فهرست مطالب حمید حسین پور

Ancient schwannoma is one of the rarest subtypes of typical schwannoma, and just two cases of codaequina involvement with this tumor have been reported so far. This type of tumor has large areas without cells (Antony B) and a small part of pericellular areas (Antony A), which in the case of typical schwannoma, it is opposite. The pathological form of this tumor indicates the slow growth of the soft consistency and the benign course of these types of tumors.

Kurdistan province is one of the most important provinces in Iran in terms of surface and underground waters, and the Garan resevior (Marivan) has important rules in aquaculture and fisheries activities. For this purpose, the present study was carried out including a survey of 22 physico-chemical parameters at four sites of Garan reservoir from July 2017 to August 2018. Results showed that the mean value of water temperature 11.13 ± 6.7 °C and the Dissolved Oxygen (DO) concentration was 8.44 and 3.87 mg/l for surface and deep layers respectively. Based on the results, was shown that the Thermocline and oxycline start from June and they vanish in December as well as. Mean of pH value 7.99 and secchi disc depth was high (2.3 m) relatively. Also the mean value of alkalinity, Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and electro conductivity 138.59, 1.32, 25.02, 0.047, 156.91 mg/l and 242.18 (µmhos/cm) respectively. Also mean of nutrients were within desirable limits. In general, although seasonal and spatial variations were observed in some parameters, but according to the results of physico-chemical characteristics, the Garan reservoir could be considering suitable for standard pattern of aquaculture activities.

Fish sampling was conducted to evaluate the species diversity of fish in 4 stations in Sanandaj Azad dam ecosystem seasonally from summer of 2017 to spring of 2018. A total of 1057 fish were caught in 12 species, of which more than 80% were caught in the lake behind the dam. The Cyprinidae family had 11 species with the most species diversity and only Sasanidus kermanshahensis belonged to the Noemachilidae family. There was no significant difference between Shannon species diversity in the lake behind the dam (with a mean of 1.11 ± 0.32) and Komaci River (P> 0.05), and in summer with other seasons there was a significant difference (P <0.05). The size and weight of the population living in the lake habitat behind the dam were significantly higher than the population living in the river habitat (P <0.05). Among the identified fish species, 5 species Carrasius auratus, Cyprinus carpio, Hemiculter leucisculus, Hypophthalmicthys molitrix and Pseudorasbora parva are exotic species. Among the influences of exotic fish is its competition with native fish for food, and this will have a significant impact on the species diversity of the fish, population dynamics and fish populations. Also Sasanidus kermanshahensis is an endemic species for Iran, which is very important for protection. Considering the importance of endemic species and the presence of a considerable number of exotic fish species in the Azad dam ecosystem, the results of this study are of considerable importance.

Determining the relationship between biotic and abiotic factors and their effects on water quality and eutrophication plays important roles in managing and optimizing the efficiency of dams. Therefore, in the present article, the above relations with emphasis on the results of one-way and multivariate statistical analysis were investigated in Sanandaj Azad dam. Monthly Sampling was carried out in 5 stations in 2015-2016. All environmental parameters (Water temp.,Secchi disk, Turbidity, pH, DO, DO%, BOD5, COD, EC, NO3-, PO43-, Chl-a) and microbs (Total counts, Total coliform,  Fecal coliform and   Fecal Streptococcus) were analyzed based on standard methods. (According to the results, low numbers (less than 0.1 CFU / 100 ml),  of streptococcus and fecal coliform in all samples were a good sighn of fine water quality in terms of non-contamination with fecal (resistant and old) and (fresh) microbes. In the step wise linear regression test, the coefficient effect of trophic state, based on chlorophyll-a and transparency depth on the total trophic index was obtained more than the nutrients trophic index. According to the principal component analysis (PCA), the trophic state index and chlorophyll-a concentration (in the first component) were the most important factors on quality of the water. While the water quality index and its parameters (inorganic phosphorus, BOD5 and coliform) were included in the second component. Among the environmental parameters affecting the quality of water, the percentage of saturated dissolved oxygen and then BOD5 were in the first priority. As a conclusion, according to the the trophic state index, this dam is suitable for the development of rough fish (cyprinidae). In other words, according to the WQI index, the Azad Dam is suitable for farming of salmonids fish, but based on trophic stae index, condition is not very favorable.

This survey was carried out on the diversity and structure of zooplankton and fish during to summer 2015 to spring 2016 in the lake of Azad dam in Sanandaj, Iran. The sampling of fish was done by gill net and Electrofishing method was also used for sampling of the Cumasi River with a current of 1.7 amps and 100-300volts. Zooplankton sampling was carried out at 5 stations seasonally by 50 micron plankton net with a diameter of 36 cm. In the present study, 23 species of zooplankton were identified, 20 species belong to the holoplankton and 3 species belong to meroplankton groups. The results showed that the zooplankton population was 3276 ind./m3 in the autumn, which was lower than in other seasons. In winter, the density increased and peaked in the spring.  In all seasons, the rotifera accounted the highest density were of zooplankton was observed. The highest density at stations 5, 4, 2, 3 and 1, respectively. In this study 12 species of fish were identified, 11 species of the Cyprinidae and 1 species of the Nemacheilidae. The Alburnus sellal, Capoeta trutta and Carassius auratus were present in all seasons in dam and rivers. In summer, the density of the fish was 258 specimens, falling in the fall and reaching 47 specimens in the winter. From the spring, a high increasing (448 specimens) was observed in the catch, which 353 specimens belonged to the species Alburnus sellal that contained 79% of the fish caught in this season. Considering that the reservoir volume of the dam is 300 million cubic meters, there are on average about 39 tons of zoplankton in the reservoir, which is available aquatic animals of dam, especially larvae, fingerlings and fish. Considering the state of zooplankton in terms of the amount of food for fish and larvae, the dam can be used for fishery exploitation and proper management.

In order to determine the age and growth of Chub in the Gheshlagh River of Sanandaj, two areas were selected; one in upstream of the river (Naysar; high water quality) and the other in downstream (Soaryan; impaired water quality). A total of 280 fish specimen were caught during four seasons. The overall male to female ratio was 1:1.86 in Naysar and 1:0.61 in Soaryan. Both ratios were significantly different from the expected 1:1 ratio (P<0.01). The age of individuals was from 0+ to 5+ in both areas. The overall length-weight relationships were calculated as negative allometric in Naysar and isometric in Soaryan. The fork length and body weight of fish samples in Soaryan were significantly larger and heavier than those in Naysar in most of age classes and in both sexes. The average asymptotic length was calculated as 28.2 cm for male and 35.5 cm for female based on von Bertalanffy growth equation for all fish samples in Gheshlagh river system. The overall condition factor was estimated as 1.53 and 1.5 for male and female, respectively. In most of age classes, the condition factor was significantly larger in Soaryan fish samples in comparison to Naysar samples. Results showed that some Chub biological parameters were different between two study areas. These differences could be due to the entrance of Sanandaj wastewater into Gheshlagh River in Soaryan area.