Following the previous planning and after making the necessary arrangements with the head of the Organization of Agriculture - Jahad - Ramsar, Mr. Behrooz Bahramian, the certain researcher of the Coldwater Fishes Research Center of Tonekabon, along with Ms. Ghahari, the head of the fisheries extension department, and Mr. Alikhanian, the head of the Organization of Agriculture - Jahad - Jennat Rudbar visited the cold water fish farm of Mr. Behrouz Glin Moghadam located in Hezarlat Village under the management of Mr. Asghar Glin Moghadam and the cold water fish farm located in Jirud Village under the management of Mr. Rahman Amini. During this visit, various issues were discussed regarding the current conditions and aquaculture capacities. The cold water fish farm of Mr. Behrouz Glin Moghadam is located in the northern part of Hezarlat Village, in a valley area and adjacent to Hezarlat River. The water required for this farm is supplied from two water sources: mountain stream (water flow rate of 100 liters per second) and spring (water flow rate of about 15 liters per second). This farm is engaged in the production of rainbow trout larvae and juveniles, and all the larvae and juveniles in the ponds and pools of this farm were in perfect health. The fish feed produced by the Faradaneh Company was used to feed fish juveniles and growing fish. Dietary supplements, vitamin C and multivitamins were used to fortify the feed. Sodium chloride, copper sulfate, formalin, and antibiotics such as oxytetracycline and enrofloxacin were also used to disinfect and treat the fish. The cold water fish farm of Mr. Amini is located near the Jirud Village. The water of this farm is supplied from Jennat Rudbar River (water flow rate of 300 liters per second), therefore it operates with only 30 % of its real production capacity. This farm is engaged in the production of growing fish. It is worth mentioning that during the visit to the cold water fish farms of Mr. Glin Moghadam and Mr. Amini, the main problems observed included the following:
Lack of water and adequate electricity, this has caused the farm to operate at a capacity much lower than its potential,
Intense muddy water during rains and subsequent severe mortality of growing fish,
Water pollution due to passing through the residential area of Jennat Rudbar District,
Despite the recirculating water system and installation of drum filters in the mentioned farm, these facilities were not used properly due to insufficient training.
At the end of the visit, the following technical recommendations were presented in order to increase the production rate and better use of water resources to realize the potential facilities:
Supply of electricity required for the farm (20 kW),
Mechanization of the farm includes setting up the recirculating water system with the water flow rate of 300 liters per second, installing the drum filter, installing aerators such as air - jet and splash, and if possible, installing the central oxygen generator,
Installation of ozone and UV devices to disinfect water,
Training the farm manager to keep the water depth of the pools low to prevent fish deaths during muddy water,
Providing a suitable solution for the timely use of existing facilities, especially the recirculating water system and drum filter, considering that the farm has adequate electricity,
Installing ozone and UV devices to disinfect farm water and increasing the production.
Finally, at the request of two rural women interested in constructing a small - scale rainbow trout production unit (rural employment) on their personal property, they visited the water stream in the Sormoshk Village, Jennat Rudbar District. After the study, it was found that the stream water is suitable for cold water fish farming. Technical instructions and guidelines for obtaining a permit, how to build ponds and transfer water to them are provided to two rural women. It was decided that in future visits, along with the progress of the work, the necessary instructions for constructing ponds, buying fish, stocking fish in the ponds and how to raise fish will be provided to those interested in implementing this project.