Erilised püügiviisid
When this ends up not being the case,
as where warm water pollutant tolerant species are found in what would be considered cold water
species habitat, then the biologists look closer into possible causes for the ecological imbalance. When
combined with water chemistry, habitat, and stream invertebrate information, a clear picture of the
ecological system is brought in to focus from which sound management decisions can be made.
8.1 Introduction
· Electrofishing
- use of
electricity to:
capture fish
guide fish
block the
movement of
fish
Elektripüük öösel
http://www.fisheries.org/units/education/fisheries_techniques/Chapter8/Night%20boat%20electrofishing
%20unit.jpg
Fish in an Electrical Field
· Behavior change or
reactive movement
· Trauma from
Stress due to
physiology
Injury due to
mechanical
tissue damage
annaabi.ee 
