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  • Open Access Persian
    Authors: 
    Eshghi, S.; Imani, A.; Noori, F.; Agh, N.;

    This study was carried out to evaluate the effect of replacing Dunaliella salina algae by agricultural by-products (wheat bran, rice bran and wheat/rice bran) and probiotic bacteria Lactobacillus rhamnosus on digestive enzymes activity of Artemia franciscana in a 17-day period post hatch. The study was a 4×2 factorial experiment carried out as a completely randomized design trial consisting of different dietary treatments (combinations of various substitution levels of Dunaliella salina by wheat bran, rice bran and wheat/rice bran along with probiotic Lactobacillus rhamnosus). All treatments were performed in triplicates. At the end of the trial, digestive enzymes activity was assayed. The results revealed that Artemia fed wheat bran without any dietary probiotic supplementation showed significantly higher amylase activity (2.06±0.3μmol maltose mg protein-1 min-1 ) (p<0.05). Treatment fed Dunaliella salina algae and probiotic showed significantly higher alkaine protease activity (7.11±0.87 U mg protein-1 min-1 ) and those fed wheat/rice bran with probiotic had significantly higher lipase activity (0.09±0.005 mmol p-nitrophenol mg protein-1 min-1 ) (p<0.05). It was revealed that dietary probiotic inclusion resulted in decreased amylase activity whilst its effect on the alkaline protease and lipase activities were totally dependent upon the feed ingredients (e.g., simultaneous feeding of artemia by Dunaliella salina algae and probiotic led to higher alkaline protease activity, while receiving probiotic resulted in higher lipase activity in group fed wheat/rice bran). Our results also showed that digestive enzyme profile of Artemia franciscana was responsive to dietary treatment. Conclusively, using wheat/rice bran in artemia pond culture would result in inferior digestive enzymes activity especially alkaline protease and lipase with subsequent effects on nutrient digestion/absorption efficiency and undesirable effects on pond productivity and final product quality Published

  • Open Access Persian
    Authors: 
    Mosavi Dehmoedi, L.; Savari, A.; Dostshenas, B.; Mohamad Asgari, H.; Abassi, A.;

    Primary production is an important indicator of aquatic ecological systems. The spatial and temporal pattern of OPP is helpful for global climate change study. In this study the spatial and temporal variability of primary productivity in the 3 creeks of Northwest of Persian Gulf from Feb 2014 to Nov 2014 was estimated using a VGPM primary productivity model and insitu measurement. Single Peak of primary productivity appeared in April (0.356 gc/m2/d) and fall in July (0.217gc/m2/d). From the correlation analysis, we found that observed primary production has a good relationship with measured primary production (p<0.01,R2=0.60). A linear regression was then established to quantify the relationship between them. The RMSE of its function was good (0.3 mg/m3). In summary, the Landsat8 data are potentially capable of monitoring Case-II waters such as this creeks to some extent Published

  • Open Access Persian
    Authors: 
    Saiad Bourani, M.; Ghaninejad, D.;

    Mako reservoir which is situated on Zangmar River, located in western Azarbaijan province. It has an average area of 800 hectares. There isn't any fishing in Mako reservoir, and the purposes of construction were producing water supply for agriculture use and drinking water. The seasonal sampling were carried out in 5 stations by gillnet methods during 1998-1999. For catching the Capoeta capoeta, gillnet mesh size of 27mm was used. Capoeta capoeta was dominant species (90%) and Carassius aurata gibelio and rainbow trout had the lowest populations. Analysis on based Leslie and Delury methods showed that this reservoir has a range of 9.4-10.7 tons of Capoeta capoeta. By using Gulland method, the MSY estimated 4.5-4.8 tons. One year data collection and analyzing the data showed the average fork length were 23.9±4.3cm, mean weight of 162±68g and the mean age 2.6±0.68 years. Age composition showed that maximum and minimum frequency was in 3+ and 5+, respectively. Infinite length (L∞) and the growth coefficient (k) by using Walford formula computed 35.6 cm and 0.39 per year. Total mortality (Z) of this species determined 0.74. Natural and fishing mortality calculated 0.37 and 0.37, respectively. Published

  • Open Access Persian
    Authors: 
    Tahami, Mehri; Yavari, E.;

    Sea is one of the great resources of food stuffs, chemials and industrial material. Shrimp, Crab and Lobster having a good taste and Iots of protein are among the most saught after organism. Iran enjoys a vast expand of water bodies including Caspian Sea, Oman Sea and Persian Gulf coasts as well as inland waters. Every year a large quantity of aquatic organisms are being captured in Iran. Chitin is the second most important polysaccharide found in by - products after cellulose, This compound is easily extracted within two stages of demineralization anti deproteinzation with 10 - 30% efficiency. Chitin is being used in textiles, paper mills and medical industries to manurufactture better quality good. In photography, food industries, pharmcology, chromatography and agricultre, chitin has a very important usage. Chitin is the primary material for synth its of chitosan and glucosamine, both of which have industrial, chemical and pharmaceutical usage. Up to now, more than 300 uses. have been reported for chitin in the literature. Published