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  • Analytical Chemistry and Spectroscopy  (7,463)
  • Iran  (2,800)
  • 2020-2022  (2,794)
  • 1990-1994  (7,469)
  • 1
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    In:  http://aquaticcommons.org/id/eprint/4720 | 1256 | 2011-09-29 15:59:01 | 4720 | Freshwater Biological Association
    Publication Date: 2021-07-05
    Description: Widespread pollution by heavy metals generated by various industries has serious adverse effects on human health and the environment. Cadmium is a heavy metal recognised as one of the most hazardous environmental pollutants. It is a non-essential and non-beneficial element to organisms, causing toxicity and other deleterious effects on various components of the aquatic environment. The ability of algal periphyton to concentrate cadmium from fresh water is well known. Moreover, periphyton communities are able to accumulate large amounts of cadmium despite its low concentration in fresh water. Many researchers use algal periphyton as an indicator of water quality in aquatic environments. In the present study, the authors ask two basic questions: Does cadmium accumulate along a food chain consisting of the periphyton community and a grazer species (Physa sp.) under semi-natural conditions provided by artificial streams? If not, which one can better indicate the water quality?
    Keywords: Biology ; Ecology ; Limnology ; Periphyton ; Cadmium ; Rivers ; Experimental research ; Bioaccumulation ; Chemical pollution ; Iran ; Kermanshah
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
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    Format: 15-26
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  • 2
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    Tehran University, Kish International Campus
    In:  http://aquaticcommons.org/id/eprint/21028 | 17408 | 2018-08-20 05:43:30 | 21028 | Tehran University, Kish International Campus, Kish Island, Iran
    Publication Date: 2021-07-13
    Keywords: Biology ; Fisheries ; Cymo andreossyi ; Persian Gulf ; Iran
    Repository Name: AquaDocs
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  • 3
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    In:  http://aquaticcommons.org/id/eprint/21695 | 18721 | 2017-11-27 11:56:25 | 21695 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-28
    Description: Caspian brown trout (Salmo trutta caspius) is one of the economically valuable species in the Caspian Sea.Artificial propagation and production of larvae are the main problems in the early culture of this species.The purpose of this paper is to study the effect of reproductive performance of female broods on opposition reproduction efficiency in Caspian brown trout in the breeding season of 2009. Three groups of female broods (4, 5 and 6 years old) were fertilized with 9 male fish individually. The results showed that,6 year old females have maximum body weight (2150.0 ± 86.6 g), total length (59±2 cm), eggs weight (255.0 ± 30.51 g), egg size (5.37 ± 0.058 mm) and absolute fecundity rate (3060 ± 366.15), while highest average number of ovules in each gram of body weight (16.33 ± 0.58) and relative fecundity (2.08 ± 0.12) belonged to 4 years old females. There were significant differences in mean fertilization rate and survival rate until absorption of yolk sack stage (p〈0.05) among the treatments studied. The present study showed that the eggs produced from fertilization of 6 year old female eggs and male mixed milt showed maximum average fertilization percentage (97.5 %), survival rate until eyed stage (92%), hatching percentage (93%), and survival rate until absorption of yolk sack (94.5%).
    Keywords: Biology ; Fisheries ; age ; reproductive ; performance ; female ; Caspian Sea ; Salmo trutta caspious ; Iran ; larvae ; weight ; male
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 97-103
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  • 4
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    In:  http://aquaticcommons.org/id/eprint/21701 | 18721 | 2017-11-27 12:19:48 | 21701 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-28
    Description: Guilan province is located in south and south-west of the Caspian Sea. Guilan is one of the richest and the most humid region in the country due to suitable climate, ample rainfall and many water sources (springs,rivers, creeks,..),. Despite the prevailing favorable conditions, limnological studies, especially in the mountainous regions of this province are limited. A limnological study was conducted in the Lakan area from March to June in 2008. Macrobenthos were sampled from the freshwater stream that were mostly composed of freshwater crabs. The samples were transported to the Natural History Museum in Frankfurt, Germany, and the crab species was identified as Potamon bilobatum belonging to Family Potamidae. The physico-chemical characteristics of water and the study area have been recorded.
    Keywords: Biology ; Fisheries ; first report ; freshwater ; crab ; species ; Potamon bilobatum ; Guilan ; Lakan area ; macrobenthos ; limnological ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: 279-283
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  • 5
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    In:  http://aquaticcommons.org/id/eprint/21711 | 18721 | 2017-11-27 14:08:10 | 21711 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-29
    Description: This study is an attempt to evaluate the biomonitoring capabilities of rock oyster, Saccostrea cucullata, for mercury (Hg) pollution. The oyster and sediment samples were collected from 10 rocky habitats of Qeshm and Hormoz Islands in the Persian Gulf. The concentration of mercury in the shell and soft tissues of the oysters and sediments were analyzed using an advanced mercury analyzer. Biota-sediment accumulation factor (BSAF) was calculated based on the ratio of Hg concentrations in soft tissues to that in sediments.The results showed that the rate of mercury accumulation in the soft tissues of the oyster was significantly higher than that in its shell (P 〈 0.05). There was a significant correlation between mercury concentrations in the soft tissues and the sediments (r =0.75). According to BSAF, soft tissues of the oyster were recognized as an appropriate indicator for biomonitoring mercury. The present study generally supports the usability of soft tissue of S. cucullata as a sensitive biomonitoring organ to warn mercury pollution in the Persian Gulf.
    Keywords: Biology ; Fisheries ; Pollution ; biomonitoring ; mercury ; Persian Gulf ; rock oyster ; Saccostrea cucullata ; Iran ; pollution ; tissues
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 145-155
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/21734 | 18721 | 2017-11-28 08:59:37 | 21734 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-30
    Description: The research was accomplished in order to study behavioral and histopathological effects of Copper on Rutilus rutilus caspicus under experimental condition. The study was performed using Water Static Method during 96 hours. 15 fish with averaged weight 2±0.5 g in weight were encountered to different concentrations (0, 0.1, 0.2, 0.3, 0.4 mg/l) of Copper. A group of fish was considered as control. Under stable condition and aeration, the lethal concentration was 0.4 mg/l. Results indicated that there was significant differences between treatments when copper concentration increased (p〈0.05). It was found that in the high concentration of Copper nominal signs of toxicity such as convulsion, air gulping and flared operculum were observed. Histopathological sings were hyperplasia, edema, hyperemia, hemorrhage, expansion of Bowman’s capsule and hepatocytes necrosis. In control group no lesion was observed.
    Keywords: Biology ; Chemistry ; Fisheries ; copper ; sulphate ; behavioral ; histopathological ; Rutilus rutilus caspicus ; Caspian Sea ; Iran ; hyperplasia
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 73-79
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  • 7
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    In:  http://aquaticcommons.org/id/eprint/21737 | 18721 | 2017-11-30 03:25:09 | 21737 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-30
    Description: The length-length (LLRs), length-weight (LWR) relationships and relative condition factor (Kn) of 505 specimens of pike, (Esox lucius Linnaeus, 1798) from Anzali Wetland, southwest of the Caspian Sea, were studied from April 2012 through March 2013. The length-length relationships among total length (TL), fork length (FL) and standard length (SL) for pike were found to be highly significant (r2〉0.986, P〈0.001). The values of b in length-weight relationship in males (3.1495), females (3.1843) and for all specimens (3.2137) indicated isometric growth. Mean relative condition factor for male, female and all specimens were 1.003, 1.004 and 1.008 respectively. The result of LWR could be used for fishery managers to approve appropriate regulations for sustainable fishery management. Few studies have been conducted on these parameters of pike and this is the first report on LLRs, LWR and Kn of pike from Iranian waters.
    Keywords: Biology ; Fisheries ; length ; weight ; relationship ; relative ; condition ; pike ; Esox lucius ; Anzali wetland ; Caspian Sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 109-117
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  • 8
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    In:  http://aquaticcommons.org/id/eprint/21742 | 18721 | 2017-11-30 03:27:22 | 21742 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-30
    Description: The aim of this study was to provide necessary information on the age, growth and sex ratio of one of commercially important cyprinid species, Alburnus chalcoides in the southern Caspian Sea (North of Iran) from 2010 through 2011. 53 specimens of both sexes (males and females) were collected monthly. The samples were transported to the laboratory for further biological measurements and otolith extraction. The maximum and minimum age of A. chalcoides was 4+(FL=26.0 cm) and 1+ (FL= 18.1 cm), respectively. The mean fork length of A. chalcoides was 20.21±0.287 cm; and the sex ratio was 1.00: 2.12. The calculated length-weight relationships for all individuals were as W=0.141TL2.199 (R2= 0.648). Different regressions were prepared between age and morphological measurements of fish and otolith, of which the highest correlation was between age and body length as a linear regression of TL=1.959Age+16.32 (r= 0.66). There was no significant correlation between morphometric measurements of otolith and fish morphological parameters (p〉 0.05), and an allometric growth was found with a slope of b=1.926 for the study area.
    Keywords: Biology ; Fisheries ; age ; determination ; morphology ; otolith ; Alburnus chalcoides ; Caspian Sea ; Iran ; sex ; growth ; morphometric
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 205-214
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  • 9
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    In:  http://aquaticcommons.org/id/eprint/21739 | 18721 | 2017-11-28 09:08:10 | 21739 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-30
    Description: SWOT analysis is used extensively as an assessment and planning method, particularly in tourism planning. However, there are little documentations on application of SWOT analysis in ecotourism. An assessment on systematic use of SWOT analysis was carried out in the present study to highlight the applicability of the SWOT technique in detailed investigations. In this study, based on field surveys and questionnaires (on Anzali Wetland and the local population), matrix of internal and external factors (threats, opportunities, weaknesses and strength) influencing tourism development in Anzali Wetland were evaluated within the framework of SWOT analysis and SO, WO, ST and WT strategies were identified. Based on the obtained results, the total score of 3.22 in IFE matrix suggests good condition of the system and high internal strength of the tourism development related to internal factors and the final score of 2.93 in the EFE matrix represents poor condition related to the external factors which means external factors have not been utilized properly; Thus appropriate planning and organizational management practices are required to deal with these factors. The study further proposes solutions, operational priorities and strategic planning according to environmental and local conditions of Anzali Wetland. Since the tourism industry in Iran is still in its early stages, particularly in Anzali Wetland region, the findings could help decision makers to estimate better the weaknesses, strengths, threats and opportunities, and to develop tourism industry in the region.
    Keywords: Environment ; Sociology ; environmental ; strategic ; assessment ; ecotourism ; potential ; Anzali wetland ; SWOT analysis ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 155-164
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  • 10
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    In:  http://aquaticcommons.org/id/eprint/21751 | 18721 | 2017-11-30 04:32:38 | 21751 | University of Guilan, Faculty of Natural Resources, Iran
    Publication Date: 2021-06-30
    Description: Feeding habits of Caspian marine shad Alosa braschnikowii (Borodin, 1904), inhabiting in the western part of Caspian Sea such as prey spectrum and seasonal dynamics have been studied. As in other parts of Caspian Sea, throughout the year, the main hunt of Caspian marine shad constituted kilkas, gobies and shrimps while other groups of zoobenthos were represented in a lesser extent. Importance of other fishes and zoobenthos in the diet of Caspian marine shad is influenced by their ecological morpho-functional peculiarities. Seasonal changes of species composition and proportions of fodder food items are caused by life cycles of fishes and migrations of fodder entities. The changes of food composition depending length of fishes, the depth and haul region are analyzed. Caspian marine shad most intensively feeds in spring (March – April) before spawning and in summer (July) after spawning.
    Keywords: Biology ; Fisheries ; features ; feeding ; Alosa braschnikowi ; diet ; food ; zoobenthos ; gobies ; kilka ; Caspian sea ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 77-83
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