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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: 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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  • 3
    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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  • 4
    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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  • 5
    Publication Date: 2021-05-19
    Description: The aim of the present study is the environmental impact assessment of tilapia (Tilapia nilotica) farming in suitable areas of Yazd province. This research was conducted to achieve appropriate use of these resource, employment and development of central less developed regions of Iran along with identifying the human and ecological effects of its implementation in order to minimize environmental impacts as well as economic and social justification. Total area of about 100 ha at 6 farms in selective areas include Tabas (central region), Ardakan (Chahafzal), Mheriz (Bahadoran), Bahabad (Central Region),Taft (Chahbeygi-Dehshir) and Khatam (Tanoore-Lahoor) was assessed in order to tilapia farming and aquaculture industry development. So, impact assessment of this project development in environmental and social - economic parts was considered and Matrix method was utilized for the environmental impact assessment. 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 operation phase matrix, 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 ; Area
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 132pp.
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  • 6
    Publication Date: 2021-05-19
    Description: The blue swimming crab Portunus pekagicus linneus, 1758, is Known as a by catch of trawlers, Gillnetting,... in the coastal waters of the Persian Gulf and Oman Sea, Blue crabs are not considered as target catch in the Iranian fisheries. The best method for catching these crabs is in this survey. Two kind of posts including Japanese shrimp pots and collapsible pots were tried. Also gill net was used. Result showed that Japanese shrimp pot and collapsible pots were determined as the best gear, Samples catched by these pots have larger mean lengths and weight, they are mainly undamaged.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Fishing ; Portunus pelagicus ; Shrimp ; Crabs
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 64pp.
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  • 7
    Publication Date: 2021-05-19
    Description: An experiment were conducted to evaluate The effect of feeding frequencies and stocking size on growth and feed conversion ratio (FCR) of rainbow trout (O. mykiss) in brackish water for 102 days. Three stocking sizes (10, 25 and 40 g/fish) of rainbow trout and three feeding frequencies (feeding fish twice, three times and four times per day) were examined as the same time. Fish were fed at a restricted feeding program according to the rainbow trout standard table in the definite times during the light period. The results showed that in the group with 10 g initial weight increasing the feeding frequency, some growth factors like final weight, daily growth, and weight gain. But the other factors such as food conversion rate (FCR) and specific growth rate (SGR) decrease. It means in this group (10 g) two times feeding per day is not enough for an acceptable growth rate. In the two other groups with (initial weight 25 and 40 g) although by increasing the feeding frequency, some growth factors a little increase but these differences in 95% level (p≤0.05) are not significant. Therefore in rainbow trout culture with initial weight at least 25 g two times feeding per day was enough. The results of carcasses analysis of fish, showed that by increasing the feeding frequency there were no significantly difference at 95% level between the body compositions in all of treatments. With connivance of feeding frequencies, the best FCR was in the group with 10 g initial body weight and there was not any significant difference in SGR. So according to the results, it suggests that fish should be stocked with 10 g initial body weight.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Rainbow trout ; Feeding frequency ; Brackish water ; Growth ; FCR ; O.mykiss ; SGR ; Culture ; Body weight ; Conversion rate ; Body compositions ; Size
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 45pp.
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  • 8
    Publication Date: 2021-05-19
    Description: In this study, quality of fresh, slow frozen and quick frozen tilapia (gutted and) fillets and its changes during storage at -18 C were investigated. For preparation the samples, fresh tilapia fillets were frozen by slow and quick frozen methods. Slow frozen samples were prepared by storing the packed fillets directly in the -18 C°. The sprila freezing tunle with -30C° was also used for preparation the quick frozen sample. The quick frozen samples were then stored at -18C for six months. Proximate composition, fatty acid profiles, TBA, PV, TVN, Total cuont, Drip loss, and sensory evaluation of the samples were determined in every month. Scanning Electron Microscopy (SEM) was used for study on the effects of the frozen condition on the microstructure of the fillets. Results indicated that two different frozen methods had significantly different effects on the quality of the samples. Most of the proximate composition (protein, moistre and fat) reduced during the storage. Quick frozen samples had significantly (P〈0.05) lower reduction than slow frozen samples. All of the chemical quality indexes (PV, TBA, and TVN) increased during the storage as compered to the fresh samples. In these paramethers, the slow freezing had higher changes than quick freezing metods (P〈0.05). The microbial properties of the samples showed decrese during the storage. Lower amont of total cuont was observed at the end of the storage time in the quick frozen samples than slow frozen once (P〈0.05). The large changes in the fatty acid profiles of the sample were fond in all samples. During the storage SFA and MUF of the samples increased however, the PUFA decresed. A lower change was obseved in the quick frozen samples than slow frozen samples (P〈0.05). Drip loss was increased in both frozen samples during the storage period. The percentage of the drip in the slow frozen samples was significantly higer than quick frozen samples (P〈0.05). SEM micrographs were also showed that the chnges in the microstructur of the samples was different in the slow and frozen samples. Slow freezing methods had higher damge in the microstructure of the sample then quick freezing mathods. Sensory evaluation of the samples indicated that a better acceptability in the quick frozen samples than slow frozen sample (P〈0.05).
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Nile tilapia ; Red Tilapia ; Quick freezing ; Slow freezing ; Fatty acids ; Scanning Electron Microscope ; SEM ; Nutritional value of fish ; Investigation
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 151pp.
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  • 9
    Publication Date: 2021-05-19
    Description: In recent years, aquatic diseases have damaged aquaculture industry in different areas of the world. Although tilapias are known as resistant fish against different pathogens, but there are some reports about infectious diseases of tilapia. Tilapia aquaculture in Iran is in the beginning stage. So, planning for hygiene observations and preventing of disease prevalence must be considered. Tilapia hatchery and indoor systems of National Research Center of Saline water Aquatics were monitored for infectious disease from October 2012 to February 2014. Unusual locomotion/feeding or uncommon signs in the shape or body surface of cultured tilapias, fries and eggs or exceed mortalities were mentioned for bacterial, fungal, parasitic or viral pathogens. Infectious agents in this study were bacteria Streptococcus and Edwardsiella, the fungi Penicillium and Aspergillus and parasitic monogeneans Gyrodactylus and Dactylogyrus. No viral agent was diagnosed. Although recorded pathogens were rarely observed during the study but much attention must be paid for hygiene monitoring and instruction performance.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Tilapia ; Aquaculture ; Bacteria ; Fungi ; Parasite ; Virus ; Streptococcus ; Edwardsiella ; Penicillium ; Aspergillus ; Gyrodactylus ; Dactylogyrus
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 76pp.
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  • 10
    Publication Date: 2021-05-19
    Description: Various Problems in front of shrimp culture, mainly in biological fields and restrictions of production cycle, emphasized the species diversity in aquaculture industry of Iran in fourth socio- economic development plan of fisheries department. By this means, the Iranian Fisheries Research Organization, defined a Programme with four sub- projects, and started the activities on beginning of 2004. On the year 2004, 80 pairs of SPF/SPR Litopenaeus vannamei broodstocks imported from Hawaii, but late importation and prolonged acclimatization period, caused propogation and PL production on mid-September. Despite of terminated culture season, some PL's stocked in earthen ponds of Helleh site in Bushehr province. Results of this phase showed that, L.vannamei could support the cold winter of about 9 C temperature and about 20000 broodstocks harvested at the next year. At the next year, 55 pairs of SPF/SPR broodstocks imported by the same way, and after production of PL in Bandargah hatchery, the farming carried out in Helleh research earthen ponds. At this year, shrimp farms of Bushehr province infected with WSSV, but L.vannamei growth was very good, and gained more than19g after 90days farming. On the year 2006, the farming pilot project repeated, and the way for extension smoothed. In a parallel action, introduction of L.vannamei to Choebdeh site (Khouzestan province) showed remarkable results after 5 years collapses by WSSV. The results of broodstocking, breeding and farming research projects transferred very soon to shrimp producers, as the production of L.vannamei in Khouzestan and Bushehr provinces raised to 2575tons in the year 2008. In addition the condition for introduction of this species to Golestan province smoothed on 2008, and stocking at rate of 5-6 individuals per m2 in earthen ponds of Gomishan resulted in 20g. Shrimp weight after 75 days culture. This stock used as brood stock for commercial production on 2009 by private sector. It seems that all four southern provinces are going to utilize L.vannamei as the main species in 2009, and domesticated brood stocks.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Biological ; Litopenaeus vannamei ; Introduction ; New species ; Shrimp ; Culture ; Diversity ; Aquaculture ; Broodstocks ; Temperature ; L.vannamei
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 47pp.
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