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.
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.
Nabiallah Kheirabadi; Sanaz Estekani
Volume 6, Issue 3 , March 2018, , Pages 61-70
Abstract
This study was directed in the four stations of the coast of Noor, Mahmoudabad and Royan cities (Mazandaran Province) located in the coast of the Caspian Sea for identification and determine some ecological factors of crab Rhithropanopeus harrrissi. Samples of each station were fixed and transported ...
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This study was directed in the four stations of the coast of Noor, Mahmoudabad and Royan cities (Mazandaran Province) located in the coast of the Caspian Sea for identification and determine some ecological factors of crab Rhithropanopeus harrrissi. Samples of each station were fixed and transported to the laboratory and were identified at the species level. The 192 collected samples were found to be Rhithropanopeus harrrissi in the laboratory analysis. In order to verifying the species, our samples compare with the metatypical crab samples in the Zoological Museum, University of Tehran. Also in this species, morphological features, sex ratio, abundance and distribution were analysis. The one ways ANOVA with LSD test showed a significant difference (p
Nasrin Bazdidvahdati; Katayoun Karimzadeh; Asgar Zahmatkesh; Fatemeh Bazdidvahdati
Volume 6, Issue 1 , May 2017, , Pages 23-34
Abstract
Heat shock proteins belong to a big family of proteins which are heat-tension dependent and are inductable by heat-stress. They can save the living organisms against suddenly fluctuation of environmental conditions and cause the stability of other protein. Pontogammarus maeoticus is one of the most abundant ...
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Heat shock proteins belong to a big family of proteins which are heat-tension dependent and are inductable by heat-stress. They can save the living organisms against suddenly fluctuation of environmental conditions and cause the stability of other protein. Pontogammarus maeoticus is one of the most abundant amphipods at the south of Caspian Sea coast. In this study the presence of heat shock proteins in Pontogammarus (male and female species) by treating at laboratory conditions and levels of temperature (20, 25 and 30 oC) was investigated. Samplings were carried out at coast of Hassan Rood (guilan province). The levels of proteins were determined by Bradford and ELISA methods. Statical analyses of data were carried out by one-way ANOVA and Duncan test. The results showed that by temperature increasing, the levels of Heat- shock proteins and absorbtion of ELISA were increased and the highest absorbance was observed in treating at 30 oC after four hours. Increasing the treating temperature between 5 until 10 oC more than the optimal value causes the more synthesis of heat shock protein 70 with molecular weights of 66.5 and 90 KD both in male and female species of Pontogammarus. In other words the results of this study express that by increasing the temperature the level of heat shock protein 70 will be increasing.
E. Haghighy; M. Sattari; S. Dorafshan; Y. Keivany
Volume 3, Issue 4 , July 2015, , Pages 37-46
Abstract
Abstract
Spirlin, Alburnoides eichwaldii, is an abundant riverine fish in the south west Caspian Sea basin. Sixty specimens of Spirlin from Kargan-Rud, and Lamir (30 specimens from each river) were studied and compared from morphological point of view in August 2010.Thirty-one morphometric characters ...
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Abstract
Spirlin, Alburnoides eichwaldii, is an abundant riverine fish in the south west Caspian Sea basin. Sixty specimens of Spirlin from Kargan-Rud, and Lamir (30 specimens from each river) were studied and compared from morphological point of view in August 2010.Thirty-one morphometric characters were measured and thirteen meristictraits were counted on each specimen. Nonparametric methods for comparison of means and Principal Component Analysis (PCA) for separation of populations were used. Among the meristic characters, nine characters were significantly different between the four populations (p<0.05). Among the morphometric and relative morphometric characters, nineteen characters showed significant differences (p<0.05) between the two populations. In the PCA of meristic characters, three factors accounted for 47.5% of variations within populations, including; caudal peduncle scales, scale above lateral line and anal fin ray numbers. Within the morphometric characters, three factors accounted for about 71% of variations within the two populations, including dorsal fin height, pectoral fin base, ventral fin length, caudal peduncle depth, head length, inter orbital width, standard length to pre dorsal length, head length to snout length, head length to eye diameter and head length to inter orbital width. The results showed while morphometric and relative morphometric characters were not useful for separating the two populations and sexes, the meristic characters could relatively separate these two populations.
