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.