Analysis of the bio-species

What “electrofishing” is and how it works

Electrofishing is a common technique used by fisher biologist to sample the fish population from a section of a river. As the name implies, electrofishing uses electrical energy to catch fishes.

Electrofishing relies on two electrodes which deliver direct current at high-voltage from the anode to the cathode through the water. The current flow causes galvanotaxis in the fish, which has uncontrolled muscular convulsions that results in the fish swimming toward the anode.

Since electrofishing make catching fish too simple, it can be used only with a permission; otherwise it’s considered poaching.

How a team is composed

During the activities, the working team were composed of 5 members: one who operated the anode, two who used a net to catch the stunned fishes and two other members who carried a bucket where to put the fish.

A working team
A working team

The sampling

After the fishes had been caught, we classified them and we measured their length and weight. After some samplings we analyzed the age, the species distribution and the presence of invasive species.

The sampling
The sampling