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Twenty five individuals of Javelin grunter, Pomadasys kaakan, collected from Abadan (29° N and 48° E) and Bandar Abbas (27° N and 56° E) stations along the Persian Gulf, was analyzed for relationship between two populations of this species, using Amplified Fragment Length Polymorphism (AFLP). A total of 410 putative loci were detected by six primer combinations, 88 of which were polymorphic (21.46%). The proportion of polymorphic loci in the Abadan and Bandar Abbas stations was calculated 88.64 and 68.18%, respectively. Average of heterozygosity in the Abadan (0.330) was higher than Bandar Abbas (0.222), which may be correlated with the environmental and ecological conditions of these stations. Nei’s genetic distance for the two populations was estimated 0.112. The phylogenetic tree revealed a clear distinction line between the two populations, supporting that dispersal of eggs and larvae in the Persian Gulf is spatially restricted. Pattern of isolation by distance was observed in this species, indicating that the gene pool of P. kaakan in the Persian Gulf was not homogeneous. The results also showed that AFLP is a potent technique for genetic fingerprinting and species identification.

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Aims: Histopathological study is one of the most appropriate ways to evaluate the effects of contaminants in aquatic organisms. The aim of this study was to evaluate the histopathological changes and histopathological alternation index (HAI) in liver tissue of Pomadasys kaakan and Lutjanus johnii in the Oman Sea.
Materials & Methods: In this study, 18 number Pomadasys kaakan and Lutjanus johnii were captured from there stations Ramin, Konarak and Haft Tir by gillnet in winter 2016. In order to study the type and severity of tissue lesions, liver tissue of both fish species were performed fixation stages in Bowen's solution, tissue processing in tissue processing device, paraffin impression, tissue sections 4-5 microns thickness with microtome, stained with hematoxylin and eosin.
Findings: Tissue lesions observed in fish livers included hepatocyte vacuolization, enlargement of sinusoid, adipose cell accumulation, blood congestion, nuclear pyknosis, hemorrhage and necrosis. Tissue lesions observed in the liver of both fish species were higher in Haft-Tir station and lower in Ramin station than in other stations. Histopathological alternation index in liver tissue of both fish species were higher in Haft-tire station than in the other two stations.
Conclusion: Due to the high traffic of the Haf-Tir dock and its close proximity to other docks in the area, the accumulation of pollutants at this station is more and to cause more severe tissue lesions in fish.