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the recovery time for fish is generally a minimum of 4 hours and
can range up to 12 hours.
Are you Stunning All the Fish?
Electrofishing is a widespread tool used for surveying black
bass because black bass are generally easily stunned by the
electric field. When stunned, all black bass are removed from the
water. However, not all black bass are likely stunned by the
electrofish boat. The electric field quickly weakens with distance
from the boat and with depth, so many fish in the area are never
affected. Some fish that have been stunned may even build up a
tolerance for the electric field. Many species also have
evolutionary adaptations that help them avoid the boat, such as
a keen lateral sensory system and eyesight. The black bass may
be able to see the boat coming and swim out of the way of the
electrical field. Many other species of fish, such as common carp
or longnose gar, have especially thick scales that protect them
from the electrical fields. Small fish, such as many minnows and
killifishes, have such a small body area that the electrical field
doesn't affect them.
What is the Recovery Time?
Generally, fish recover almost immediately after they are
stunned by an electrofisher. They become oriented in the upright
position and begin swimming normally within 1 - 2 minutes. To
fully recover from the electrofishing, it can take 4 - 12 hours,
which depends on the amount of lactate in the blood (or the level
of stress the fish experiences) and habitat conditions. It may take
also longer for the fish to recover during late summer when
dissolved oxygen in the water is low.
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