0.967). According to the calculated regression coefficient (b) from length and weight relationship and results of determining growth pattern by Pauli methods, the growth pattern in Capoeta capoeta was negative allometric in male and positive allometric in female . Finally , results showed that there were significant difference according to sex in Capoeta capoeta in morphometric factors, while these differences were less in the meristic factors that can be due to environmental factors such as temperature and salinity on the morphometric factors that do not effect on the meristic factors because these factors are under controls of genetical parameters. .

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In this study, 251 Barbus lacerta were caught from Keseliyan river during August 2008 - July 2009. In order to determine morphological diversity of this species, 26 morphometric characteristics and 10 meristic characteristics were investigated. Results were analyzed with SPSS 16 software and by T-test and PCA. According to the results, the average of coefficient changes of morphometric and meristic characteristics in male Barbus lacerta were 21.79 and 5.37 respectively, and in female were 21.22 and 5.60 respectively. Morphometric characteristics were standardized before analyzing for alleviating the errors due to allomotric growth. According to morphometric characteristics, eight accounted for about 67.67% of characteristic diversity, and in the case of morphometric characters, three factors accounted for 64.85% of characteristic diversity within genus were separated. Also, there was observed meaningful difference in only one morphometric character and one meristic character between male and female (p 0.05). According to the results of Principal Components Analysis (PCA), distinctions between genuses was not observed and male and female had high overlapping.

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The present study aimed to investigatethe effects of different levels of temperature and salinity on the body shape of Sophiae toothed carp (Aphanius sophiae) using geometric morphometrics technique. A total of 120 specimenswere reared at four combined treatments with two levels of temperatures(16 and 25°C) and two levels of salinity (0 and 14 ppt)for one month. The left side of the specimens were photographed and 17 landmark-points were defined and digitized on 2D images using the tpsDig2 softwareto extract body shape data in geometric morphometrics technique. The obtained data superimposed using Generalized Procrustes Analysis toremove effects of size, position and orientation. The obtained data were analyzed using PCA, CVA and CA. The resultsrevealed a significant difference betweenthe body shape of treatments exposed to different combination of temperature and salinity (P<0.05). The results showed that changes in the body shape of 16°C and 0 ppttreatmentincludesthe anteroventral shift of the snout, the elongation of the opercle, increasing the depth of the head and eye diameter.At 16°C and f 14ppttreatment, decreasingin the height of opercle was observed. At 25°C and 0 ppt treatment, the height of the operclewas increased, and at 25°C and 14 ppttreatment, the observed changes were relatedto the tip of snout. The results of the present study indicatedthe effect of temperature and salinity on thebody shape of the Sophiae toothed carp.

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According to the results of a research project entitled as: Biodiversity of Inlandwater fish species of Iran which carried out from 2005 to 2010 some specimen of Luciobarbus brachycephalus (Kessler, 1872) and Luciobarbus capito (Güldenstaedt, 1773) obtained from main rivers of south basin of Caspian Ssea using of electrofishing as the main method for sampling. Samples fixed in formalin and transferred to laboratory. Then 24 morphometric and meristic factors, also 11 ratio of these two species were studied. Due to similarity between two species, the systematic differentiations were explained.

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In this study, the stock identification of (Acanthopagrus arabicus) as the dominant species of the genus was carried out by geometric morphometric in the fishing grounds and landing sites of the west and east part of the Hormuz Strait from June 2014 to May 2016.17-point markers (Landmarks) on the left side of the body of A. arabicus were determined and extracted in order to analyzing body shape data. Body shape analysis was showed the most variations on the head and top of the body and significant differences of body shape were proved between west and east of Strait of Hormuz (P<0.05). Landmark positions in the samples of the west Strait of Hormuz were indicated the decrease of body depth, increase of head length, leaning of base, pectoral and ventral fin to upper part of the body, meanwhile it was contrary in the samples of the east. CVA correlation analysis showed a significant difference in body shape in the west and east of the Hormuz Strait (P<0.0001), so the individuals were shown differences and the stocks of this species were separated in the west and east of the Hormuz Strait.