A salmon migration lift device including a lift cable loop between two bullwheel terminals and a plurality of gondola buckets suspended from the lift cable loop which are filled with water and fish at a loading station on a downstream side of a waterway obstacle and which are emptied at an unloading station into a fish exit chute connected to the upstream side of the waterway obstacle.

An improved sensor fish with robust design and enhanced measurement capabilities. This sensor fish contains sensors for acceleration, rotation, magnetic field intensity, pressure, and temperature. A low-power microcontroller collects data from the sensors and stores up to 5 minutes of data on a non-volatile flash memory. A rechargeable battery supplies power to the sensor fish. A recovery system helps locating sensor fish. The package, when ready for use is nearly neutrally buoyant and thus mimics the behavior of an actual fish.

A shaft power plant for generating electricity by energy conversion of an outflow between upper water and lower water in a river includes at least two power plant modules, each having a vertical shaft with an open top and a shaft crown forming an inflow plane. The inflow plane is substantially parallel with the river bed and extends below a water level of the upper water. Each of the power plant modules also has a turbine generator unit arranged in the shaft. The power plant also includes an ecological connecting channel formed as an outflow from the upper water into the lower water without generating electricity by energy conversion.

Zero-ascend omnispecies (ZAO) attraction system includes a fish passage attraction module that can be deployed in a fishway where water flows downstream. The fish passage attraction module includes a body having a first end and an opposite second end, first adaptor adjacent the first end and second adaptor adjacent the second end. The adaptors are configured to alter water flow fields downstream of the module so as to attract fish to an entrance thereof.

The present invention comprises a fish guidance rack (2) for use in a fish guidance system in a watercourse (W) at a run-of-river hydropower plant or a water intake. The rack comprises a series of vertical bars (1) mounted on a rack frame (7) along a longitudinal axis (L) of the rack between a first end (5) of the rack and a second end (6) of the rack. The rack comprises bars with a hydrodynamic curved form, and a generally increasing inter-bar spacing (sb) in the downstream direction.

A water-replenishing fishway with an adaptively-adjusted floating dock is provided. The water-replenishing fishway comprises a fishway body, wherein the bottom of the fishway body is rotationally connected with a floating dock structure, an auxiliary swimming structure is arranged inside the fishway body, and an adjusting structure used to adjust the auxiliary swimming board of the auxiliary swimming structure is arranged on said floating dock structure. The fishway body is excavated with a sliding groove fitting with the sliding block, a first spring is arranged between the sides of the sliding groove and the sliding block, and the bottom of the sliding block is articulated with a roller, which is in contact with the surface of the moving plate of the adjusting structure.

The device for the migration of aquatic animals has a channel body with an upstream end and a downstream end as well as a longitudinal axis. The bottom of the channel body is provided with a cover layer made of natural bottom substrate and/or debris material and has a ridge running along the longitudinal axis. Plate-shaped lamellae are arranged in the channel body transversely to the longitudinal axis of the channel body. The lamellae have a downwardly open lower cut-out, which is limited at the top by a transverse element, wherein the cross-sectional area of the lower cut-out is dimensioned in such a way that the ridge of the cover layer may be accommodated in the lower cut-out. The upper edge of the transverse element has a preferably curved contour, which is inclined towards the centre of the channel and defines a lower boundary of an upper cut-out of the lamellae extending upwards from the transverse element.

The present application discloses a fishway with a pool head and pool tail in the field of fishway technology. The fishway includes a pool head, a main fishway, and a pool tail arranged sequentially from an upstream to a downstream. The main function of the pool head and the pool tail is to adapt to the fluctuation of the upstream and downstream water levels, so as to avoid the impact of the upstream and downstream water level changes on the main fishway. To achieve the above purpose, an upstream maintenance gate, a double-gate and dual-control working gate (dual control refers to flow control and fish passage effect control), an upstream steep-slope fishway, and fish guiding facilities are set at the pool head. A downstream steep-slope fishway, a water replenishment channel, and a downstream maintenance gate are set at the pool tail.

Aspects of inventive concepts are directed to a dam system for entombing contaminants in a river. The dam system may include a preexisting structure, a dam, and a cap. The preexisting structure may be in the river and have associated therewith a contamination zone defined by a location of contaminants. The dam may be constructed upriver or downriver of the preexisting structure. The cap may be coupled to the preexisting structure and the dam. The cap may span and entomb the contaminants in at least a portion of the contamination zone.

There is provided a system and method for managing fish migration in a body of water in the vicinity of an artificial or natural barrier. The system including a source of saturated water, where the saturated water is water having a dissolved gas level that is higher than that in the body of water. The system also includes outlets in fluid communication with the source of saturated water, each outlet being positioned at a predetermined position in the body of water to eject the saturated water into the predetermined position. The system further includes a pump in fluid communication with the source of saturated water and the outlets for moving the saturated water from the source to the one or more outlets, wherein flow of the saturated water into the body of water raises the dissolved gas level at the predetermined positions, thereby drawing the fish towards the predetermined positions.