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  • 1
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    Determination of the best stocking density for rearing Huso huso (2018)
    Details
    Publication Date: 2021-05-19
    Description: Effects of stocking density on growth, food conversion ratio, specific growth rate, percentage of body weight increase in Huso huso were studied in two phases. Juveniles below one year old with an average weight of 92.09±1.72 grams and stocking densities of 1.6, 2.8 and 4 kg/m2 in 3 replicates for 100 days were reared as the phase one group. One year old Huso huso with an average weight of 918.13±21.87 grams and stocking densities of 1.5, 2.5, 3.5 and 4.5 kg/m2 reared for 120 days in 2000 liter fiberglass tanks were the second phase. Results revealed negative impact of density on growth, percentage of body weight, and specific growth rate and food conversion ratio in both phases. In the first phase, lower stocking density (1.6 kg/m2) showed significant increase in growth rate (P〈0.05) as compared to 2.8 and 4 kg/m2 stocking densities resulting in 42.3% and 61 % growth rate respectively. Fish kept at 4 kg/m2 density showed malformed caudal fins and injured body due to higher tensions and contacts. In the second phase, the growth rate of fish decreased with increase in stocking density where fish with lower density (1.5 kg/m2) showed 7.2%, 15.6%, and 19.8% higher weight gain as compared to fish reared at 2.5, 3.5 and 4 kg/m2 stocking density. Analyses showed that with increase in stocking density, feeding area per fish decreases and tension between fish increases that leads to lower feeding efficiency. Based on the results, the recommended optimum stocking density for Huso huso individuals up to 90 grams is 1.5-2 kg/m2 and for fish individuals over 900 grams each the density should be kept at 2.5-3 kg/m2.
    Description: Published
    Keywords: Husu huso ; Food Conversion Ratio ; Fish ; Stocking Density ; Growth ; Feeding
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.129-138
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  • 2
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    Impacts of aquaculture on coastal ecosystem in Hormozgan province (Tiab and Sayeh Khosh areas) (2018)
    Details
    Publication Date: 2021-05-19
    Description: The effects of shrimp culture on the adjacent water bodies over a crop cycle period were evaluated in the year 2005 by studying the water quality of inlet and outlet in two locations within Sayeh Khosh and Tiab area. A one way ANOVA was used for statistical analysis of the data comprising homogeneous subsets and multiple comparisons. We evaluated the variation of 10 parameters including temperature, pH, salinity, dissolved oxygen, BOD5, total ammonia, nitrate, inorganic phosphorous, chlorophyll a, and total suspended solids (TSS).The variations were in the range 21P37.4°C for temperature, 8.12-8.36 for pH, 38-48ppt for salinity, 5.6-7.8mg11 for dissolved oxygen, 0.2ing5.7mgi1 for BOD5, 0.002-0.045mgil for total ammonia, 0.026s.0.275imill for nitrate, 0.001m0.042mgi1 for inorganic phosphorous, 0.11415n/1 for chlorophylls and 33474.2n/I for total suspended solids. The result of this study showed that salinity, BOD5, nitrate, total ammonium, inorganic phosphorous and total suspended solids in the outlet effluents and the receiving water in Tiab (stations 1,2) and Sayeh Khosh (stations 5,6) were higher than other sites (3, 4, 7 and 8) and statistical analysis of variance showed a significant difference between the sites (P〈0.05). The concentration of chlorophylls showed a decrease in the outlet effluents and receiving waters in Tiab and Sayeh Khosh areas.
    Description: Published
    Keywords: Chlorophylls ; Effluents ; Penaeidae ; Aquaculture effluents ; Pollution effects ; Phosphorus compounds ; Pollution ; Ammonium compounds ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.23-34
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  • 3
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    Determination of heavy metal (lead and cadmium) concentrations in liver and muscle tissue of Indian mackerel (Rastrelliiger Kanagurta) in Persian Gulf (2017)
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to compare heavy metal concentrations including lead and cadmium in liver and muscle tissues of Indian mackerel (Rastrelliiger Kanagurta) in Bandar Lengeh, Hormoz island, Hengam island and Kolahi regions. In current research, the influence of season, sex and size (length and weight) on Pb and Cd concentrations in Indian mackerel was investigated in these areas. Then Lead and cadmium concentrations in muscle tissues were compared with international standards for human consumption. Sampling was performed in summer and winter. Metal concentrations of organs were assessed by dry digestion method and atomic absorption spectrometer (AAS). Results showed that there are statistically significant differences between concentrations of lead and cadmium in liver and tissues of the fish in these regions (Bandar Lengeh, Hormoz, Hengam and Kolahi) (p〈0.05), also concentrations of lead and cadmium have significant differences in summer and winter (p〈0.05). The comparison of results of heavy metal concentrations with international standards including NHMRC, MAFF and WHO demonstrated that the amount of lead and cadmium is lower than allowable limits and doesn't have any problem for human consumption. Concentrations of Pb and Cd in both sexes of Indian mackerel have no significant differences (p〉0.05). In addition, there is no correlation between lead and cadmium concentrations in muscle and liver of Indian mackerel with size (length and weight) (p〉0.05).
    Description: Published
    Keywords: Rastrelliiger Kanagurta ; Indian mackerel ; Determination ; Heavy metals ; Lead ; Cadmium ; Liver ; Muscle ; Tissues ; Fish ; Length ; Weight
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.115-124
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  • 4
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    Effects of dietary Betaine on growth, survival, body composition and resistance of fry rainbow trout (Oncorhynchus mykiss) under environmental stress (2017)
    Details
    Publication Date: 2021-05-19
    Description: A four-week trial was conducted to evaluate the effects of different levels of dietary Betaine on growth, survival and resistance to salinity (35ppt), temperature (24 C), hypoxia and high and low pH stresses in rainbow trout (Oncorhynchus mykiss). Four levels of Betaine as 0 (control), 0.4% (B0.4), 0.8% (B0.8) and 1.2% (B1.2) were used with three replicates. Forty fish (0.67±0.15g) were stocked in each replicate and fed at 4-4.5% of body weight, five times daily. Results showed that there were significant differences in growth, survival, NPU, PER and FCR between B0.4, B1.2 and control diet (P〈0.05). Carcass analysis showed that there was higher protein in the carcass of fish fed with diet B0.4 compared to control and B1.2 diet. There were no significant differences in carcass protein content between B0.4 and B0.8. Also, no significant differences were found in carcass crude fat, ash and dry matter among different treatments (P〉0.05). Resistances to high and low pH (10.8 & 3.8) and to high temperature (24 C) were significantly better in fish fed with Betaine containing diets compared to the control diet. Resistance to high salinity in B0.4 was significantly better than the control diet and resistance to hypoxia in diet B0.8 was significantly better than the control (P〈0.05). The results showed that dietary supplementation of Betaine (0.4%) have positive effects on growth factors, survival, body composition and resistance to environmental stresses in rainbow trout
    Description: Published
    Keywords: Oncorhynchus mykiss ; Rainbow trout ; Dietary ; Betaine ; Growth ; Survival ; Body composition ; Resistance ; Environmental stress ; Immunity system ; Feeding ; Diets
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.135-146
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  • 5
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    Influence of replacing fish meal with soybean meal on growth rate, feed conversion ratio and chemical composition of carcass, fillet and liver in juvenile stellate sturgeon (Acipenser stellatus) (2017)
    Details
    Publication Date: 2021-05-19
    Description: This study was conducted to determine the effect of replacing fish meal with soybean meal on growth rate, feed conversion ratio and chemical composition of carcass, fillet and liver in juvenile stellate sturgeon (Acipenser stellatus). As in Treatments one (F), two (S1), three (S2), four (S3) and five (S4) 0, 10, 20, 30 and 40 percent of fish meal was replaced with soybean meal, respectively. Five isonitrogenous and isocaloric diets formulated containing 44 percent crude proteins and 4374 Kcal gross energy kg-1 diet. Individual body weights of fish were measured every three week. Fish were sampled randomly from each treatment for whole body, fillet and liver proximate analysis. Based on the results, weight gain (WG) and feed conversion ratio (FCR) had significant difference among the treatments (P〈0.05), as S3 and S4 diets had significantly weakest performance than any of other diets (P〈0.05). FCR in fish fed on F and S1 diets were significantly higher than fish fed on other diets, while statistical significant differences were observed between S2 with two other treatments. Significant differences were found in carcass protein, lipid, and moisture content in fish fed on diets with different soybean meal levels (P〈 0.05), but ash content have not significant difference among the diets (P〉0.05). Significant differences were found in fillet lipid content (P〈0.05), but protein, moisture and ash content did not significant difference (P〉0.05). Liver proximate composition of fish did not significant difference (P〉0.05).
    Description: Published
    Keywords: Acipenseridae ; Stellate sturgeon ; Nutrition ; Aquaculture ; Fish meal ; Growth ; Feed ; Chemical ; Composition ; Liver ; Fillets ; Juvenile
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.25-34
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  • 6
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    Determination of the best stocking density for rearing Huso huso (2018)
    Details
    Publication Date: 2021-05-19
    Description: Effects of stocking density on growth, food conversion ratio, specific growth rate, percentage of body weight increase in Huso huso were studied in two phases. Juveniles below one year old with an average weight of 92.09±1.72 grams and stocking densities of 1.6, 2.8 and 4 kg/m2 in 3 replicates for 100 days were reared as the phase one group. One year old Huso huso with an average weight of 918.13±21.87 grams and stocking densities of 1.5, 2.5, 3.5 and 4.5 kg/m2 reared for 120 days in 2000 liter fiberglass tanks were the second phase. Results revealed negative impact of density on growth, percentage of body weight, and specific growth rate and food conversion ratio in both phases. In the first phase, lower stocking density (1.6 kg/m2 ) showed significant increase in growth rate (P〈0.05) as compared to 2.8 and 4 kg/m stocking densities resulting in 42.3% and 61 % growth rate respectively. Fish kept at 4 kg/m density showed malformed caudal fins and injured body due to higher tensions and contacts. In the second phase, the growth rate of fish decreased with increase in stocking density where fish with lower density (1.5 kg/m2) showed 7.2%, 15.6%, and 19.8% higher weight gain as compared to fish reared at 2.5, 3.5 and 4 kg/m2 stocking density. Analyses showed that with increase in stocking density, feeding area per fish decreases and tension between fish increases that leads to lower feeding efficiency. Based on the results, the recommended optimum stocking density for Huso huso individuals up to 90 grams is 1.5-2 kg/m2 and for fish individuals over 900 grams each the density should be kept at 2.5-3 kg/m 2.
    Description: Published
    Keywords: Husu huso ; Stocking Density ; Food Conversion Ratio ; Growth ; Rearing ; Weight
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.129-138
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  • 7
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    Impacts of aquaculture on coastal ecosystem in Hormozgan Province (Tiab and Sayeh Khosh areas) (2021)
    In:  http://aquaticcommons.org/id/eprint/23728 | 18721 | 2018-07-20 18:17:57 | 23728 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: The effects of shrimp culture on the adjacent water bodies over a crop cycle period were evaluated in the year 2005 by studying the water quality of inlet and outlet in two locations within Sayeh Khosh and Tiab area. A one way ANOVA was used for statistical analysis of the data comprising homogeneous subsets and multiple comparisons. We evaluated the variation of 10 parameters including temperature, pH, salinity, dissolved oxygen, BOD5, total ammonia, nitrate, inorganic phosphorous, chlorophyll a, and total suspended solids (TSS).The variations were in the range 21-37.4°C for temperature, 8.12-8.36 for pH, 38-48 ppt for salinity, 5.6-7.8mg/L for dissolved oxygen, 0.2±5.7mg/L for BOD5, 0.002-0.045mg/l for total ammonia, 0.026±0.275mg/L for nitrate, 0.001m0.042mg/L for inorganic phosphorous, 0.11415 n/1 for chlorophylls and 33474.2 n/I for total suspended solids. The result of this study showed that salinity, BOD5, nitrate, total ammonium, inorganic phosphorous and total suspended solids in the outlet effluents and the receiving water in Tiab (stations 1,2) and Sayeh Khosh (stations 5,6) were higher than other sites (3, 4, 7 and 8) and statistical analysis of variance showed a significant difference between the sites (P〈0.05). The concentration of chlorophylls showed a decrease in the outlet effluents and receiving waters in Tiab and Sayeh Khosh areas.
    Keywords: Aquaculture ; Aquaculture effluents ; Pollution effects ; Phosphorus compounds ; Pollution ; Ammonium compounds ; Marine ; Chlorophylls ; Effluents ; Penaeidae ; Hormozgan province ; ISW ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 23-34
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  • 8
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    Effect of nanosilver particles on hatchability of rainbow trout (Oncorhynchus mykiss) egg and survival of the produced larvae (2021)
    In:  http://aquaticcommons.org/id/eprint/22411 | 18721 | 2018-04-05 22:27:47 | 22411 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: Effect of nanosilver particles was studied on the hatchability of rainbow trout (Oncorhynchus mykiss) egg and survival of the produced larvae at about 12ºC. In the first experiment the water-based nanosilver particles was used at concentrations of 0.5, 1, 2 and 4 mgL^-1 for 30 minutes per day starting 24 hour post egg incubation until the hatching time. The mean percentage of hatchability reached in 27.6±0.2, 38.2±0.1, 41.6±0.4 and 48.6±1.5 in troughs treated with 0.5, 1, 2 and 4 mgL^-1 nanocid, respectively compared with 64.7±0.2 % for trough treated with malachite green at 2 mgL^-1 as positive control (P〈0.05) and 5.1± 0.2 % for trough without treatment (untreated group) (P〈0.05). In the second experiment the effect of the nanosilver particles was evaluated in the form of nanosilver dressing i.e. coating nanocid on the surface of the incubator troughs. The mean percentage of hatchability was 69.4±0.1% compared with 52.5%±0.1 recorded for normal control (trough without nanosilver dressing) (P〈0.05). When growing the produced larvae in the same troughs until one g in body weight, there was an insignificant increase in the weight of larvae kept in nanosilver trough (mean weight 1.12±0.09 g) compared to control group (mean weight 1.03±0.02g) (P〉0.05). These data suggest a possible application of nanosilver particles in aquaculture sector particularly using incubator troughs of trout containing nanosilver materials.
    Keywords: Aquaculture ; Biology ; Fisheries ; Silver nanoparticles ; Rainbow trout egg ; Hatchability ; Survival ; Oncorhynchus mykiss ; larvae ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 167-176
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  • 9
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    Effect of rotifers enriched with betaine and concentrated diet containing betaine on growth, survival and stress resistance of Indian white prawn (Fenneropenaeus indicus) (2021)
    In:  http://aquaticcommons.org/id/eprint/23865 | 18721 | 2018-08-01 05:13:19 | 23865 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-15
    Description: This study was conducted to investigate the effects of rotifers enriched with betaine and concentrated diet containing betaine on growth performance, survival and resistance to salinity (10 and 5Oppt), temperature (42°C) and formalin (100ppm) stresses in Indian white prawn (Fenneropenaeus indicus) post-larvae. A complete randomized design with three replicates per treatment in nine 20-1 tanks was chosen. Treatments were: Artemia nauplii, rotifers and concentrated diet (control); Artemia nauplii, rotifers enriched with betaine and concentrated diet (treatment 1) and Artemia nauplii, rotifers enriched with betaine and concentrated diet containing betaine (0.8%) (treatment 2). The larvae were fed 6 times per day at 4h intervals. There were significant differences in growth and survival rate between the treatments containing betaine (treatment 1 and 2) and control treatment (P〈0.05). Furthermore, the larvae that were fed with betaine (treatment 1 and 2) had significantly higher survival rate in stress resistance testes (P〈0.05). The present study showed that betaine has positive effect on growth performance, survival rate and resistance to stresses in Indian white prawn.
    Keywords: Aquaculture ; Rotifer ; Feeding ; Stress ; Artemia ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-10
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  • 10
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    Effects of dietary Betaine on growth, survival, body composition and resistance of fry rainbow trout (Oncorhynchus mykiss) under environmental stress (2021)
    In:  http://aquaticcommons.org/id/eprint/21825 | 18721 | 2018-01-10 17:07:44 | 21825 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-02
    Description: A four-week trial was conducted to evaluate the effects of different levels of dietary Betaine on growth, survival and resistance to salinity (35ppt), temperature (24 C), hypoxia and high and low pH stresses in rainbow trout (Oncorhynchus mykiss). Four levels of Betaine as 0 (control), 0.4% (B0.4), 0.8% (B0.8) and 1.2% (B1.2) were used with three replicates. Forty fish (0.67±0.15g) were stocked in each replicate and fed at 4-4.5% of body weight, five times daily. Results showed that there were significant differences in growth, survival, NPU, PER and FCR between B0.4, B1.2 and control diet (P〈0.05). Carcass analysis showed that there was higher protein in the carcass of fish fed with diet B0.4 compared to control and B1.2 diet. There were no significant differences in carcass protein content between B0.4 and B0.8. Also, no significant differences were found in carcass crude fat, ash and dry matter among different treatments (P〉0.05). Resistances to high and low pH (10.8 & 3.8) and to high temperature (24 C) were significantly better in fish fed with Betaine containing diets compared to the control diet. Resistance to high salinity in B0.4 was significantly better than the control diet and resistance to hypoxia in diet B0.8 was significantly better than the control (P〈0.05). The results showed that dietary supplementation of Betaine (0.4%) have positive effects on growth factors, survival, body composition and resistance to environmental stresses in rainbow trout.
    Keywords: Biology ; Fisheries ; Immunity system ; Rainbow trout ; Oncorhynchus mykiss ; Environmental stresses ; Feeding ; growth ; survival ; body composition ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 135-146
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