This article deals with the aggregation response of autumn hairtail fish to the temperature in the stretching water tongue. The response usually occurs in the joint area of tongue front and current rip where the temperature is suitable to the fish. It is denser aggregated near the tongued central line. The fishing yeild grows with the density becoming greater, which makesr it possible to make sport'time prediction aboul the central fishing ground by analysing the changes in distribution of water-masses and ...