The study and feasibility of Cheshmeh-Ali River and downstream area of Shahid Shah-Charaghy dam in Damghan for aquaculture development

To reveal the fisheries productivity and to get the maximum possible exploitations of the running water resources, existing potentials for aquaculture in Shit and Kordabad rivers in Tarom of Zanjan province were surveyed in a one year round study. In this way 4 and 3 sampling site were respectively selected in Shit and Kordabad rivers and benthic macroinvertebrates and water samples were collected and analyzed at least two times a season and fish fauna were also sampled and studied only two times during the period. All the measured water quality characteristics(such as O_2, water temperature, pH, nutrients, NH_3, BOD_5 and . . . ) were within the normal range suggested for the cold water fish culture. In both rivers no significant differences (p≤95%) were detected for physicochemical parameters within the study sites except for electrical conductivity and total hardness which differed in the firs and last station. Depletion of Agricultural run off and residual from the adjacent farmlands and municipal drainages into the water body of the rivers, were certainly effective in these changes However none of water quality parameters exceed the maximum permitted level for aquaculture. According to the benthic macroinvertebrates study 38 family of 12 taxa and 26 family of the 11 taxa were identified in Shit and Kordabad rivers respectively, most of them belonged to the aquatic insect larvae of the sensitive groups. Community structure indices and Hilsenhof family level biotic index proved a "very good" to "good" water quality criteria for the study sites in both rivers .One fish species in Shit and five species (4 of them were endemic) were identified in Kordabad river. Despite acceptable water quality in Shit river, some inhibiting factors such as adjacent farmlands and dense agricultural land use, high slope of river valley in most region which cause rare suitable lands for locating aquaculture sites, very limited access to road and electricity supply and lack of acceptability to manipulate or divert river water for fish farms, by the local people, are the major constrains for constructing trout farms in Shit river. However constructing a 15 mt capacity rainbow trout farm is possible at first 2 kilometers of the upstream where the water quality and quantity are relatively better and there are some lands with low slope and access to road and electricity supply. Kordabad river has a similar criteria and water quality and quantity at upstream is desirable for rainbow trout culture. The first 2 kilometer of this river is capable of constructing trout farms in some non cultivated lands. Moreover the Kordabad natural dam reservoir is available to conduct its water for further demands. In addition a total of 75mt rainbow trout production in the form of 2 or 3 separate site is possible in this river. Even though the local climate particularly in Kordabad river is acceptable for carp fishes, however land limitations, soil texture and the high volume of water demands, make warm water fishes commercial production impossible

Survey on health and disease status of ornamental fishes in Golestan, Mazanderan and Khorasan Razavi provinces

The project of survey on health status of ornamental fishes in Mazenderan , Golestan and Khorasan Razavi carried out with association of 5 , 2 and 6 centers in orderly. The main aims of this survey were identification and distribution local infectious of epizootic diseases, identification positive and negative points, offers management applicable guidelines to prevent of diseases.The results of survey showed that important virologically agent identified was Lymphocystis virus in Angel fish. Also, main bacteriologically agents were Aeromonas spp, Pseudomonas spp and vibrio. As well as, from the fungal agents that were identified can mentioned to Aspergilus flavus, Mucor, Penicilium and Alternaria. The important parasitic agents also were Trichodina, Ichthyophytrius, tetrahymena, Dactylogyrus, Gyrodactylus and capillaria. In the health management part of this survey positive points include non-application of antibiotic and cooperative of hatchery directors with executive organizations to sampling examination periodically. The negative points were non familiarity and training about fish disease, were not technical director, prepairing feeds without familiarity with principals of diets, non-quarantine units before fishes entrance to production cycles, non existens good food storage rooms, non existens foot bath in entrance gate to the hatchery systems and ets

The feasibility study for culture of Salmo trutta caspius by brackish water

Caspian trout is valuable, Commercial, anadromous and endemic fish species in the Caspian Sea so that, researchers attention have been focused on this species. At the moment, only pay attention to stocks rehabilitation that fisheries organization releases more than 300,000 fingerlings to the rivers ends to the Caspian Sea. Importance of this study consist (1) introducing a new species to the aquaculture system and (2) provide breeders in this research. we used from 2 treatments that consist with density of 10 kg/m^3 and 20 kg/m3 with 3 replication. Results showed, culture of Caspian trout is suitable with density 10 kg/m^3, so that weight gain, SGR and Daily growth mean are better than treatment 2(15-20 kg/m^3