Amin Oujifard; Abdolmohammad Abedian Kenari; Ali Taheri
Volume 12, Issue 3 , September 2014, Pages 4-14
Abstract
The effects of inulin were studied on the growth indices, intestinal morphology as well as fatty acid profile of the Pacific white shrimp, Litopenaeus vannamei with average weight 3.21±0.03 g for 5 weeks. The experiment was carried in triplicate, was conducted in circular PVC tanks of 300 L capacity ...
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The effects of inulin were studied on the growth indices, intestinal morphology as well as fatty acid profile of the Pacific white shrimp, Litopenaeus vannamei with average weight 3.21±0.03 g for 5 weeks. The experiment was carried in triplicate, was conducted in circular PVC tanks of 300 L capacity with 25 shrimp per tank at the Aquaculture Center (Delvar, Bushehr province). Inulin was added to the diets at a 2 levels (0 and 2 percent). The shrimp were fed the experimental diets to visual satiety five times a day at 08:00, 12:00, 16:00, 20:00 and 24:00 h. No significant differences in growth performances (such as survival, feed conversion ratio (FCR), specific growth rate (SGR), Protein efficiency ratio (PER)) was observed, however, Dietary inulin brought about significantly improved 20:3n3 fatty acid content between the two treatments (P>0.05). Intestine epithelium cells height in the abdominal sections significantly (P< 0.05) were higher in shrimp fed by dietary inulin. The results of this study showed that supplement of 2% of inulin has positive effects on fatty acid profile and intestinal morphology in Litopenaeus vannamei.
Alireaza Safahieh; Sahel Pakzadtoochaei; Mohammad Taghi Ronagh; Bita Archangi; Mohammad Ali Hamzeh
Volume 12, Issue 3 , September 2014, Pages 15-25
Abstract
Heavy metals in marine ecosystems are from both natural and anthropogenic sources. The monsoon is a natural phenomenon that can effect the heavy metals concentration. The monsoon can affect heavy metal concentration in coastal areas through rainfall and leaching and also disrupting of water layer. The ...
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Heavy metals in marine ecosystems are from both natural and anthropogenic sources. The monsoon is a natural phenomenon that can effect the heavy metals concentration. The monsoon can affect heavy metal concentration in coastal areas through rainfall and leaching and also disrupting of water layer. The effect of monsoon on changes of concentrations heavy metals such as Cd, Cu, Ni, Pb and Zn in the sediment of Chabahar coast were studied in 2010. Samples were collected from the sediment of Gwatr, Beris, Ramin, Chabahar, Tis and Pozm stations in premonsoon, monsoon and post monsoon seasons (May, August and November respectively) during low tide. After preparation of samples, heavy metal concentration was determined by using the atomic absorption spectrophotometer. The concentration of Cd, Cu, Ni, Pb and Zn were 0.36, 4.97, 17.14, 8.88 and 24.93 µg/g dw respectively. The Cd concentration in the sediment was influenced by regional sources. The increase of Cu and Zn concentration from monsoon until post monsoon could be caused by rainfall and disturbance in the coastal sediments. The increase of Pb concentration in monsoon and post monsoon could be due to rapid precipitations of Pb, this increase could be affected due to coastal runoff in monsoon and the resumption of the vessel’s activity in post monsoon.
Ali Vaboonian; Abdolali Movahedinia; Alireza Safahieh; Saeyd A Hedayati
Volume 12, Issue 3 , September 2014, Pages 26-32
Abstract
Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very ...
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Different pollutants as well as heavy metals have undesirable effects on aqutic organisms and potentially may affect humans as a final consumer in food chains. Cadmium is one of the elements in most industrial effluents and so study on the effects of this dangerous element on aquatic animals is very important and necessary. In this study, acute toxicity of Cadmium on the Yellowfin Seabream, Acanthopagrus latus under laboratory conditions were examined. All experiments were according the standard methods for 96 hours exposure. Concentrations of 0.1, 1, 10 and 100 mg/lit Cadmium chloride were used to determine the Range Finding Test. Therafter fish were divided into 8 groups of 12 individuals with 3 replicates (100-120 g) One group was considered as the control and other groups were exposed to 15, 25, 35, 45, 55 , 65 and 95 mg/lit Cadmium chloride respectively. Important environmental parameters such as pH, dissolved Oxygen and temprature were measured and recorded. Data were analyzed using SPSS program and Probit statistical method. According to the results, lethal concentration (LC50), maximum acceptable toxicant concentration (MATC), lowest observed effect concentration (LOEC) and no observed effect concentration (NOEC) of Cadmium chloride for Yellowfin Seabream were 34.97, 3.497, 35 and 25 mg/lit respectively.
Hadi Dehghan; Mir Masoud Sajjadi; Paria Parto; Hamid Rajaian; Jafar Jalaei
Volume 12, Issue 3 , September 2014, Pages 33-41
Abstract
Rays are common elasmobranches in the northern waters of Persian Gulf and Oman Sea that may have one or more mineralized serrated stingers on the whip-like tail. The stingers are covered by epidermal cells among which some can produce venom. When these animals are dorsally touched, the stinger may be ...
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Rays are common elasmobranches in the northern waters of Persian Gulf and Oman Sea that may have one or more mineralized serrated stingers on the whip-like tail. The stingers are covered by epidermal cells among which some can produce venom. When these animals are dorsally touched, the stinger may be introduced into the aggressor by a whip reflex mechanism, causing severe mechanical injuries and inoculating the venom. A comparative morphological characterization of the stinger epidermal tissue of different ray species in the northern part of Persian Gulf and Oman Sea was carried out in this study. EDTA was used for decalcification of stings and conventional histological processes were subsequently employed. The results indicated that structure of dermis and epidermis layers of stings in all species are similar to those of corresponding layers in other parts of fish’s body. The results of the present study have also shown that all three examined species, had venom secretory cells. Distribution of venom secretory cells varies in each species; in Dasyatis bennetti and Himantura walga species, these cells presented in all covered epithelium of stings and in Himantura gerrardi, were in the ventral, ventro-lateral and dorso-lateral of the spine. These differences among the stingers of various species may explain the envenomation severity in these species.
g a; s m; f n
Volume 12, Issue 3 , September 2014, Pages 42-50
Arash Shakouri; Seyed Mohamad Bagher Nabavi; Preeta Kochanian; Ahmad Savari; Alireza Safahiye
Volume 12, Issue 3 , September 2014, Pages 51-62
Abstract
Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with ...
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Considering the importance of environmental factors on marine organisms, a survey of factors that affect the subtidal sea cucumber community was carried out in the eastern part of Chabahar Bay, a region with anthropogenic effects on marine ecosystem, from May 2007 to July 2008. Four quadrates with 100m2 area were sampled with SCUBA diving method in each region. Temperature had significant variation among the stations and seasons. There is a positive correlation (99%) between salinity and sea cucumber density and a negative correlation (95%) between turbidity and density. PCA indicated that salinity, pH, turbidity and temperature had 82.78% of all variance of the environmental factors and other factors did not exhibit such a relation with sea cucumber dispersion. Northern stations (Sepah and Kalantary) were located in same category in Fall 2007 and Winter 2008. These stations had the least pH and the highest salinity and turbidity in Fall and the highest pH and the least turbidity in Winter. Southern stations (Beheshti and Hotel Daryai) located in the same category in summer and fall 2007. These stations had the most pH and the least salinity in the summer and the most temperature and turbidity in the fall.
Masoud Mahmoudaf; Vahid Chegini
Volume 12, Issue 3 , September 2014, Pages 63-73
Abstract
In this article, two three-dimensional hydrodynamic and numerical models, COHERENS and BOM are used to investigate the renewable tidal energy in Khoore Musa. Firstly, the effect of 6 tidal constituents on regional hydrodynamic is estimated in 10 sigma levels in vertical and 250 resolution. The results ...
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In this article, two three-dimensional hydrodynamic and numerical models, COHERENS and BOM are used to investigate the renewable tidal energy in Khoore Musa. Firstly, the effect of 6 tidal constituents on regional hydrodynamic is estimated in 10 sigma levels in vertical and 250 resolution. The results of both models are verified with field data recorded by Iranian National Institute for Oceanography. It is found that the outcomes of COHERENS are more reliable but calibration is required. Whereas the accuracy of calibrated hydrodynamic module of COHERENS is approved, the energy of tidal currents is calculated. In this study, the current energy module is developed and set as a supplementary module. Hourly averaging of current energy during one month indicated that the maximum value recorded was more than 0.65 MWh. The maximum depth-integrated energy of this area was about 5 MWh. The best and more advantageous area to extract energy is a strait in the Middle-Bar with density of more than 300 .
Dara Mirzabagheri; Seyed Mohammad Bagher Nabavi; Alireza Mehvari; Kambiz Karami
Volume 12, Issue 3 , September 2014, Pages 74-86
Abstract
A general description of distribution patterns of rocky shore cructacea along the Hormuz Island coasts is presented to provide the context for comparisons of distribution patterns of this intertidal organisms. In order to test if there was any variation in species distribution and abundance from upper ...
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A general description of distribution patterns of rocky shore cructacea along the Hormuz Island coasts is presented to provide the context for comparisons of distribution patterns of this intertidal organisms. In order to test if there was any variation in species distribution and abundance from upper to lower intertidal zone (littoral zone) along the entire rocky shores of the Hormuz Island, three main regions (west, south and south-eastern) were studied and 3 transects were sampled in each region. At each one of the 9 transects the shore was levelled and a general qualitative description was made, which also aided grouping of subsequent quantitative sampling. Photographs and slides were taken from the live specimens and then specimens were fixed in 4% formalin and transported to lab for analyses. The upper zone was characterized by the presence of Balanus amphitrite. The midlittoral zone was essentially dominated by Balanus amphitrite. The distribution patterns observed on the lower zone showed a similarity between rocky shores located in south and south-east of the Hormuz Island dominated by Elasmopus sp.. It has also provided important information on abundance and seasonal distribution of cructacea in rocky shores of the Hormuz Island. According to the results abundance of cructacea was markedly lower in Summer compared to Winter. In conclusion species of cructacea is prevailing and environmental conditions and bed is the main reason for high abundance of this class. Distribution of crustacean is mainly affected by prevailing environmental conditions and the substratum type.
ebrahim Alizadeh Doughikollaee
Volume 12, Issue 3 , September 2014, Pages 91-100
Abstract
Heavy metals pollution directly has a negative effect on marine aquaculture such as shrimp culture. Heavy metals accumulated in the shrimp can be transported to humans through food chain. In this study, concentration of heavy metals (Cu, Zn, and Ni) in muscle tissue of western white leg Shrimp (Litopenaeus ...
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Heavy metals pollution directly has a negative effect on marine aquaculture such as shrimp culture. Heavy metals accumulated in the shrimp can be transported to humans through food chain. In this study, concentration of heavy metals (Cu, Zn, and Ni) in muscle tissue of western white leg Shrimp (Litopenaeus vannamei) in farms of Rig, Helle and Delvar sites of Bushehr province was determined. Heavy metals concentration was measured by atomic absorption. Results showed that there was a significant difference between Zn and Ni concentration of muscle shrimp in Rig, Helle and Delvar sites. The highest concentration of copper in Delvar, zinc in Rig and nickel in Heleh was observed 20.12 ± 1.28, 56.12 ± 9.33 and 9.10 ± 0.87 (μg / g DW) respectively. The comparison results of metal concentrations in muscle tissue of shrimp with FDA, WHO and FAO standards showed that the nickel content in muscle tissue is higher than the permissible level for human consumption and requires further monitoring.
Seyyed Nasrollah Hosseini
Volume 12, Issue 3 , September 2014, Pages 86-91
Abstract
Abstract The properties of kiddi shrimp (Parapenaeopsis stylifera) gel added with different levels of egg white (EW) and whey protein concentrate (WPC) (0.5-5%) were studied. Textural parameters of the gels improved by adding EW and WPC up to 3 and 1 percent respectively and then declined (p≤0.05). ...
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Abstract The properties of kiddi shrimp (Parapenaeopsis stylifera) gel added with different levels of egg white (EW) and whey protein concentrate (WPC) (0.5-5%) were studied. Textural parameters of the gels improved by adding EW and WPC up to 3 and 1 percent respectively and then declined (p≤0.05). The main factor to improve the textural parameters was the proteinase inhibitory effect of these additives as evidenced by the decline on trichloroacetic acid soluble content. The amount of expressible moisture of the gels increased with EW and WPC indicating that more water participated on gel three-dimentional network. Sodium dodecyl sulfate polyacrylamide gel electrophoresis study revealed that myosin heavy chain (MHC) didn't undergo polymerization to a higher extent in the presence of EW and WPC, and the strengthening effect on gel attained in another way except polymerization. On the other hand addition of EW resulted in a higher lightness. Therefore EW and WPC play an important role in improving the gel properties of kiddi shrimp mince. Keywords: egg white – whey protein concentrate – gel – kiddi shrimp