kamran aghili

This project carried out between Augest in 2017 and October in 2018 in the Golestan Dam. A questionnaire was prepared from the household of 4 villages: Gharajeh, Arab Sorang, Agh Abad and Sarjeh Kor. Statistical Methods of Krumbachchr('39')s alpha were used to analyze the questionnaires. The most commonly used scale in social research is the Likert comparison were used to test the validity of the questions. Topsis method was used to investigate the power of effective factors and prioritize it. The Logit model was used to identify descriptive variables and their relationship with event occurrence and eventually an estimate of the probability of occurrence of an event for a particular person. Chi-square test was used to study the effect of gender and age on social and economic parameters. The results of model estimation using the Logit method showed that age, gender and interval variables at each level of 10%, employment at the level of 5%, and migration at the level of one percent, affect the willingness of the people. The results of weighting the criteria using the entropy method indicate that the criteria for improving the economic situation, increasing income in rural communities of the region, employment related to aquaculture, improving the lives of villagers, and increasing aquaculture employment are one of the most important social impacts of this activity. The results of this study showed that fish farming in cages of Golestan Dam can directly affect employment creation, improve economic situation in the region, tourism and reduce rural migration to cities. On the other hand, protein production can have a significant impact on the per capita consumption and nutritional health of residents.

Water quality index is a tool that integrates data of effective factors on water quality. The final result of the index provides simple understanding of water quality for general people. Regarding the importance and application of water quality index in decision making of active and executive units in conservation and exploitation, the present study was conducted for the first time in the southern of Caspian Sea. The aims of paper are to determine: the environmental parameters which are important in water quality, determining weight (wi) of parameters affecting water quality index and sub-indices (qi) of each important parameters of Caspian Sea water quality index (WQIcs). This research will provide the specific and necessary information and data for calculating the water quality index in this aquatic ecosystem. The provided wi and qi were applied for water quality index calculating of the Caspian Sea data in 2018-2019. Using Principal Component Analysis results on long-term data 2003-2019 years (920 water samples), 9 important parameters (turbidity, chlorophyll-a, BOD5, COD, pH, DO%, NO3, NH4 and PO4) were determined for WQIcs and indicator weighting (wi) of each parameter was determined. The sub-index (qi) of each parameter was calculated based on standards threshold, coastal water quality requirements in marine ecosystems and reference value data of Caspian Sea. Finally, by calculating the geometric mean, the value of water quality index in the Caspian coastal waters was obtained. The application of this formula in 2018-2019 showed that 74 and 26% of WQIcs were in the range of 70-91 (medium class) and 35-69 (bad class), respectively. Among the 9 parameters mentioned above, nitrate and phosphorus (the factors of trophic enrichment) had the greatest effect on decreasing water quality index.

This study was carried out in Shahid Marjani Farm to identify the occurrence of helminth parasites in digestive tract of Iranian Sturgeon (Acipenser persicus) in 2016 and 2017. In 2016, 2 Species of Skrjabinopsolus semiarmatus and Cuculanus sphaerosephalus from 11 specimens (mean total length and weight of 160.54 ± 8.6 cm and 31.62 ± 6.72 kg, respectively) and in 2017 just one species (C. sphaerosephalus from 12 specimens (mean total length and weight of 158.3 ± 1.1 cm and 29.3 ± 4.9 kg, respectively) were collected. Incidence in 11 samples were 72% and mean intensity was 6 ± 2.87 for C. sphaerosephalus and incident was 27% , and mean intensity was 3.17 ± 3.25 for S. semiarmatus in 2016. In 12 samples incidence was 50%, and mean intensity was 6 ± 2.87 for C. sphaerosephalus in 2017. results showed the highest rate of incidence was belonged to C. sphaerosephalus. The number and type of gastrointestinal parasites in Iranian sturgeon compared to previous years decreased in southeast of the Caspian Sea that can be the result of changing diet and reducing the host interface.

Present study carried out between 20 Apr. and 22 Feb. 2016 in 19 sampling sites in order to investigate the productivity, and natural dominant living conditions With emphasis on macrobenthoses in the Gorgan Bay. According to the provided maps from the shoreline, depth, and sediment, the total area and volume of Gorgan Bay is 466 square meters and 905.33 million cubic meters respectively. As a result, the study of Gorgan Bay infested communities (macrobenthes) was identified as the 3 phyla (Annelidae, Mollusca and Arthropoda) and 6 classes (Crustacea, Insecta, Bivalvia, Oligochaeta, Gastropoda and Polychaeta) and 12 orders and 12 families. , The Annelidae phylum had the maximum, minimum and mean biomass of 2.35 in April, 0.01 in February and 0.69±.63 gr/m2 , respectively. The Arthropoda phyla had maximum, minimum and mean biomass of 0.07 In March, March 23rd, April 23rd and 2.11±1.24 gr/ m2 , the Mollusca phylahad a maximum, minimum and average biomass of 31.62 in December, 14.10 in June and 22.81±6.09 gr/m2 Was determined. The most abundance was 130 kg/ha in july.and the most Production capacity was 3.59 kg/ha.

This study was conducted to assess the state of trophy, production capability, and identify the natural conditions at 19 stations of Gorgan Bay, between March 2015 and Febreuary 2016. According to the prepared maps of depths and bed, the current level and volume of Gorgan Bay were 466 km2 and 905.33 million m3 , respectively. To determine the trophy's condition, total phosphate and inorganic nitrogen were measured. The range of total phsphate changes varies from at least 37 in March to a maximum of 65 in April with the annual average of 53. The mean value of inorganic nitrogen was 16 µM. The trophic state based on the mean of total phosphate and inorganic nitrogen determined at Eutrophic and meso-eutrophic classes respectively. Therefore controlling and magement program of basin area is nessesary to increase shifting time of mesotrophic to eutroph/ hypertrophic condition of the Gorgan bay.