نشریه بهره برداری و پرورش آبزیان
سال ششم شماره 1 (بهار 1396)

The Mesopotamian minnow (Barilius mesopotamicus Berg, 1932) is a native cyprinid which is distributed in Tigris and Bushehr basins in Iran and it is important from genetic point of view, but there is little information about that. The present study compared the geometric morphometrics of the Mesopotamian minnow populations in Iran. For this purpose, 460 fish specimens from its distributaion range in Iran, namely, Diala, Bushehr, Karkheh, Karun and Jarrahi river basins were sampled. Pictures were taken from the left side of the specimens and digitized using 15 landmarks placed on two-dimensional images using Tpsdig2 software. The data after Procrast analysis were analyzed with PCA, CVA multivariate statistical methods and cluster analysis. Geometric morphometric comparisons showed no significant differences in the studied populations, although in PCA and CVA tests and classification of the population and patterns of the body shape along the axes, some differences were observed which were due to differences in head size and shape, body height and length of the caudal peduncle. Thus, It seems that the separation time among these populations is not long enoght to result in substantial differences among them or their habit conditions are basically similar, leading to similar body shapes in different populations

In order to determine the optimal concentration of Ginger bioactive slurry ice, for short-term storage of Rainbow trout, four different concentrations of extracts (100, 200, 300 and 400 mg / L) and essential oil (500, 1000, 1500 and 2000 mg / L) were examined. To evaluate the integration effects of ginger bioactive compounds with ice slurry, ice slurry shelf life, substrate temperature and pH were measured. By using color measurement (L *, a *, b * and WI) and microbial analysis (TVC and PTC) the effect of Ginger bioactive ice slurry on the rainbow trout fillet was measured. the mentioned concentrations of essential oils and extracts, did not have any significant effect on the ice slurry shelf life, temperature and pH. Based on colorimetric tests, results showed that different treatments did not alter the color of the fillets. Ice slurry enriching with ginger extracts and essential oils, inhibits the total and psychrophic bacterial count. Total and psychrophic bacterial count of samples treated with the 200 mg / l ginger extract and 1500 g / l ginger oil was significantly less than other treatments. Based on performed tests, 200 mg / l extract and 1500 mg / l essential oil, were selected as the optimal concentrations of Ginger bioactive ice slurry.

Fish and pelagic fish inflorescence of the Caspian Sea is across the Caspian Sea and river estuaries leading to it is distributed. This species of high economic value, but because the sturgeon lie about nutrition is important. This study explores some biometric characteristics and has been counting these species off the coast of Salman Shahr. Samples were collected using hooks were studied in the laboratory. A total of 30 biometric features and characteristics of the measured count was 3. Based on the results, the mean weight of 7.506 grams, average total length 102.487 mm. In numerical characteristics inflorescence fish off the coast of Salman Shahr, the number of first dorsal fin rays 6 eggs. The slope of the regression line between the length and weight were 2.441, and the type of negative allometry was determined. Compared to other studies showed (Postdorsal length) the differences in the characteristics of memory which can be due to differences between fish habitat and and ecological conditions of the region.

Shrimp is one of the most important aquatic species in Iran. Considering the increasing trend in ýshrimp production, development of new value added products is increasingly required. The aim of ýthe present study was to produce a new canned product from shrimp (Metapenaeus affinis) as the ýraw material. Some variables including heating time, salt and vinegar concentrations as well as ýsterilizing time were optimized and their effect on the drained weight, fracture percent and fat ýcontent were determined. Drained weight was significantly decreased as a result of increasing the ýsalt concentration and sterilizing time (P0.05). Vinegar concentration and sterilization time had an important ýeffect on shrimp fracture (P0.05). Interaction of sterilizing time and sterilizing time change shrimp fat content (P0.05). It was concluded that first ýsterilization time and then heating process exert a great influence on the quality of the canned ýproduct.ý

In this study, bionanocomposite of myofibrillar protein-nanofibrillated cellulose (0.4 wt%) developed. In order to improve antimicrobial properties and reduce its sensitivity to water, different concentrations (1/5 and 2%) Oregano essential oil added in the biopolymer matrix. In this regard, physical, mechanical, optical properties and antimicrobial activity of different films were investigated. The presence of essential oils in biopolymer matrix reduced mechanical stability (p

Marine organisms represent a valuable source of nutraceuticals and functional compounds. On the other hand, large amount of underutilized by-products are generated from the seafood processing plants annually. Consequently, researchers have identified a number of bioactive compounds including bioactive peptides, collagen and gelatin, oligosaccharides, fatty acids, enzymes, calcium, water-soluble minerals, and biopolymers. Bioactive peptides derived from fish waste can be used as antihypertensive, antioxidative, anticoagulant, and antimicrobial components in functional foods or nutraceuticals and pharmaceuticals due to their therapeutic potential in the treatment or prevention of disease. In this regard, collagen and gelatin are currently used in diverse fields including food, cosmetic, and biomedical industries. Also, chitin, chitosan, and their derivatives possess biologically active polysaccharides and hence they are potential agents for many applications. Hence, seafood by-products are valuable natural resources that show range of functionalities and hence potential materials for biomedical and nutraceutical industries.

Due to the presence of heavy metals in the aquatic systems and disadvantages of the conventional techniques for the removal of them, lead to using of efficient methods for the removal of heavy metals. Biosorption of heavy metals using microalgae was considered as a suitable method. Scenedesmus sp. has suitable potential for the growing in the waste water and cadmium is more toxic even the low concentrations. So, In this study, efficiency of green algae Scenedesmus sp.was studied for the removal of cadmium from aqueous solutions. After growing of the algae in the Z8-N medium, live algae was used as absorbent. Different dosages (0, 0.25,0.5,0.75and 1) of algae were used for the different solutions (0,5,10,20 and 50 mg/L) at several contact times (0,30,60,120 and 180 Min.) to analysis of absorption of cadmium at the constant conditions (pH=6.8±0.1 and 27±2 ºC). According to the results of this study, optimum conditions of absorption of cadmium using Scenedesmus sp. Was conducted at a concentration of 10 mg/L (93.50%), contact time of 60 minutes (90.80%) and 1 gram absorbent (93.50%). Hence, comparing to other methods and absorbents, the application of Scenedesmus sp. for the removal of cadmium from aqueous solutions was very effective and it could be used for the removal of heavy metals from industrial effluents.