مجله علوم و فنون دریایی
سال چهاردهم شماره 1 (بهار 1394)

The Brown banded Bamboo shark is a benthic shark and unlike most of shark, to attract the oxygen in the water no need to move constantly. In this investigation, 36 individual of Brown banded Bamboo sharks (Chiloscyllium punctatum) were caught from Dervish's Creek in the northern Persian Gulf. Certain sections of the gill tissue removed and immediately fixed in Bouin’s solution. Then embedded the samples in paraffin and sectioned into 5 micrometer microscopic and stained with hematoxylin and eosin. In order to evaluate the comprehensive, sagittal and cross-section of gill tissue were studied. Microscopic results of cross-section indicated that the gill tissue structures including, filaments and lamella sections revealed. In addition, a variety of cells such as columnar cells and chloride cells (MR) were also detected. According to the results obtained for the cross section, The cell aggregates, named follicularlyarranged NKA-rich cells (follicular NRCs), were found in the gills septum. Therefore, the Brown banded Bamboo shark has three types of NKA-rich cells in the gill: (1) NKA-rich MR cells on the filament and lamella, (2) NKA-rich solitary cells (solitary NRCs) and (3) follicular NRCs on the gill septum.

Filtration in bivalves is the most important physiological and biological activities that can redound absorption of environmental contaminations. Since Saccostrea cucullata and Barbatia hellbingii are well distributed in Bushehr coasts, this investigation is carried out to evaluate the potential of these species to filtrate more chlorella volgaris algae. The filtration rate of the Saccostrea cucullata and Barbatia hellbingii were measured at 25 °C and 36 ppt in the laboratory using concentration of chlorella volgaris. Results showed filtration rate of Saccostrea cucullata and Barbatia hellbingii were 29.3683 ± 0.46212 and 31.1453 ± 0.66055, respectively. There was a significant difference between mean filtration rates with the two treatments (P < 0.05), and Barbatia hellbingii showed higher filtration rate in experimental condition, so it can be suggested Barbatia hellbingii as a better biomonitor.

In this study, the capacity of Siberian sturgeon, Acipenser baerii with mean weight 19.3±0.4 g to face short-term starvation and subsequent re-feeding was assessed for a 40-day period. To investigate, the effect of compensatory growth on some physiological response (plasma cortisol, thyroid hormones, glucose, protein, cholesterol and triglyceride) and morphological (total body weight and length, condition factor, hepato-somatic index, vicero-somatic index and digestive-somatic index) in Siberian sturgeon four different feeding regimes were established. Control group fed four times daily to apparent satiation; SRF1: 2 days starvation and 8 days refeeding; SRF2: 4 days starvation and 16 days refeeding; SRF3: 8 days starvation and 32 days refeeding were experienced. At the end of experiment, blood samples were collected to analyze biochemical parameters. Plasma cortisol and thyroxin (T4) hormones levels were not significantly different between control and food deprived groups at the end of experiment (P>0.05) but plasma tri-iodothyronin (T3) levels were lower in the starved groups compared to control animals, but this decreases only in S1 group was significant (P<0.05). There were no significant difference in measured metabolites levels between control and food deprived groups (P>0.05). Moreover, at the measured morphometric indices were not observed significantly different between the control and starved groups (P>0.05). The results suggest that Siberian sturgeon has the physiologic and metabolic adjustment ability to short-term starvation and return to basal level after re-feeding.

The order Zoantharia (Zoanthids) is one of the most neglected orders of Cnidarians in the Persian Gulf. The present study aims to investigate the biodiversity of this order with morphological and molecular examination in Hormoz Island. For this purpose 34 colonies of zoanthids with variety of shape and colors have been collected of intertidal and shallow water region of Hormoz Island. After sampling, morphological characteristic of each specimen were recorded based in situ photographs. Then DNA was extracted using the CTAB- Chloroform method and mt 16s rDNA gene fragment was amplified and sequenced. The results of preliminary morphological identification integrated with mitochondrial marker sequencing demonstrated the presence of at least three different species in Hormoz Island; Zoanthus sansibaricus, Palythoa cf. mutuki and Palythoa tuberculosa. Although at first sight, morphological characteristics were not successful to identify zoanthid to the species level, after molecular identification they establish as reliable criteria to identify and delineate species.

The purpose of this study was to evaluate the antioxidant properties of hydroalchoholic extractions of three species of green, brown and red algae. The highest and the lowest total phenol contents was in L. snyderia (113/9±0/69 mg gallic acid per gram of extract) and the green algae E. intestinalis (72/36±6/05 mg gallic acid per gram of extract) respectively. The highest values of total flavonoid was founded in the red algae L. snyderia (41/05±1/95 mg Rutin per gram of extract) however, the lowest values was (12/7±0/41 mg Rutin per gram of extract) in the brown alga C. trinodis. L. snyderia showed the most antioxidant activity, and C. trinodis had lowest amounts of antioxidant potential by the radical, azinobis ethylen benz thiazoline sulphonic acid (ABTS) test. there were significant differences between anti-oxidant activities of algae according the ABTS test.

Esox lucius Linnaeus1758 is one of the economically valuable species of Caspian Sea. Genetic diversity of marine resources is of vital important in their management and protection.; seven microsatellite loci were used to investigate the genetic variation of 60 samples of Esox in Amir and Anzali wetlands of Gilan. Results showed conspicuous genetic variation in regions using Fst, AMOVA and a relatively high level of gene flow was found among populations.The average observed and expected heterozygosity was 0.626 and 0.662 respectively. Assessment of Hardy-Weinberg equilibrium showed that all samples of studied showed significant deviations from Hardy-Weinberg equilibrium (p ≤ 0.05).There were evidences for genetic bottleneck in the populations. Cluster and molecular variance analysis showed two completely distinct population in these wetlands, and this subject must be considered by fishery organization to resource management of this species.

Natural antioxidants are more safe and healthy than synthetics antioxidants. The natural antioxidants aren’t limited to terrestrial sources. It’s documented that marine seaweeds are a rich source of natural antioxidant components. In this study, the antioxidant potential of two species namely Chaetomorpha sp and Colpomenia sinuosa and effect of different solvents on antioxidant compounds extraction were studied. The algal materials were extracted by conventional solvent extraction during 24 hours in room temperature (26-28) using acetone, ethanol, methanol (30/70%) and water (100). Total phenolic contents, ferric reducing power, DPPH radical scavenging activity and total antioxidant capacity were measured in different extracts. The data showed acetone extracts have more potential to extraction antioxidant and polyphenolic compounds in comparison with other treatments. Also, it’s revealed that Chaetomorpha sp had the highest phenolic contents, ferric reducing power and total antioxidant capacity but lower radical scavenging activity than Colpomenia sinuosa. The difference in antioxidant compounds extraction can be related to the solvents type, target compounds and algal species. These algae can be applied in food and pharmaceutical industries as natural antioxidants sources.

In the mean time the performance of transit could be increased through identifying the barriares and effective elemnts of transit cargo attracting.It is the the purpose of the present paper to identify and select the most effective indicies in transit industry at ports. To do this, all of the possible factors and bottlenecks in a transit process are uncovered through library research, interviews and Delfi technics. Then they are categorised based on the three models of fish bone model, type of indices as well as quantity and qualities of indecies. In order to find out wheather each associated factors has an affect on the transit process or not, the binominal test is applied. To do this, a five point likert scale quationer form consist of 27 items was distributed among 16 transit experts. Analysis is done through SPSS softwere.The result indicates that factors such as advertising in shipping line attracting, 24 hourse a day, seven days a week services and having cargo-handling geras with high capacity are observed as non effective factors in transit industry while economic/ prices stability and effective multy modal connectivity at ports (road, railway, aviation..) are considered as effective factors in transit industry. Finnaly, along with the investigation of transit issues at north port of Iran, some identified indices such as port time, vessel throughput and berth throughput are scrutnized at Anzali port as a case study.

Synthesis of metallic nanoparticles using biological methods is more efficient and eco-friendly than chemical methods. In this study, we have investigated extracellular biosynthesis of silver nanoparticles using Sargassum anustifolium extract. The results recorded from UV–Vis spectrum, transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR) support the biosynthesis and characterization of silver nanoparticles using this seaweed. After adding silver nitrate to Sargassum anustifolium extract, the brownish yellow color in mixture turned in to dark brown color over time. The maximum peak absorption of synthesized silver nanoparticles was observed at 406 nm indicating the reduction of silver ions and formation of silver nanoparticles. The synthesized silver nanoparticles were predominately spherical shape and 32.54 nm size. According to the FT-IR analysis, the responsible compounds for reduction of silver ions into silver nanoparticles are phytochemical compounds of this seaweed.