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  • 1
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    Investigation of Litopenaeus vannamei culture in brackish waters of Bafgh, Yazd Province (2021)
    In:  http://aquaticcommons.org/id/eprint/23757 | 18721 | 2018-07-25 07:04:05 | 23757 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    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 ^(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.
    Keywords: Aquaculture ; Litopenaeus vannamei ; culture ; Bafgh ; Yazd Province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 133-146
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  • 2
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    Study of beluga (Huso huso) farming in brackish water earth pond (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25110 | 18721 | 2018-08-23 05:55:27 | 25110 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This research was conducted for evaluation of adaptation and growth rate of beluga (Huso huso) in brackish water earth pond in Yazd Province. In order to select the best density for beluga culture in brackish water earth pond, beluga with initial average weight of 21g were stocked 0.4 and 0.8 peace/m2 of earth pond with 1000 m^2 in area. Water resource was a semi deep well with initial temperature and salinity of 24 and 11.5 g/l respectively. During the time of culture, water temperature, pH, DO and salinity were 12-27, 8.1-9.4, 4.5-8.9 mg/l and 11.5-13 g/l in respectively. Culture period was 240 days. Results showed that growth performance of fishes in studied treatments had no significant difference.
    Keywords: Aquaculture ; Iran ; Beluga ; Huso huso ; Earth pond ; Brackish water ; Evaluation
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 65
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  • 3
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    Study on nutrition requirements and effect of different diets on gonadic and somatic growth of beluga (Huso huso) in new condition such as inland brackish water (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25146 | 18721 | 2018-08-26 17:06:15 | 25146 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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.
    Keywords: Aquaculture ; Iran ; Beluga ; Huso Huso ; Brackish Water ; Protein And Energy Requirements ; Gonadic Growth ; Somatic Growth ; Nutrition ; Feeding ; Sample ; Sexuality ; Tissue
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 95
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  • 4
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    Biotechnics of live feed (Chironomidae) culture for using in feeding of cultured aquatics (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25171 | 18721 | 2018-09-03 17:06:33 | 25171 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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 earth ponds or plastic 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 available in winter. Results of body analysis of the larvae indicated high dry matter with good quality.
    Keywords: Aquaculture ; Iran ; Bafgh area ; Chironomid ; Identification ; Culture ; Collector ; Brackish water ; Chironomidae ; Aquatic ; Larvae ; Blood worm ; Sediments ; Species ; Chironomus aprilinus ; Chironomus aprilinus ; Feed ; Feeding
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 48
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  • 5
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    Study on economic aspects of tilapia culture in Iran (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25410 | 18721 | 2018-09-23 15:53:02 | 25410 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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, 3m^2 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.
    Keywords: Aquaculture ; Iran ; Bafgh ; Red and Black Tilapia ; Economy ; Pond culture ; Tank culture ; Feeding ; Freshwater ; Brackishwater ; Saline water ; Tilapia ; Aquaculture ; Fertilizer ; Fingerlings
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 59
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  • 6
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    An investigation on possibility of nile tilapia (Oreochromis niloticus) feminization under the condition of brackish water in Bafgh (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25574 | 18721 | 2018-10-06 12:10:40 | 25574 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This study was aimed to investigate the effect of different doses of oral diethylstilbestrol (DES) on feminization of Nile tilapia (Oreochromis niloticus) larvae under the condition of brackish water in Bafgh fisheries research center. This Experiment was comprised of two control groups in two replicates and two experimental ones in three replicates. At the beginning of the trial, a number of 2150 larvae were randomly distributed among 10 replicates that were under treatment for 45 days. The diets in two control groups, i.e. non-treated, C1, and ethanol treated feed, C2, and the ones in two experimental groups, i.e. 200 and 400 mg DES/k of feed, E1 and E2, were administrated to 7 day post fertilization (dpf) larvae for a period of 35 days and then until day 45, the larvae were fed with ordinary feed. At the end of the trial, the gender ratio of larvae in different groups was determined by squash test in 50 randomly selected individuals from each replicate. The results showed no significant differences for gender ratios within control groups (respective male to female ratio in C1 and C2 was 47:53 and 57:43). However, the corresponding ratios within experimental ones, fed with 200 and 400 mg DES/k of feed respectively, was significantly different (P〈0.05). Noteworthy that the percent of females between two experimental groups (E1 and E2) was not significantly different (70.0 and 64.7 respectively) but it was significantly different with ratios in experimental groups (P〈0.05). The total body length and live body weight were determined at the begging and then at day 30 and 45, it was randomly measured in 20 larvae from each replicate. At the beginning of the experiment, the mean body weight and total length of larvae was 0.012 gram and 1.03 centimeter respectively. The respective averages at day 30 and 45 were significantly different among groups (P〈0.05). Survival rate was significantly different among groups (P〈0.05), being highest in E1 and E2 respectively whereas lowest in control ones (56.51 and 58.84 in C1 and C2 respectively).
    Keywords: Aquaculture ; Iran ; Bafgh ; Nile tilapia ; Feminization ; Diethylstilbestrol ; Brackish Water ; Oreochromis niloticus ; Fisheries ; Fertilization ; Larvae ; Females ; Survival rate
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 34
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  • 7
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    Effects of different dietary energy levels on growth performance and sexual gonads development of Beluga (Huso huso) reared in brackish water (2021)
    In:  http://aquaticcommons.org/id/eprint/23787 | 18721 | 2018-07-27 13:59:35 | 23787 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    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.
    Keywords: Aquaculture ; Biology ; Huso huso ; Brackish water ; Energy ; Growth ; Yazd province ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 91-104
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  • 8
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    Utility improvement of brackish water cultural earth ponds of rainbow trout (Oncorhynchus mykiss) through establishing enclosure medium (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25299 | 18721 | 2018-09-07 08:25:10 | 25299 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Considering increase in production of earth ponds in brackish water condition, this research carried out at Bafgh fisheries research station to improve efficiency and production of brackish water cultural earth ponds of rainbow trout (Oncorhynchus mykiss). This study was performed in four 0.5ha earth ponds in two treatments with two replications. Each treatment included two earth ponds so that fish farmed in two culture mediums consisting open medium and %20 enclosure medium of pond (pen medium).for this purpose 20% of earth pond s space separated via a fixed net wall with 15mm in mesh. In this research some main growth equations and economical factors were studied. Data were analyzed using SPSS software, Pierson, Toki, Dankan, Dant analysis and also descriptive statistics. The significant differences were determined in %5 level. Since there was a connection between pen medium with free one, no signs based upon disturbance observed in measured environmental factors in this space. Statistical results indicated a significant increase in %WG, %FE, % SGR, %CF and final biomass in pen medium treatment(p〉0.05). According to economic results, this treatment also differed significantly from open medium treatment about ratio of marketable size production and net income so that yield quantity and production income increased. Therefore, through pen culture in 0.5 ha earth ponds and likely larger ones, utility and production of farm improve and can be a good approach for farmers in order to better exploitation of possibilities and facilities.
    Keywords: Aquaculture ; Iran ; Bafgh ; Surrounding medium ; Earth pond ; Rainbow trout ; Utility ; Brackish water ; Culture ; Oncorhynchus mykiss ; Growth ; Yield
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 35
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  • 9
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    Pathogen monitoring in indoor systems of tilapia aquaculture in Bafq, Iran (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25663 | 18721 | 2018-10-08 08:32:27 | 25663 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    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.
    Keywords: Aquaculture ; Iran ; Bafq ; Tilapia ; Aquaculture ; Bacteria ; Fungi ; Parasite ; Virus ; Streptococcus ; Edwardsiella ; Penicillium ; Aspergillus ; Gyrodactylus ; Dactylogyrus
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 76
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  • 10
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    Optimization of breeding (salinity, light regime, brood density and sex ratio) of cultured tilapia under brackish water of Bafgh, Iran (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25681 | 18721 | 2018-10-08 09:07:22 | 25681 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Tilapia is one of the most important cultured fish in the world. World production of tilapia is highly increased in recent decades. Tilapias can live in different aquatic ecosystems due to their reproductive strategies. On the other hand, the gap between seed supplies and farmers' demand is one of the most serious limitations for tilapia culturists. Notice about different effective agents on tilapia reproduction aspects might be useful for increasing of production and better management of tilapia hatcheries. Studies about tilapia were started in Iran from November 2008 for the first time. Some reproductive normative of cultured tilapia in brackishwater were defined. In the present study, sex ratio, stocking density, photoperiod, water salinity and replacement period of female brooders of the Nile tilapia, Oreochromis niloticus were investigated. Studied reproduction indices showed sex ratio 1:1 (F:M), stocking density 5/m3, photoperiod 12:12 (L:D), 8ppm water salinity and 10 days replacement of brooders were suitable.
    Keywords: Aquaculture ; Iran ; Bafgh ; Tilapia ; Oreochromis niloticus ; Breeding ; Sex ratio ; Stocking density ; Photoperiod ; Replacement ; Water salinity ; Brackish water
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 38
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