The aim of present study was to assess the susceptibility of vacuum packaging in prevention of microbial contamination of packaged fish fillets at Ahvaz market. In order to evaluate the microbial contamination of commercial shrimps at Ahvaz market, 8 common species has been used as follow: Penaeus semisulcatus, Penaeus indicus, Penaeus farfante, Penulirus homarus, Penaeus merguiensis, Parapenaopsis stylifra, Metapenaeus affinis, and Litopenaeus vanamei. For Identification of microbial contamination of sampled shrimps, the muscle tissue has been observed. Two bacterial family (Vibrionaceae and Streptococcaceae) including 2 genus and 3 species has been identified. The most abundant species was Streptococcus faecalis with frequency of 61.5% and the lowest frequent species was Vibrio alginolyticus (7.7%). No bacterial contamination has been detected in Penulirus homarus and Metapenaeus affinis. Penaeus farfante with the 4.5×10³ contamination of Vibrio parahaemolyticus was the most contaminated species. In study of organs for detection of fungi, Penicillium expansum from Phylum Ascomycota, Family of Trichocomaceae has been detected. Due to the contamination of of studied specimens it should be noted that precise and continuous monitoring of possible pathogenicity of V. parahaemolyticus in order to evaluate the health risk of consuming sea food would be necessary. 

The global demand for plastics is increasing due to it wide applications. About 60 to 80 percent of the waste of the marine environment belong to plastic class. There is a lack of information and research on the presence of plastic and micro-plastic contamination in aquatic animals, The present study, therefore examined the frequency, distribution, size, color and type of micro-plastic (MP_S) in the gastrointestinal tract of 5 species (n =10) from the coasts of the Chabahar Bay, the Oman Sea in spring, 96. The total number of MP_S found in the studied species varied and highest percentage of MP_S in the gastrointestinal tract of the fish belonged to fiber (55%), fragments (26%) and pellets (18%). The results of the Fourier transform infrared spectroscopy (FT-IR) analysis from suspect samples were shown the microplastic samples were found. The most commonly detected polymers were polyethylene (PE), polyethylene terephthalate (PET) and nylon. The results showed that all fish sampled from Chabahar Bay contained MP_S. Considering the importance of MP_S pollution, it can be suggested by studying this contamination By monitoring the release of plastics on the shores of tourism and fishing in the Chabahar of bay, as a subject of future studies.

This research was conducted in autumn and winter 2016 in Shahid Motahary Coldwater Fishes Genetic and Breeding Research Center. In this study, comparison of Perfish solution efficiency with malachite green and formalin on fungal contamination control of rainbow trout (Oncorhynchus mykiss) eggs in incubation stage was done. For this porpuse the California incubators (20 × 35 × 30 cm) with depth of 20 cm, the height of water on the egg, 10 cm and water flow rate 4 to 6 liters per minute were used. Then the number of 700 fertilized eggs transported to each incubator tray. In this study, 9 treatments (perfish 15, 37, 75, 150, 300 ppm; malachite 2ppm; formalin 1000ppm; positive control and negative control) were tested with 3 replications. The highest Percentage of Eyed eggs in treatment of green malachite, formalin and perfish 75 ppm were observed respectively with 69.38±1.94, 64.99±8.05 and 63.76±4.72. The highest of hatching rate were observed in treatment of perfish 75 ppm (95.8±.6). Treatments of formalin and perfish 15 were showed the lowest (3.33±1.15) and highest (5.33±2.08) of larva deformity respectively, without the Significant difference among the experimental treatments. Finally the results showed that the best and more effective dose of Perfish was 75ppm in 30 min. furthermore with involving all aspects Perfish solution is a suitable new compound for the prevention of fungal contamination during the incubation period of Rainbow trout eyed eggs.

Reservoirs are artificial lakes that have been created by humans for specific purposes. Water reservoirs has different uses which the most important are: municipal water supply, agricultural irrigation, aquaculture, power generation and etc. According to increasing of water demand the accurate study of water resources, determination of their pollutants, prevention, pollution control and optimal use of available water resources are required. Saymareh Dam is located about 40 km northwest of DARREH SHAHR in ILAM province. This dam was constructed with the aim of producing electric power, controlling and regulating of river floods. The aim of this study was to survey on the bacterial contamination of Seymareh Reservoir and its relationship to some water physical and chemical factors. According to the geographical and hydrological status of the reservoir, five stations (one station near the water entrance to the lake, 3 stations at the beginning of the lake, middle and near the crown, and one station after the reservoir) were sampled 8 months in 3 seasons of year for bacteriological, physical and chemical evaluation. Water quality standards for microbiological sampling were used. Then microbial tests including total bacterial count, total coliform count, fecal coliform and fecal streptococcus count were performed. In each station simultaneous measurements of some physical and chemical parameters of water (temperature, dissolved oxygen and pH) were also evaluated. The results showed that the highest total bacteria counted during sampling at station 5 (after reservoir) and the lowest rate at station 4 (before the reservoir's crown). Also the average of total and fecal coliform was the highest at station 5 in all sampling seasons and the lowest in station 2. The stations grouping in this three indices showed that the entrance and outlet stations of the reservoir (1 and 5) are in the same group and the stations located on the reservoir (2, 3 and 4) are in the other group that showed a significant difference (p<0.05).In the Pearson test, correlation between water temperature and pH changes with the number of total bacteria and fecal coliform was positive and with the total coliform was negative, while dissolved oxygen showed a negative correlation with three bacterial indexes. In comparison to the bacterial parameters with available aquaculture standards, the water of this reservoir is suitable for fish production in all seasons.