فهرست مطالب

the Persian Gulf (Marine Science) - Volume:6 Issue: 19, Spring 2015

Journal of the Persian Gulf (Marine Science)
Volume:6 Issue: 19, Spring 2015

  • تاریخ انتشار: 1394/06/23
  • تعداد عناوین: 7
|
  • Nasrin Rahimi Yadkoori, Nasim Zanguee, Seyed Mohammad Mousavi, Mohammad Zakeri Pages 1-10
    This study was conducted to determine effects of dietary administration of different levels of ginger (Zingiber officinale) extract on digestive enzymes activity and liver composition of Mesopotamichthys sharpeyi during eight weeks. In this respect, 192 M. sharpeyi fingerlings (with initial weight 11.67 ± 0.32 g) were divided into three ginger extract (0.1%, 0.5, 1%) treatment groups in triplicates. Control group did not receive ginger extract. Feeding of fish was done based on three percent of body weight. At the end of the experiment, digestive enzyme activity (Amylase, Trypsin and Alkaline Phosphatase) and liver lipid and glycogen contents were measured. Results showed applying ginger extract enhanced activity of digestive enzymes differently. Amylase activity improved but, Trypsin activity not affected (P<0.05). The highest ALP activity occurred under 1% supplemented diet, but overall, no significant difference was observed compared with control. The highest level of glycogen concentration was observed in 1% ginger extract supplemented diet (P<0.05). The highest liver lipid concentration was observed in treatment 2 (P<0.05). In general, it is concluded that addition of ginger extract to feed increases activity of some digestive enzymes and stored energy compounds in the liver of Mesopotamichthys sharpeyi fingerlings.
    Keywords: Mesopotamichthys sharpeyi, Ginger extract, Digestive enzyme activity, Liver composition
  • Mojtaba Zoljoodi Pages 11-20
    The meteorological conditions during the period of spring transition over the Middle East and the Persian Gulf and adjacent land area is investigated. Monthly and seasonal variations of large-scale atmospheric patterns and wind aloft features at different levels were drawn from data collected from the National Centers for Environmental Prediction and National Center for Atmospheric Researches. The variations of atmospheric pressure patterns as indicated by monthly wind vectors of 1000, 850, 500 and 200 hPa and sea level pressure changes during summer, winter and spring months over the study area were analyzed. We found that the axis of the maximum wind at 500 and 200 hPa during the spring transition is moved northward from 27°N to 33°N; at 1000 hPa, the Omani Convergence Zone illustrated two closed adjacent cells, especially in April. Furthermore, sea level pressure variations during spring showed the expansion of pressure fall from Indian peninsula toward Pakistan and southeastern parts of Iran. When pressure fall reaches its abyth in May over India, Pakistan and also around the The Persian Gulf (about 7 hpa), it is the sign of the onset of the Monsoon over the region. Interesting feature at 850 hPa is the strengthening of the wind speed during the transition over the northern part of the The Persian Gulf with a peak around 7.5 m/s.
    Keywords: Spring transition, Middle East, Persian Gulf, Atmospheric pressure patterns, Monsoon
  • Jafar Seyfabadi, Mohammad Mehdi Zamani Jamshidi, Alireza Mahvary, Nabiallah Kheirabadi Pages 21-28
    Shell selection indices of the dominant hermit crab Clibanarius signatus Heller, 1861, in the Larak Island were studied from September 2011 to June 2012. Among 739 sampled specimens, 41 different gastropod shell types were selected as shelters based on their abundance and local availability. A significant positive correlation (P<0/01) was found between the dimensions of the hermit crab, Clibanarius signatus and dimensions of the occupied gastropod shells.
    Keywords: Clibanarius signatus, Larak Island, Paguroidea, Shell selection behaviour
  • Mahboobeh Vosoo, Gholamreza Mirab Shabestari, Arash Amini Pages 29-42
    Babolsar eastern coastal dunes have been developed along the southern coast of the Caspian Sea. The studied area is coordinated in N36°43' to N36°44' latitude and E52°44' to E52°52' longitude. The objectives of this research were to: Study mineralogy and geochemistry of sand dunes, to obtain chemical alteration index (CIA) and its relationship to climate and mineralogy, to determine the potential accumulation of heavy minerals and trace elements and to identify sedimentary processes, climate, source rock geochemistry and mineralogy of the deposits. In this research, 43 dune samples were collected from 4 different areas of coastal dunes, out of which 14 samples were analyzed using X-ray fluorescence method (XRF) for major oxides and trace elements. A comparison was made between sand dunes, river and beach. To increase the accuracy of the mineralogical study of sediments, 7 microscopic thin sections were prepared. The mineralogical analysis of the coastal sand dunes indicates that the average amounts of quartz, feldspar and rock fragments found in these samples are 29.56%, 7.42% and 63.02%, respectively. Much of the rock fragments were respectively sedimentary, volcanic, plutonic and finally metamorphic rock fragments with the lowest amounts. The abundance of carbonate sedimentary rock fragments in Babolsar coastal sand dunes can be caused by proximity to the carbonate source rock. The average amount of chemical alteration observed in coastal dunes of Babolsar was 89.39%, which is similar to coastal dunes of Miankaleh (=88.44%). It seems that warm and humid climates predominate in both of Miankaleh and Babolsar coastal sand dune areas. The concentration of TiO2, Fe2O3, MgO and heavy minerals in the coastal dunes of Babolsar were reduced eastward. This pattern of decreasing main oxides of iron, titanium and magnesium with the direction of prevailing winds in the area from west to east is in agreement and proves that the distribution pattern of major oxides which form dark heavy minerals in the sand dune samples have been more affected by the prevailing winds in the region.
    Keywords: Chemical index of alteration, Major elements, Trace elements, Heavy mineral evaluation, Abundance of rock fragments
  • Sana Sharifian, Ehsan Kamrani Pages 43-52
    Morphometric characters are important to estimate the population of crustacean species. In the present study, relationships between various morphometric characters of the freshwater crab Sodhiana iranica was studied at Eelood freshwater spring of southern Iran. Crabs were collected randomly from April 2012 to April 2013 bimonthly. A total of 69 (43.67%) females and 89 (56.32%) males were collected. Comparison of mean carapace width and total weight in both sexes showed no significant differences. The CL– CW relationship was CW=1.14 (CL) +1.23 for females, and CW=1.16(CL) +2.11 for males. The CW– TW relationship was TW=0.0003(CW) 3.01 for females, and TW=0.0003(CW) 2.98 for males. The CL– TW relationship was TW=0.0009(CL) 2.81 for females, and TW=0.0033(CL) 2.45 for males. The relationship between carapace width and weight for both sexes of S. iranica showed growth of crab is isometric. The result of this study showed that the morphometric relationships are essential for effective protecting of this crab in freshwater spring of Eelood area.
    Keywords: Freshwater crab, Morphometry, Southern Iran, Sodhiana iranica
  • Zohre Moallem, Rahim Abdi, Abdolali Movahedinia, Solmaz Shirali, Amir Parviz Salati Pages 53-58
    Hilsa shad (Tenualosa ilisha) is an anadromous species which has reproductive migration from the Persian Gulf to the river. Morphological properties and histological changes in oocyte of Hilsa shad in two different environments (salt water and fresh water in Khuzestan province) were studied with respect to its reproductive cycle. Twenty fish samples with average weight of 830.75±3.25 gr, were collected from Bahmanshir (freshwater) and Musa creek (estuarine water). Following biometry (length and weight measurements), pieces of ovary of each fish were fixed in Bouin's fixative solution. Microscopic sections (5μm thickness) from paraffin embedded tissues were prepared and stained with Hematoxylin & Eosin, and then slides were studied under light microscopy. Results showed six phases as follows: chromatin nucleolus, perinucleolus, cortical alveolus, primary vitellogenesis, secondary vitellogenesis and third vitellogenesis were recognized in ovaries of T. ilisha. Three follicular layers such as theca, granulosa and zona radiata were clearly observed at the end of the vitellogenesis. The most oocyte diameters were also measured at the same phase. Ovarian follicles were at the same phase as in the ripe ovaries, indicating Hilsa shad is synchronous fish species in ovarian development. The changes observed in the pattern of oocyte development in T. ilisha was typical of the patterns described in most synchronous spawners studied to date.
    Keywords: Tenualosa ilisha, Ovary, Oogenesis, Anadromous
  • Huseyn Khayyami, Hossein Zolgharnein, Negin Salamat, Abdolali Movahedinia Pages 59-66
    Alimentary canal of fishes has a great variety of structural Peculiarities which are important in fisheries and biology. The aim of this study was to explain the anatomical and histological aspects of stomach and pyloric caeca in L. aurata, L. abu and M. cephalus (Mugilidae) from the Caspian Sea. Fifteen adult individuals of mugilidae; Liza aurata, L. abu and Mugil cephalus were collected from three fishing areas in the Caspian Sea, northwestern and the northeastern Persian Gulf. The length and diameter of stomach and the length, diameter and number of pyloric caeca were measured. L. aurata had larger stomach than L. abu. Anatomical and histological study showed stomach is U-shaped and gizzard like; it is divided into anterior cardiac and posterior pyloric portions, while pyloric caeca is a finger-like straight organ. In transverse section, the wall of the stomach and pyloric caeca is deeply folded with four layered general structure. Lenght and diameter of stomach showed strong correlation with standard length of specimens.
    Keywords: Morphology, Epithelium, Muscularis, Gizzard