A hydropower system comprised of prefabricated modules. The system includes an assembly having a first plurality of modules forming a first vertical stack and a second plurality of modules forming a second vertical stack. Each of the vertical stacks also includes at least one of: a first plurality of horizontal seals between the first plurality of modules, and a second plurality of horizontal seals between the second plurality of modules. Each of the vertical stacks further includes a plurality of vertical seals installed between the first plurality of modules and the second plurality of modules.

Disclosed are a step-by-step paired and up-down reciprocating combined fishway and a fish passage method thereof, belonging to the technical field of fish passage facilities. The present disclosure aims to provide an efficient fish passage technology for a low-head water control project, which overcomes the defects of long construction length and low fish passage efficiency of the traditional fishway. The present disclosure includes several fishway units, a mechanical transmission system, a fish repelling system, a control system, and a recovery cableway. Under the combined action of the mechanical transmission system and the fish repelling system, the fishway units reciprocate up and down step by step to form a fish passage way. The weight of the fishway units is balanced through the rotation of coaxial eccentric wheels, and the energy consumption of the mechanical transmission system is reduced. The joint of the fishway units is achieved through embedment and sliding between a sliding slot and a slider and tangent rolling between a roller row and a partition plate. In accordance with the present disclosure, the fishway construction length can be shortened, the construction cost is saved, the influence of water conservancy and hydropower projects on river connectivity is effectively decreased, and broad engineering application prospects and important ecological and economic benefits are achieved.

A migratory fish passage arrangement arranges water flow past an obstacle upstream of the water's natural flow direction, and includes a hydraulic flow arrangement with a first intake tube from upstream of the dam from an intake point to a location downstream of the dam to a feeding point, where a fish gate allows fish to enter into an elevation tube, to enter from the feeding point in the water in the elevation tube to be transported in the elevation tube to an outlet upstream of the dam. The intake point is higher than the outlet. Also disclosed is a system to guide a migratory fish to pass a dam that includes the migratory fish passage arrangement and additionally a siphon tube from an upstream location with respect to the dam to a downstream location with respect to the dam to constitute a migratory fish return route.

A fish pass system includes a helical blade having an outside diameter and an inside diameter extending between a first side of the helical blade and a second side of the helical blade. The inside diameter controls a flow of water flowing in a direction from the first side to the second side, and the inside diameter defines an open center of the fish pass system. Fish traveling in an opposite direction to the direction of the flow of the water pass through the fish pass system by riding in a space between helical blades as the helical blades are rotating, and fish traveling in the direction of the flow of the water pass through the open center of the fish pass system by swimming or moving over the inside diameter of the helical blades.

This disclosure discloses a fish-passing system and a fish-passing method with tourist ornamental function, belonging to the technical field of water conservancy and hydropower ecological protection. The system comprises a dam, a Ferris wheel, a water supplement component, and a central controller. The upstream of the dam is equipped with a fish-release chute, and one end of the fish-release chute extends into the water body of the dam reservoir. The downstream of the dam is equipped with a fish passage transfer mechanism, and the fish passage transfer mechanism is connected to the downstream water body of the dam through a fish passage. The Ferris wheel is located between the fish passage transfer mechanism and the fish-release chute, and a number of fish-carrying and human-ascending mechanisms are evenly arranged on the Ferris wheel.

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 mechanical fish trap system is adapted to be installed in native water environments. The trap chamber is positioned in a first native water environment. The chamber includes a trap gate to allow a fish to swim into the trap chamber and then retain it therein. A water pipe is connected to the trap chamber. A water pump then pumps water through the water pipe and into the trap chamber and out the trap gate. The water pipe inlet is positioned in a second native water environment that is imbalanced with the water in the first native water environment.

Disclosed is a floating river module that has at least one buoy to float also the other parts of the module, the other parts including an at least partly sub-merged vertical wall element being solidly attached to the buoy, the vertical wall element including a horizontal keel element. Also disclosed is a floating river system formed from such modules for guidance of fish.

The present invention is a fish passage system for use at dams. It may incorporate one or more reversible pump-turbines for controlling and generating power from downstream flow of water and fish and for pumping water and fish upstream. For low head embodiments the system may use water stored at above headwater elevation in lieu of a reversible pump turbine for moving fish and water from tailwater to headwater.

A system of harvesting sea creatures from a trench holding the sea creatures in seawater, including a trench, an injection well, and a harvesting apparatus that extracts the sea creatures from the trench. The trench includes a gate at one end of the trench. The gate insertable into an opening at the end of the trench to prevent seawater from entering or exiting the trench and removable from the opening to allow the seawater to enter or exit the trench. The injection well is positioned external to the trench and can receive the seawater discharged from the trench. The harvesting apparatus includes a conveyor that inclines. The conveyor includes a conveyor belt and a wedge at one end of the conveyor that contacts the bottom floor of the trench when the conveyor is inclined.