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  • 1
    Publication Date: 2021-05-19
    Description: Larvae of the chironomid midges (blood worms) are known as use full live food for cultured aquatics. There are endemic blood worms in sediments of the earthponds of Bafgh area at center of Iran. This study tended to identification of two chironomid species, Chironomus aprilinus Meigen, 1830 and Dicrotendipes sudanicus Freeman, 1959 & 1961, from Iran as a new record. Culture of blood worms was successful in glass thanks with 16h. light, at 24-26°C temperature. Eggs were incubated after 14 days. Suitable concentration of harvesting is 1-2 egg masses (1250eggs/m2). Enrichment of earthponds or plastis thanks including sedime is offered for culture of chironomid larvae. Collectors prepared with low cost materials are useful for collection of egg masses. May, June and July are the best time for egg collection. Large blood worms are mainly avalable in winter. Results of body analysis of the larvae indicated high dry matter with good quality.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biotechnic ; Chironomid ; Identification ; Culture ; Collector ; Brackish water ; Chironomidae ; Aquatic ; Larvae ; Blood worm ; Sediments ; Species ; Chironomus aprilinus ; Chironomus aprilinus ; Feed ; Feeding
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 48pp.
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  • 2
    Publication Date: 2021-05-19
    Description: Iran is one of ten disaster countries in terms of water crisis. Also, deficit of agricultural soil is a limiting agent for development of agronomy. Moreover, production of organic crops is very important for health nutrition. Tilapia is an important commercial fish because of its fast growth, tolerance to environmental conditions and diseases, possibility of intensive culture, low costs of production and marketable flavor. Production of aquatic and agricultural crops in an aquaponic system would ask these expectations. Aquaponic system that includes combination of hydroponics and water recycling systems was examined for modulated culture of tilapia and agricultural crops at the present study. Tilapia fries with 6.2g and 5.9g mean weight and stocking density of 40/m^3 were respectively stocked in two 2.5m^3 tanks at September 2013 for 9 months. Fish culture in the two tanks tended to 17.2kg/m^3 and 19kg/m^3 fish production with 658g and 596 mean final weigth, 98% and 100% survival and 1.4 and 1.6 food conversion rate (FCR), respectively. Plants were implanted using grow beds, floating rafts and nutrient film methods. Monthly production of mint, basil, lettuce, cucumber, tomato, pepper were 1.14, 0.5-0.8, 1.32, 2.7-4, 2.03-3.4 and 1.1 kg/m^2 crops, respectively.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Aquaponics ; Greenhouse ; Tilapia ; Crops ; Fish culture ; Hydroponics ; Fish
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 40pp.
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  • 3
    Publication Date: 2021-05-19
    Description: Rainbow trout with initial weight of25g were stocked 24 peace/m of earth ponds with 3000 m area. Each pond was divided into 2 portions with synthetic meshes and 120 days feeding trail was conducted to evaluate effects of aeration system on growth factors of this species. This project included 3 treatments and 6 repeat. Water resource was a semi deep well with salinity of II ppt and temperature of 2400C witch after enter to the earth ponds water temperature was decrease to suitable temperature for rainbow trout (lower than 2000). During the time monthly mean of water temperature was 10.270C-21.1 8QC dissolved oxygen 5.04-10.44 mg/lit and pH 8.03-9.1 L Ponds water salinity was about 11 ppt and had low change because of the low evaporation and exchange of water ponds. Feeding did with dry pellet and fish biomass was determined at fortnightly intervals and daily feed levels adjusted accordingly. At the end of period culture, growth factors (final weight, Daily growth, survival rate, feed conversion ratio and specific growth rate) were determined in model of completely randomized design by ANOVA method. Results showed that aeration in culture of rainbow trout in brackish water earth ponds has no significant effects in exchange of water ponds and growth factors.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Rainbow trout ; Brackish Water ; Earth pond ; Aeration
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 71pp.
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  • 4
    Publication Date: 2021-05-19
    Description: Tilapia is the second cultured fish in the world. Up to 135 countries produces tilapia. Intensive culture systems of tilapia such as cage culture are recently developed because of limitations of water resources. In Iran, studies about tilapia were started in National Research Center of Saline Water Aquatics from November 2008 and some aspects of tilapia aquaculture and culture systems are surveyed. Investigation about cage culture of Nile tilapia, Oreochromis niloticus was performed in two culture periods of 2012 and 2014 in fresh and brackish water conditions of Iran for the first time. Stocking densities of fish in the cages were 25, 50, 75, 100, 125 and 150 fish/m^3 . 100g fish stocked reached 272-331 g during 80 days in the first study. However, 50g fish stocked reached 329-450 g during 145 days in the second study. Results of cage culture of tilapia in fresh and brackish water conditions showed ranges of FCR: 1.56-3.72 and 1.08-1.87, DGR: 1.63-2.91 and 2.14-2.92 g/day, SGR: 0.63-1.12 and 1.29-1.54, production: 5.98-38 and 7.17-41.6 kg/m^3 , respectively. Stocking densities 75-125 fish/ m^3 were appropriate especially in fish reared in brackish water cages.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Tilapia ; Cage ; Culture ; Density ; Oreochromis niloticus ; Nile tilapia ; Agriculture ponds
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 44pp.
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  • 5
    Publication Date: 2021-05-19
    Description: Culture of beluga (Huso huso) in new conditions such as inland brackish water necessitates studying nutritional requirements and effects of different diets on gonadic and somatic growth as well as physiological condition. In this research 74 beluga each 4 years old cultured in brackish water of earthen ponds in Bafgh Fisheries Research Station, were selected and distributed in 8 circular cement ponds. Feeding was done in 4 formulated diets with fixed protein level and 4 energy levels (400, 425, 450, 475kcal/l00g). Samples were biopsied at the start and the end of the experiment to determine sexuality and stage of maturation. To study gonad tissues, the hematoxylin-eosin method was used. Results indicated that somatic and gonadic growth indices were affected by diets. Somatic growth overlapped in both sexes. Sexual maturation stages were not the same in males and females and transition from stage II in males was more rapid than females. Considering the results in this study, diet treatments influenced on somatic growth in both sexes and gonadic growth in females. We conclude that somatic and especially gonadic growth in brackish water is suitable. Therefore, inland brackish water environment can be regarded suitable for beluga cultivation.
    Description: Published
    Keywords: Nutritional requirements ; Inland fisheries ; Ovaries ; Cultured organisms ; Huso huso ; Brackish ; Testes ; Diets ; Growth ; Fish physiology ; Sexual maturity ; Gonads
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.91-104
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  • 6
    Publication Date: 2021-05-19
    Description: The aim of the present study is the environmental impact assessment of tilapia (Tilapia nilotica) farming project in brackish water of Bafgh, with goals to achieve localization of technology and knowledge of tilapia fish production, employment and the possibility to controlled development in other areas. Desired range, located in northwest of Daranjir desert (Inland Salt Water Fishes Research Station, Bafgh). Total area used for the project includes three indoor hall for breeding operation, nursery (juvenile breeding) and fattening. Besides these, three 3000 m 3 available earth ponds has been considered as a potential area breeding after setting apart the quarantine. In order to achieve sustainable development of breeding this fish, impact assessment of this project development in which both environmental and social - economic effects are considered, it seems essential and project will be accomplished more confidently. So, after considering the technical characteristics of the project, the immediate, direct and indirect impact area were determined and environmental aspects of area identified. Matrix methods was utilized for the environmental impact assessment. The most important operational activities, including greenhouse structures implementation and water conveyance facilities, including excavation and embankment, channel, piping, lining of channels and their accessories including inlet and outlet valves, concrete, stone, porcelain, walling up , roof, construction of drainage network and access roads. Based on investigation, accessibility of the region, compatibility with the other land uses, lack of monuments in the area, not covered with the sensitive habitats range, the lack of permanent river flow, low quality of underground water and end up underground water flows in downstream desert and evaporated which result in impossibility of escaping introduced fish from the farm and the use of existing spaces in the first half of the year to product lead to make fewer infrastructure costs and increase revenue, are the main criteria for the sustainable development of this species culture in the area. Considering the executed studies and results of the matrix assessment construction and operation phases, it was concluded that there is no considerable destructive impacts related to the project. Therefore due to the fact that 50% of means in rows and columns of the matrix were not less than -3.1 so, we proposed execution of it with rehabilitation plans. Therefore, some strategies and plans to consider reducing the negative effects and enhance positive effects of the project, including monitoring programs, were proposed.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Environmental impact assessment ; EIA ; Tilapia ; Brackish water ; Tilapia nilotica
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 138pp.
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  • 7
    Publication Date: 2021-05-19
    Description: Taking into consideration culture of beluga (Huso huso) in new condition such as inland brackish water, it is very important to study nutrition requirements and effect of different diets on gonadic and somatic growth as well as physiological condition. In this research 74 beluga (4 years old) cultured in brackish water earth ponds in bafgh fisheries research station, were selected and distributed in 8 circular cement ponds. Feeding was done in 4 formulated diets with fixed protein level and 4 energy levels (400,425,450,475 kcal/100gr). Samples were biopsied in the first and the end of experiment to determine sexuality and stage of maturation. To study gonad tissues, the hematoxylin-eosin method was used. Results indicated that somatic and gonadic growth index was affected by diets. Growth somatic overlapped in both sexes. Sexual maturation stages were not the same in both males and females and transition from stage II in males was more rapid than females. Considering the results in this study, diet treatments influenced on somatic growth in both sexes and gonadic growth in females. It seems to state of somatic and especially gonadic growth in brackish water is suitable. Therefore, inland brackish water environment can be introduced as a suitable environment cultivation of beluga.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Physiological ; Beluga ; Huso Huso ; Brackish Water ; Protein And Energy Requirements ; Gonadic Growth ; Somatic Growth ; Nutrition ; Feeding ; Sample ; Sexuality ; Tissue
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 95pp.
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  • 8
    Publication Date: 2021-05-19
    Description: The production of tilapia fries is a basic requirement for the tilapia culture industry and it is necessary to optimize the production of fries to increase the profitability of the hatcheries. In the present study, the production fries of Nile tilapia, Oreochromis niloticus and hybrid red Oreochromis sp. using tank and hapa systems was investigated. The results showed higher significant difference in the length and weight of fish in the hapa-free tanks, by t-test (p 〈0.05) but much isometric fries and more survival in the hapa system. SRT were similarly 100% in both systems. Also, the means of total length, body weight and survival of hybrid red Tilapia were significantly higher than Nile tilapia fries, by t-test (p 〈0.05). Producing SRT fries in tank system with hapa tended to more isometric fries and appropriate survival, however fries produced in tanks without hapa had higher total length and body weight.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Tilapia ; Fry ; Nursing ; Tank ; Hapa ; Oreochromis niloticus ; Black tilapia ; Sex
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 25pp.
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  • 9
    Publication Date: 2021-05-19
    Description: This survey is part of the investigation on feasibility of introduction of Litopenaeus vannamei Boone, 1931 in shrimp culture industry of Iran. The objective was evaluation of the adaptation of the white leg shrimp, L. vannamei to brackish groundwaters of the Bafgh area in Yazd province. Around 120000 shrimp postlarvae (PL7 and 15) were stocked in four 0.15ha earthen ponds (17 and 23 ind/m super(2)) in July 2005 and the culture period took about four months. Physicochemical and biological factors were studied during the culture. Shrimps were fed with commercial feed of the L. vannamei. Results showed low survival (19.2%) and growth (2-2.5g mean body weight). Based on the assessments, the limnological factors were most unfavorable elements causing the low growth in the shrimp. Concentration of K, Ca, Mg and Na Fe (II and III), different heavy metals, nitrogenous compounds, water hardness and the season and thermal periods are probably the most essential factors affecting production yield of the shrimp because of underground origin of the water. Also, the structure of ponds and drainages, presence of invasive water plants and insects may have affected the survival and growth of the shrimp as well.
    Description: Published
    Keywords: Shrimp culture ; Litopenaeus vannamei ; Brackish ; Growth ; Adaptations ; Survival ; Crustacean larvae
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.133-146
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  • 10
    Publication Date: 2021-05-19
    Description: The study on economic aspects of tilapia culture in Iran is a subproject of a comprehensive project on introduction of tilapia to central regions of the country. Two types of red and black of the exotic tilapia were imported from Indonesia in 2009 for research and were transferred to the research center of Bafgh. Since tilapia has capabilities in aquaculture such as resistance to diseases, fast growth, tolerance to high intensity, growth in freshwater, brackish water and in saline water, also ability to grow in pond, cage and aquaculture tanks, so it is likely that it’s production be of economic advantages. Therefore the present study looked at economic aspects of raising tilapia. The factors examined were feed expenditures, wages, fertilizer spending, costs of fish fingerlings, and pond preparation in two treatments of black and red tilapia in 0.45 hectare earth ponds, 3m2 aquaculture tanks with two replicates. Results of data analyses showed that benefit of each pond for black tilapia would be about 5968763 Rials. For red tilapia this amounted to 5939696 Rials. On total the benefit for black tilapia pond culture was 11940444 Rials while this for red tilapia was 11879392 Rials, so we can conclude that pond culture of tilapia is beneficial. Culture cost of black tilapia in tanks with 57 Kg outcome, was 2540600 Rials. Accordingly the cost of each kilogram of fish is 44572 Rials, so with 20 percent benefit, the price for each kilogram is 53485 Rials. Also for producing 37 kilograms red tilapia in tank some 2531500 Rials was expended. Each kilogram red tilapia cost 68419 Rls to produce which is much more than other cultured fish and if we expect 20 percent benefit the price of each kilogram of red tilapia would be 82103 Rls. So it is concluded that tank fish culture of tilapia would not be beneficial and economically speaking there would be no point to raise tilapia this way.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Red and Black Tilapia ; Economy ; Pond culture ; Tank culture ; Feeding ; Freshwater ; Brackishwater ; Saline water ; Tilapia ; Aquaculture ; Fertilizer ; Fingerlings
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 59pp.
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