Mohammad Forouhar Vajargah; Masoud Sattari; Javid Imanpur; Mehdi Bibak
Abstract
Length-weight relationship and some growth parameters of Rutilus kutum were studied. In total, 112 specimens of kutum were collected randomly from beach seines at the southern shores of the Caspian Seafrom October 2016 to May 2017. The mean (±SD) total length, fork length, and weight for the whole ...
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Length-weight relationship and some growth parameters of Rutilus kutum were studied. In total, 112 specimens of kutum were collected randomly from beach seines at the southern shores of the Caspian Seafrom October 2016 to May 2017. The mean (±SD) total length, fork length, and weight for the whole population were 38.58±8.14, 35.57±7.65 cm and 659.48±334.06 g, respectively. The minimum and maximum length and weight of fish in different seasons were 16.5 and 51cm as well as 45 and 1525g, respectively. The mean (±SD) gonadosomatic and hepatosomatic indices for the whole population were 4.67±5.28 and 7.86±5.83, respectively. Analyses of length-weight relationships showed a strong correlation between these two parameters (R2=0.90). The length-weight ratio in males, females and total population were W= 0.821 L2.4278, W=0.01 L3.0025, W=0.041 L2.6224,respectively. The t-test analysis showed a negative allometric growth pattern for males and the whole population, whereas females followed isometric growth pattern. The mean (±SD) condition factor (CF) were 1.10±0.41 in males, 1.01±0.11 in females and 1.07±0.35 in the whole population. The mean CF was higher in males in comparison with females, although the differences were not statistically significant.
Sayede Amene Hossaini; Mohammad Forouhar Vajargah; Mohammad Javad Vesaghi
Abstract
Morphometric and meristic traits typically are used to identify the stocks. The aim of this study was to identify the biological status of Aphanius vladykovi in four regions: Dehcheshme River, Shalamzar Lake, Madar-o-Dokhtar Spring and Chehelgazi Spring. 20 samples in each region were used to biological ...
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Morphometric and meristic traits typically are used to identify the stocks. The aim of this study was to identify the biological status of Aphanius vladykovi in four regions: Dehcheshme River, Shalamzar Lake, Madar-o-Dokhtar Spring and Chehelgazi Spring. 20 samples in each region were used to biological assess and 23 morphological and 8 meristic characters were examined. The final data were normalized and analyzed with Excel and SAS software version 9.1 with Duncan analysis of variance and to determine the length-weight relationship was used W=aLb regression equation. Regression coefficients growth pattern, with Pauli applicable method showed fish growth in the Shalamzar region was allometric and in other regions was isometric. Also variance analysis of main components revealed that among the areas were observed significantly different at 5% level at characters of: the minimum height of the body, distance behind the dorsal fin, ventral and pectoral fin spacing, the base of the pectoral and ventral fins, diameter of the gill cover, distance from tip of snout to ventral fin, body weight, number of pectoral, anal and caudal fin rays, number of lateral line scales and the number of gill raker and filaments, that suggesting the possible impact of these features in distinguish the populations of this species.
Mohammad Forouhar Vajargah; Hamed Ghafari Farsani; Saeid Shahbazi Naserabad; Aliakbar Hedayati
Abstract
Abstract Different organisms like aquatics are constantly exposed to pesticide residues, this study's overall assessment patho-biological changes in gills and livers of Capoeta capoeta gracilis during exposure to butachlor pollutant. First of all the 96-hour lethal concentration of the toxin was calculated ...
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Abstract Different organisms like aquatics are constantly exposed to pesticide residues, this study's overall assessment patho-biological changes in gills and livers of Capoeta capoeta gracilis during exposure to butachlor pollutant. First of all the 96-hour lethal concentration of the toxin was calculated as 46.2 mg per liter. Then, 96 fish were divided into four groups: one control group and three experimental groups (with concentrations of 0.2, 0.4, and 0.8 mg l-1) and were exposed for 2 weeks. In the end point, histological changes were studied by hematoxylin and eosin staining method in light microscopy. Lethal concentration of this toxin was 2.46 mg/l that means moderate toxicity of this species. There was many histological changes in the gills of fish treated with butachlor include: hyperplasia, shortening the secondary lamella, edema, fusion, hemorrhage and atrophy in compared to the control group. Treatment with liver butachlor cause obstruction, dark granules, necrosis, and bile stagnation and sinusoid dilution in studied fish. The results of this study showed that in both studied organs with increase of toxin concentration, more severe tissue damage was observed, so gill and liver tissues of this fish could be used as an appropriate biomarker for pollutant measurement.
Mohammad Forouhar Vajargah; Seyed Aliakbar Hedayati
Abstract
Abstract One of the most important factors that today is important with the risks associated of the growing industry and technology, is plant pesticides that can lead to the destruction of aquatic communities in the long times by entering aquatic ecosystems. So in current study acute toxicity of butachlor ...
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Abstract One of the most important factors that today is important with the risks associated of the growing industry and technology, is plant pesticides that can lead to the destruction of aquatic communities in the long times by entering aquatic ecosystems. So in current study acute toxicity of butachlor poison that is a very common at the agricultural plant was studied in 5-7 gr common carp and Caspian roach for detection of LC50 at 96 hour. Experiment was in static plan and based on the OECD standard conducted for 4 days; water physicochemical parameters including PH, dissolved oxygen and temperature were measured that they were in suitable ranges. Based on the results, acute toxicity of butachlor on carp and Caspian roach were 0.785 and 0.258 mg/l respectively and maximum allowable concentration MAC value were calculated as 0.078 and 0.025 mg/l respectively. According to the standard for determine of the toxicity of various pesticides, butachlor was considered more highly toxic for Caspian roach than common carp.
Mohammad Javad Vesaghi; Aliasghar Khanipour; Masoud Sattari; Mohammad Forouhar Vajargah
Volume 5, Issue 2 , December 2016, , Pages 87-96
Abstract
This study carried out on 194 fish (Garra rufa) during the months of January to March at eight stations in Dinvar River located at Kermanshah province. During this study, 34 attributes and 11 traits count was measured geometric parameters and natural mortality and total amount 0.346, infinite length ...
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This study carried out on 194 fish (Garra rufa) during the months of January to March at eight stations in Dinvar River located at Kermanshah province. During this study, 34 attributes and 11 traits count was measured geometric parameters and natural mortality and total amount 0.346, infinite length L∞=124.57 mm, growth factor K=0.29 and the length and weight of the exponential function of growth were calculated. The length-weight relationship was calculated for each season separately, which indicates isometric growth during summer and autumn and allometric growth during the winter and spring seasons. The length-weight relationship for the whole year was calculated aqual to W= 1/000095L2/97. Male to female sex ratio of 1: 1.44 were calculated for faster growth in males and natural selection is directed towards the elimination of larger samples. Results indicate that the Dinvar river is a good place for spawning and nursery to Brood fish. The data were confirmed by isolation of populations between the stations and it seems that fish populations of stations are panmictic. However, further studies confirm that these results depends on genetic traits, physiological and Osteology Lange populations.
M. Bayati; R. Patimar; M. Farhangi; M. Farhangi; M. Forouhar Vajargah
Volume 3, Issue 4 , July 2015, , Pages 67-78
Abstract
Abstrac The aim of this study was to determinate the effect of trout farm sewage on fecundity and diversity of macro invertebrate benthoses with some biological indices. This study was done on the Marber River in Semirom city, the southwest area of Isfahan province. Sampling was took place in five stations ...
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Abstrac The aim of this study was to determinate the effect of trout farm sewage on fecundity and diversity of macro invertebrate benthoses with some biological indices. This study was done on the Marber River in Semirom city, the southwest area of Isfahan province. Sampling was took place in five stations on summer of 2012, monthly using a Surber sampler (30.5cm×30.5 cm). Sampling in each station was done in three points (edges and middle of the river). Captured samples were fixed in 4% formalin and were taken to the laboratory. In laboratory animals were collected with a sieve of 500 microns in diameter springs to assort and identify to the least level possible (families and genera). In this study, several biological parameters such as: Abundance, Biomass, Similarity, Shannon-Wiener, EPT/ Chironomidae, Margalef richness, Hylsnhvf, BMWP index and ASPT index was used. Eventually 20 families, with 10 orders, 7 classes and 5 phyla were identified.
