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      • Open Access Article

        1 - جداسازی و ارزیابی فعالیت برخی از باکتریهای شاخص اکسید کننده آمونیاک، نیتریت و نیترات از مزارع پرورش ماهیان گرمابی در استان مازندران
        رضا صفری دکتر محمد رضا سعیدی اصل زهرا یعقوب زاده
      • Open Access Article

        2 - Relationship between some physic-chemical characteristics of the water with different densities of warm water culture fishes
        zeid ahmadi
        This study investigated the relationship between some physic-chemical characteristics of the water ponds with different density of warm water culture fishes. We selected 10 fish ponds with different densities of warm water culture fishes, including densities of 2200, 24 More
        This study investigated the relationship between some physic-chemical characteristics of the water ponds with different density of warm water culture fishes. We selected 10 fish ponds with different densities of warm water culture fishes, including densities of 2200, 2400, 2600, 2920 and 2950 (part of a hectare). Water characteristics such as Nitrite, pH, Ammonium, Phosphorus, Dissolved Oxygen, Salinity, Ammonia Nitrate, Transparency and Alkalinity were measured. These parameters were estimated by standard methods. One way ANOVA of data showed significant difference between the different densities in most water quality parameters, there was no significant difference between the mean phosphorus, salinity, hardness, transparency and ammonium concentrations. Based on these results, the density had effect on water parameters. Manuscript profile
      • Open Access Article

        3 - Breeding marine fish in fish farms with emphasis on sea carp (Cyprinus carpio Linnaeus 1758)
        Abdollah Haghpanah
        This research is aimed at obtaining technology, increasing production and profitability, promoting and diversifying in tropical fish farms, as well as breeding and breeding marine fish far from the sea coast, in order to release the fry into the sea, in order to increas More
        This research is aimed at obtaining technology, increasing production and profitability, promoting and diversifying in tropical fish farms, as well as breeding and breeding marine fish far from the sea coast, in order to release the fry into the sea, in order to increase productivity and increase the stocks of this fish. The improvement of the living conditions of the fishermen was done. Sea carp breeding was carried out as a single species and in the same density format with 1400 pieces with an average weight of 42.46 ± 0.05 in 3 pools with an area of 0.5 hectares in tropical fish farms. The required fry were supplied from the Voshemgir dam center and released in breeding ponds. From the beginning of the breeding period, they were fed with natural food and farmed carp concentrate at the rate of 5-10% of their body weight. At the end of the breeding period, the average weight of this fish was 722.49 ± 0.10, the average daily growth was 3.44, the value of the food conversion coefficient was 2.30, and its survival rate was 85.83%, which indicates the adaptability of this species to the conditions The climate and breeding farms of this province and its breeding and production in the areas far from the sea shores are single-species and together with tropical fishes. For this reason, breeding of this species in order to increase the production and profitability of the aquaculture industry, as well as its production and reproduction in order to improve the stocks of this species in the sea, it can be suggested to breed it in tropical fish farms in the province. Manuscript profile