The paper overviews the ways of updating intake heads of fish passing constructions in accordance with the norms of environmental protection. To achieve this aim a new construction of an intake head with a countercurrent flow based on the technology of parallel hydraulic streams is used. The article provides theoretical foundations of their use to attract fish to passing constructions for fish spawning. Mathematical conditions for the formation of a stream to attract fish have been presented and engineering solutions have been shown. The author also presents the results of his experimental research.