Tagging & Marking

Question 1

biological tagging methods

Answer 1

1. Parasitic marks
2. Morphological marks
3. Genetic marks

Question 2

parasitic marks

Answer 2

> > used to determine stocked fish and movement/migration
adv - low survey cost, large bodies of water
dis - hard to identify, need trained personnel

Question 3

morphological marks

Answer 3

> > used to differentiate stocked fish and recapture studies
adv - low cost
dis - marks subject to environmental conditions

Question 4

genetic marks

Answer 4

> > used to identify stock fish
adv - effective in identifying stocks
dis - preserving sample for testing, need special equipment, cost

Question 5

chemical tagging methods

Answer 5

immersion, injecting, tattooing, feeding

Question 6

immersion

Answer 6

adv - large numbers of fish tagged at once
dis - retention of mark can be a problem, chemical toxicity

Question 7

physical tagging

Answer 7

internal - body cavity tags, subcutaneous, coded wire, thermal, radio, sonar hydrostatic tag, micro tags, PIT
external - mutilation, branding, visible elastomer tags, peterson discs, strap tags, carlin tags, dart tags, anchor tags