HANS GRASSL range

An electric fishing device, also known as an electrofisher or electrofishing unit, is a device primarily used to capture or study freshwater fish in a temporarily non-lethal manner. Below is a general description of how it works and its components:

1. General Description

The electric fishing device emits an electric current into the water to trigger a reaction in the fish known as galvanotaxis: the fish are drawn toward the positive electrode (anode), making them easier to catch using a net.

2. Main Components

Power Generator

Portable device (often worn as a backpack) or stationary.
Produces pulsed direct current (DC) or alternating current (AC).
Adjustable voltage (typically between 100 and 600 volts).

3. Anode (Positive Electrode)

Often a metal ring attached to the end of a pole.
Operated by the user to direct the electric field.

4. Cathode (Negative Electrode)

Immersed in the water (often dragged behind the operator or attached to their belt).
Completes the electric circuit.

5. Power Source

Rechargeable battery (commonly lead-acid or lithium).
Must provide enough power to generate the electric field in the water.

6. Usage

Scientific studies (fish population surveys, monitoring, etc.).
Fisheries management (fish relocation, restocking, etc.).
Conservation efforts (relocating endangered species, controlling invasive species).

7. Safety and Regulations

The use of these devices is regulated in many countries (permits, required training, etc.).
The current can be dangerous to humans and animals if misused.
Should only be operated by trained personnel using proper protective equipment.

Subcategories

HANS GRASSL Portable...
Portable Electric Fishing Device – HANS GRASSL

The portable electric fishing devices from the HANS GRASSL brand are professional-grade equipment known for their efficiency, reliability, and durability. Designed for fieldwork, these devices are widely used in scientific research, fisheries resource management, and ecological monitoring.

Lightweight and easy to transport, the device operates with a rechargeable battery (typically 12V or 24V) and can generate a continuous or pulsed current, adjustable depending on site conditions (water conductivity, type of aquatic environment, targeted species). The electric current, temporarily applied in the water, immobilizes fish without harming them, facilitating their capture, identification, measurement, and release.

General Specifications:
- Power supply: 12 V or 24 V rechargeable battery
- Output voltage: 600 to 1000 V DC (adjustable)
- Current type: Continuous or pulsed
- Use: Rivers, streams, lakes, shallow water areas
- Components: Generator, anode (pole with ring), cathode (dragged cable), harness or backpack support
- Safety: Complies with VDE standards and IEC 60335-2-86 directive
Applications:
- Temporary fish capture for scientific studies
- Sampling of aquatic populations
- Species control and management (broodstock, juveniles)
- Environmental monitoring
Compact and ergonomic, the HANS GRASSL portable device is an ideal solution for aquatic ecology professionals and field technicians.
HANS GRASSL stationary...

Hans Grassl stationary electric fishing devices are designed for fixed electrofishing operations in specific locations such as fishery monitoring points, research stations, or control installations. These devices are permanently installed on the banks of water bodies or on docks, allowing regular and controlled electrofishing without frequent relocation.

These devices typically operate with a stable power supply, whether from a combustion engine, battery, or mains electricity, providing consistent power for fish capture in freshwater or brackish water. They comply with safety standards including VDE and IEC 60335-2-86 directives.

Their system delivers pulsed or continuous electric current through a submerged anode and cathode, triggering a reaction in fish (electrotaxis) that facilitates their capture using nets.

Hans Grassl stationary models are particularly suitable for scientific studies, sustainable fishery management, population control, and long-term conservation efforts. Their robustness and reliability allow intensive use in varied environments.