مجله علوم و فنون دریایی
سال نهم شماره 3 (پاییز 1389)

A feeding trial was conducted in order to evaluate the effects of dietary nucleotides at levels 0, 0.1, 0.2,0.3 and 0.4% on blood biochemical and haematological parameters of common carp (Cyprinus carpio). Experimental diets were fed to the juvenile fish (7.54±0.2g) for a period of 8 weeks. The experiment was carried out in triplicates in 300l tanks each containing 20 fish and fed five times a day to satiation.Results of this study showed that the addition of dietary nucleotide led to significant increase in blood biochemical parameters including glucose, total protein, albumin and triglyceride contents (p<0.05), whereas no significant difference was observed in total cholesterol (p>0.05). Haematological parameters including Hb and HCT in fish fed dietary nucleotide were significantly higher. There were no significant differences in WBC and MCHC between the treatments (p>0.05). Also no significant difference was observed in fianl weight gain among the treatments. Our results indicated that dietary nucleotide could, to certain extent, affect physiological responses in common carp.

The effect of different levels of protein on the growth performance of juvenile Beluga was studied using five semi – purified, isolipid (11.5 ± 0.71%) diets containing 20, 25, 30, 35 and 40 % protein (D1 to D5). This experiment was conducted for 8 weeks duration in order to ascertain the optimum level of protein requirements for experimental juvenile Beluga (40 ± 2.29g). Two – hundred and twenty five fishes were randomly distributed between 500L fiberglass tanks, filled with 400L of freshwater. Fish performance in the terms of WG, SGR, FCR and survival rate were best and significantly different(P<0.05) at 35 and 40% protein levels (D4 and D5). However, protein efficiency ratio (PER) was best in the diet D4 with 35% protein level. Growth performance was poor in D1 and D2 at 20 and 25% protein levels (P<0.05). Body composition improved with increasing protein levels. In diets D3, D4 and D5 significantly (P<0.05) higher protein and lipid deposition with lower moisture and ash content were observed. This study indicated that a minimum level of 35% protein is required for optimum growth in Beluga.

This study is a result of activities and research carried out during May–September, 2003. One breeder group of Whiskered Tern (Chlidonias hybridus) (930 pairs) in Zarrinkola Ab-bandan and two breeder group (1390 pairs) in Marzoonabad Ab- bandan were investigated. Floating nests were made on the Nymphae alba. Some of the important factors of nest selection on the basis of observations and measurements were nest size, water depth around the nest and nest distance from the nearest nest for determination of habitat suitability and their division to different categories. The maximum nest length, nest width and nest cup length in Zarrinkola Ab-bandan were 36.06±13.65, 34.53±12.89 and 10.32±1.57cm, respectively. The maximum nest thickness of water level, nest cup depth and water depth in the first breeder group of marzoonabad Ab-bandan were 3.85±0.46, 1.75±0.31 and 186.33±7.06 cm, respectively. The maximum distance of neighbor nest in second breeder group in marzoonabad Ab-bandan was 4.16±3.32 m. There was no significant difference between breeding success with nest size (p=0.711, p=0.266, p=0.200), water depth (p= 0.070, p=0.777, p=0.103) and distance of neighbor nest (p=0.851, p=0.050, p=0.502) in Zarrinkola, first and second breeder group of Marzoonabad Ab-bandans, respectively.

Listeria is a voluntary intracellular gram positive bacterium. Listeria monocytogenes is a pathogen bacterium that redound acute Listeriosis in human and animals. Listeria monocytogenes is the most widespread bacteria causing meningitis. Listeria monocytogenes transmission is by unclean food, cheese, raw vegetables, salad and fish. The total colony count was used in this study as one of the microbial quality control methods. In total 260 fresh fish including 160 rainbow trout (cold water fish) and 100 common carp (warm water fish), were collected from fish markets in Kermanshah city. All the samples were tested for presence of Listeria monocytogenes using the modified Canadian version of U.S. Food and Drug Administration (FDA) Listeria isolation method and total colony count. The statistical analysis of data were done by descriptive statistics. The incidence of Listeria monocytogenes in the retail market was 15% in rainbow trout and 18% in common carp. The total colony count were more than 107 (cfu/gr) in 35% of rainbow trout and 48% of common carp. Based on the results, the hygienic procedures in fish marketing and consumption, such as evisceration of the fish and sufficient cooking are recommendable.

Heavy metals are persistent which could enter aquatic food chain and cause different problems both for aquatic organisms and human being after they release in to the ecosystems. Sediment is the final destination for heavy metals in aquatic systems in which they accumulate. Determination of heavy metals concentration and distribution in the sediment compared to available standards could serve as indication of heavy metal pollution in the environment. In order to estimate the level of heavy metal concentration in the sediment of intertidal zone of Bahrakan shore, sediment samples were collected from 5 different stations during low tide from Summer 2007 to Spring 2008. Samples were transferred to the laboratory, acid-digested and their concentrations were determined using atomic absorption spectrophotometer Unicam model 919. The patterns of metal concentrations in the sediment was: Pb>Cu>Cd. Mean Cu concentration in the sediment was 21.54 - 23.77, 20.93 – 22.80, 22.48 – 24.04, 21.54 – 23.73µg/g for summer, autumn, winter and spring seasons, respectively. Mean Pb concentration in the sediment ranged between 41.70 – 57.06 µg/g in summer, 37.61 – 48.53 µg/g in autumn, 55.36 – 63.89 µg/g in winter and 46.82 – 58.77 µg/g in spring seasons. Similarly Cd concentration in the sediment was 1.85 to 2.18, 1.72 to 2.08, 2 to 2.32 and 1.85 to 2.04 µg/g in the four seasons, respectively. Heavy metal concentration in sediment was the highest in winter. The station located at the Zohreh river mouth was found to be more contaminated than others. Metal concentrations in the sediment were found to be higher than some available standards and seem to be of anthropogenic origin. Since population and industrial development are increasing in this valuable fishery area, regular monitoring of pollution in the area is recommended.

One of the most important issues that container terminal operators are seeking to address is how to effectively handle thousands of import, export, and transit containers in their container yards. The time that port operators spend at a container terminal for loading and/or unloading of containerized cargo is a real cost scenario which affects not only the smooth operation of ports, but also the overall cost of the container trade. To evaluate the benefits of smoothing container handling operations and port efficiency, this paper introduces the Multiple Attribute Decision-Making (MADM) and the Fuzzy Analytical Hierarchy Process (FAHP) models to provide a concrete basis for such an evaluation. The main objective of this paper was to select the best yard gantry crane among RTGs, SCs, and RMGs for handling containers in the landside of container terminal of the Shahid Rajaee Port Complex, the main Iranian container terminal.

Sedimentation in navigation channels is a major problem faced by any port authority. In this research, based on the field data on current, tide, and wave at five stations, the sedimentation rate has been predicted in the KHOWR-E- MUSA channel by using Sediment Transport models. Based on the hydrographic maps and dredging volume the sedimentation rate in the access channel was (0.000076). Comparison of sedimentation rate models and the observed sedimentation rate, computes non-dimensional coefficient of for Biker’s model, for Van Rijn’s model and for Watanabe’s model indicating accuracy. Results showed that sediment particles are fine.

This study was carried out on artificial reefs of Bahrakan coastal water (Khozestan, Northwest Persian Gulf) seasonally from May 2009 to February 2010. The samples were collected by SCUBA divers at depth of 12m using random quadrate (0.25×0.25m) technique.. Four sampling station were selected one at the old reefs (D) and three were located at the new reefs (A,B and C).The samples were fixed in 90% ethanol and transformed to lab. Then, the samples were weighed biomass of sponges in different season calculated and indeces of diversity and richness was estimated for each species. In general, the highest diversity was recorded at station D in winter. Result of PCA analysis also has indicated variation in diversity at different stations and these result were confirmed by Bray-curtis index.