Erilised püügiviisid (0)

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Electro-fishing equipment is used for collecting different fish species and recording their relative
abundances, and making cursory determinations of their health based on external observations.
Collecting and recording fish data reveals what species are surviving and inhabiting a particular stream
system and to what extent the aquatic ecosystem is maintaining that population. Depending on the type
of stream visited and the field chemistry and habitat measurements taken, biologists have certain
expectations of what type of species they should expect to find. 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
55% sisust ei kuvatud. Kogu dokumendi sisu näed kui laed faili alla
Erilised püügiviisid #1 Erilised püügiviisid #2 Erilised püügiviisid #3 Erilised püügiviisid #4 Erilised püügiviisid #5 Erilised püügiviisid #6 Erilised püügiviisid #7 Erilised püügiviisid #8 Erilised püügiviisid #9 Erilised püügiviisid #10 Erilised püügiviisid #11 Erilised püügiviisid #12
50 punkti Autor soovib selle materjali allalaadimise eest saada 50 punkti.
~ 12 lehte Lehekülgede arv dokumendis
2012-10-30 Kuupäev, millal dokument üles laeti
7 laadimist Kokku alla laetud
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triini14 Õppematerjali autor

Lisainfo

Powerponint 10 slaidi. Erilised püügiviisid kalanduses.
püügiviisid , kalapüügitehnika , Elektripüük

Mõisted

Sisukord

  • Introduction
  • Elektripüük öösel
  • Fish in an Electrical Field
  • Stress due to
  • cont.)
  • Injuries to Fish
  • Electrofishing system
  • Biological Factors

Teemad

  • Introduction
  • Electrofishing
  • use of
  • electricity to
  • capture fish
  • guide fish
  • block the
  • movement of
  • Behavior change or
  • reactive movement
  • Trauma from
  • physiology
  • Injury due to
  • mechanical
  • tissue damage
  • cont.)
  • Low AC - fish lines up perpendicular to
  • flux line
  • High AC - muscle contraction and tetany
  • Hemorrhages or bruising of soft tissue
  • Fractures of vertebrae
  • NOTE: AC is more likely to injure fish than
  • pulsed DC Pulsed DC is more likely to injure
  • fish than continuous DC
  • Electrofishing system
  • power source and power control unit
  • meters
  • wires & electrodes
  • other equipment (lights, nets, pumps
  • livewells)
  • boat
  • shocking system
  • backpack shockers
  • Species - shad susceptible...catfish not as
  • much
  • Fish size - big fish feel more due to voltage
  • drop from head to tail

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