The joint extension meeting was held in the conference hall with the presence of Mr. Soleimani, the expert in charge of the agricultural extension office of the Organization of Agriculture - Jahad - Mazandaran province, and the specific research experts of the Caspian Sea Ecology Research Center as well as the head of the Coldwater Fishes Research Center of Tonekabon. At the meeting, the regulations for the activities of the specific research experts were presented by the fisheries and aquaculture extension representative and then the scope of activities of the selected experts of the Caspian Sea Ecology Research Center and the Coldwater Fishes Research Center of Tonekabon was determined based on the expertise of each person in different cities of the province. Mr. Soleimani stated that the specific research experts are obliged to inspect their field of activity in different cities of the province every month and to study the existing issues and problems and to be in contact with the expert in charge of the agricultural extension office of the Organization of Agriculture - Jahad of the city. It should be noted that the number of the specific research experts of the Caspian Sea Ecology Research Center is 8 and the number of the specific research experts of the Coldwater Fishes Research Center of Tonekabon is 7.