نشریه زیست شناسی دریا
سال ششم شماره 4 (پیاپی 24، زمستان 1393)

This study conducted to achieve some morphological characteristics of Mudskipper fish (Scartelaos tenuis) in the Pozm Gulf (Chabahar) and Dargahan Port (Qeshm Island). 82 Samples were collected during March 2008 to April 2008 by Active fishing (48 samples from Pozm Bay and 34 ones from Dargahan Port). In this study measured 26 morphological attribute and 5 numeric attribute, were counted in the waters of the Pozm Gulf and Dargahan Port. The regression model between total length and body weight obtained for Pozm Bay and Dargahan. (W=0.0091L2.859 with a correlation coefficient about 0.97 and W=0.0091L2.695 with a correlation coefficient about 0.98, respectively). In addition, the mean condition factor and standard deviation for Pozm Gulf and Dargahan Port was 0.34 ± 0.05 and 0.45 ± 0.07 respectively. According to the results in Pozm Gulf the largest sample was 13.53 cm and 7.40 grams and in Dargahan port was 17.20 cm and 15 grams.

Biosorption is an effective technology for optimal removal of pollutants such as heavy metals from marine ecosystems. In the present study, the microorganism, resisted to zinc, was isolated from Persian Gulf sediments and indentified via biochemical tests. Then, the growth ability of indentified microorganism was investigated in different concentrations of zinc. Also, the effect of salinity on the growth of microorganism was studied and the optimal conditions for its growth were determined. Pseudomonas sp. was isolated as a zinc-resistant bacterium and identified using biochemical tests and bacteriologic references. The mentioned bacterium was able to grow up to a high concentration of zinc (320 mg/l) and the increase in zinc concentration in environment caused the bacterium growth to decrease. The maximum bacterium growth in 20 mg/L of this metal was measured to be 0.87. With the increase in concentration of this metal to 320 mg/L in environment, the bacterium growth decreased to 0.4 which shows the significant difference with the maximum bacterium growth in 20 mg/L concentration of zinc metal (p≤0.05). The optimum temperature was 25 °C for this bacterium and its maximum growth was significantly different in 15 °C and 45 °C (P ≤ 0.05). The results of halophile test also showed that this bacterium is halotolerant. Bacterial growth increased by increasing salt concentration from 0 to 4%, but when salt concentration reaches to 6, 8 and 10%, it decreased significantly.

Sea anemones (order Actiniaria) are groups of marine aquatic that most its species are habitant in tropical reefs. This study was conducted in October 2013. The purpose of this study was extractiing of DNA for to do molecular studies from sea anemone of Anemonia sp. PG specie from Persian Gulf and checking the Problems resulting from the extraction of DND. In this research the isolation of DNA performed using the CTAB method from the sea anemone of specie Anemonia sp. PG that had associated with the changes in the standard extraction protocol and its optimization and finally, large amounts of purified DNA and quality and free from any contamination obtained, such as polysaccharides (Muccopolysaccharides), which can be used for a variety of molecular analysis. The results of agarose gel electrophoresis, spectrophotometer and partial sequencing of the genome was represented the good quality of extracted DNA from the sea anemone Anemonia sp. PG. The advantages of this method are its simplicity, low cost, avoiding the symbiotic genome extraction of anemone and also removal of mucopolysaccharides contaminants that many of standard biochemical methods for the isolation of nucleic acids in some marine organisms, such as members of hydrozoans are not effective due to these contaminations.

This study was conducted to provide a detailed osteological description of Faridpaki spined loach, Cobitis faridpaki and comparing it with that of C. taenia. Recently, C. faridpaki was described from Siahrud River (southern Caspian Sea basin). The results of the present study provide some information about biological features this native and recently introduced species as well as more robust identification features, i.e. osteological ones. For this purpose, 20 specimens of Faridpaki spined loach were collected from Siahrud River by electrofishing and cleared and stained with alizarin red S and alcian blue for osteological examinations. Then, detailed osteological features of this species was provided. The results showed differences in the structure of the maxillary, premaxillary, pectoral girdle and anterior part of the neurocranium with those of C. taenia that can be considered as special features of fridpaki spined loach.

This study was done in Shahid Kiani Marine Aquaculture Development Center, Choebde, Abadan in order to evaluate the effects of Pediiococcus acidilactici, Lactococcus lactis and vitamin C on water quality parameters and carcass composition of L. vannamei during three months. Treatments were included control group, Pediiococcus and Lactococcus treatments which fed with diet containing 1×109 cfu g_1 bacteria and vitamin C. The results indicated that these supplements cannot cause to significant impacts on water quality parameters (P˃0.05). The lowest of crude fat and the highest amount of ash were computed in Pediococcus and Lactococcus treatments (P

Study on morphometric characteristics of Otolith in Lactarius lactarius of the Persian Gulf were examined in this research. Sampling lasted from September 2011 to December 2012. During this period 42 specimens were cut and studied. Trawling time was 2-2½ hours and trawling depth was considered as 10-100 m daily. Catching operations was done within 24 hours. Sampling was done in Khouzestan and Bushehr waters. All the otoliths were extracted to verify them. Investigation of otolith morphometric characteristics (length, breadth, weight, perimeter and area) were conducted. The length-weight relationships showed that the growth pattern was isometric.

Changes in levels of cortisol, glucose, Na, Cl-, K ions, muscle water content, the size and number of gill chloride cells as well as mortality percentage of Convict Cichlid (Cichlasoma nigrofasciatum) with mean weight of 3.70±0.93 g were investigated under various salinities (fresh water, 10 and 20 gl-1) and temperatures (20, 25 and 35 °C) for 60 days. Sampling was done at the beginning of the test, and the days of 30 and 60 after the test. Cortisol, glucose, Na, Cl-, K ions, the size and number of gill chloride cells were increased after 30 days of the test and the maximum levels were obtained in 20 gl-1 at 20 °C on day 30 of the test. Muscle water content were decrease after 30 days of the test and the minimum level was obtained in 20 gl-1 at 20 °C on 30 days of the test. Mortality percentage was increased after 30 days of the test and reached the maximum level in 20 gl-1 at 20 °C on 30 days of the test. All of the fish were died until the end of the experiment. Based on obtained results, it seems that the salinity more than 10 g -l and temperature lower than 25 oC is not suitable for rearing of Convict Cichlid.

The present study was done for evaluation of the effects of different cooking methods (boiling, steaming and frying) on arsenic and mercury content of Indian shrimp (Fenneropenaeus indicus). Wet digestion method and atomic absorption spectrophotometer was used in order to extract and determine arsenic and mercury residue in experimental samples. The mean recovery rate was 90.6 and 102% for mercury and arsenic, respectively. Mean concentrations of arsenic and mercury in raw shrimp samples was 237.67±27.01 and 115.67±16.86 µg/kg, respectively. The results of this study revealed that arsenic concentration in fried shrimp samples with average of 459.42±63.66 µg/kg was increased which was statistically significant (P