شناسه هاي افزوده :
نصراله زاده ساروي، حسن همكارطرح , نادري جلودار، مهدي همكارطرح , فضلي، حسن همكارطرح , افرائي بندپي، محمدعلي همكارطرح , روشن طبري، مژگان همكارطرح , تهامي، فاطمه سادات همكارطرح , مخلوق، آسيه همكارطرح , كيهان ثاني، عليرضا همكارطرح , خداپرست، نوربخش همكارطرح , نصراله تبارآهنگر، عبداله همكارطرح , باقرزاده افروزي، فرامرز همكارطرح , واحدي، فريبا همكارطرح , مكرمي، علي همكارطرح , آذري، عبدالحميد همكارطرح , صفوي، ابراهيم همكارطرح , لالوئي، فرامرز همكارطرح , طهماسبي ليموني، مرتضي همكارطرح , سجادي، اسداله همكارطرح , معافي، علي همكارطرح , احمدنژاد، احد همكارطرح , آميخته، مريم همكارطرح , رضايي، مرضيه همكارطرح , موسوي تاكامي، فاطمه همكارطرح
چكيده انگليسي :
Investigating the production capacity, fishing and fisheries development in Sanandaj Azad dam for developing of fisheries activity
Aquatic reservoirs such as Azad dam (between Sanandaj and Marivan) play an important role in aquaculture and fish production. The aim of this study was to investigate the biological parameters of Sanandaj reservoir to estimate the amount of primary and secondary production, and finally the ability to rear and catch fish and develop fishing. This study was conducted from July 2014 to June 2015, in four seasons at five stations including river districts (stations 4 and 5), transitions (stations 2 and 3) and lakes (station 1). In this study, planktonic communities were studied seasonally accompanied with chlorophyll measurement monthly from June 2014 to June 2015. Phytoplankton was sampled by water bottle from three layers: surface, middle and near-substrate, zooplankton by plankton net and determination of the primary production potential am by measuring chlorophyll content. Average chlorophyll data was recorded was 3.5 ± 0.5 mg. m3, with the highest mean (± standard deviation) of 8.8 ± 1.8 mg.m3 in winter, and the lowest with 0.6 ± 1.0 mg.m3 showed in significant difference. Hence, fish production potential through chlorophyll content was calculated of 218 kg.ha-1with the regards of initial phytoplankton production of 324 g.m3 with 162 g.m3 of dry weight. The composition and diversity of phytoplankton species showed that 54 species were identified belonged to six groups: Bacillariophyta, Chrysophyta, Pyrophyta, Cyanophyta, Chlorophyta and Euglenophyta with 20, 1, 9, 6, 16, and 2 species. The annually average of phytoplankton abundance and biomass also were 13.4 ± 2.0×105 ind.m3 (M± SE) and 7.3 ± 3.7 mg.m3, respectively. Meantime, the zooplankton species composition comprised of 25 species belonged to 3 groups: Copepods, Cladocera and Rotatoria, and the Rotifera which the late the highest species (18 species). The annually average of zooplankton abundance also was recorded 8333 ± 20658 ind.m3. Totally, the findings of this research, based on the nutritional status (trophic index), represent the oligotrophic and oligomesotrphic condition of the reservoir.
Based on the primary production, the phytoplankton production was calculated 324 g.m3 with 162 g.m3 dry weight. According the phytophagous fish such as silver carp rearing, it was estimated 218 kg.ha-1. In the other hand, in another method, based on the amount of chlorophyll a concentration with an annual average of 3.5 mg.m3, the production of phytoplankton was 333 g.m3 with 166 g.m3 dried weight in which the production of phytoplanktivorous fish (silver carp) was estimated of 222 kg. ha-1. In this research, based on Key words: Primary production, catch and Fishing, Sanandaj Azad reservoir, Iran.
energy pyramid from the primary producer to the consumer, it was predicted annually 222 kg of silver carp, 15 kg of big head carp, 6 kg of common carp and 27 kg of native fish production per hectare. Thus, in reservoir water level of 1475 and 1460 m, the reservoir area will be 877 and 600 hectares, the annual fish production will estimated to 237 and 162 tons. Taking into account the minimum and annual fish production of 162 tons, the common annual capacity will be sufficient to 32 fishermen with the net income from fishing and the final exploitation of the reservoir in the fifth year of 6 billion Rials, and the income of each fisherman was predicted 196.2 million Rials per year.
