Science and technology activities for the community aims to provide knowledge to them in finding solutions to problems. Tateli II is one of the villages in Tateli II Village, Mandolang Sub-district, Minahasa District, North Sulawesi Province. Tateli II village fishermen are often or often confused with the marketing of fishery products because of the low selling price; this is because of their low state of knowledge about postharvest handling so that income is always low. Fishermen should be taught how to handle post-harvest catch so that when sold will create a reasonable price and at least be in accordance with the results of the business. One effort to maintain the quality of fishery products of fisherman production since harvested to the hands of consumers, and fish in a fresh / wet condition is handling with cold chain system (cold chain system).Training methods are based on adult learning methods (self-taught) and classically by providing theory and practice through lectures and group discussions (FGD: Focus Group Disscution). Implementation is made by providing theory as much as 25% and practice as much as 75% for 8 months.First, approach the village government to obtain permits and discuss the timing of meetings for the implementation of the technology extension / demonstration that will be implemented in view of the importance of time-gathering arrangements in this case the fishermen group.Extension and training activities can provide a view to the fisherman about the importance of post-arrest handling that is to maintain the quality of the fish in a cold state so it is not easily damaged or rotten. Counseling is given to the fishermen either individually or in groups. Conducted in groups in order that they can use this group in developing a capture fishery business can propose funding and / or equipment aid proposals through existing groups.Based on the results of observation, counseling and training, the activities of IbM Fishermen Group of Tateli II Village of Mandolang Sub-District of Minahasa Regency: 1. Fisherman Group of Tateli II Village of Mandolang Sub-district, have conducted fishing activities and there is desire from them all to use system where fish must be kept cool or keep it at a low temperature. 2. The fishermen group of Desa Tateli II Mandolang sub-district is able to understand that by maintaining the temperature of the fish remains cool the selling price can be high and apada can eventually increase their income. 3. Individual awareness as well as group members on the importance of group roles, spontaneously they want to submit fund and equipment proposal to the Government of North Sulawesi Province. Changes in attitude towards such development can provide a guarantee of the sustainability of their business so that the future can change the state of the economy and their daily circumstances and their families in a better direction.