Fishing methods and sustainable fisheries

Created by: Orion_Moore
Created on: 18-04-14 21:17

Purse seine nets

Used to catch schools of fish near ocean surface (e.g. tuna, sardines). Nets are lowered and encircle / close around fish, yielding a large catch (entire schools of fish trapped). May also catch non-target species (e.g. dolphins).

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Benthic trawling

Used to catch species on/near sea bed (e.g. cod, halibut). Nets drag along sea bed, causing damage to coral reefs. Physical damage can cause loss of habitats. Non-target species can be affected by habitat loss and/or be caught themselves.

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Factory ships

Large fishing boats which stay at sea for long periods of time. Freeze catches. Contribute to overfishing / depletion of fish stocks.

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Restriction by season

Closed seasons protect breeding stocks. Refuge areas allow fish populations to recover / increase.

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Restrictions on fishing method

Minimum mesh size (allows juveniles to escape); banning drift nets (which catch too many unwanted species); mandate use of rod and line to reduce number caught

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Restrictions on fishing intensity

Reduce number of boats allowed to catch fish; limit boat/engine size (to limit catch per boat)

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Gill nets

Indiscriminate, trapping a wide range of organisms. Marine mammals are trapped and become unable to reach surface, thus suffocating.

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Drift nets

Large and indiscriminate. Tend to catch many juveniles of target species. These can be thrown away, but most throw-backs die.

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Other cards in this set

Card 2

Front

Back

Benthic trawling

Card 3

Front

Large fishing boats which stay at sea for long periods of time. Freeze catches. Contribute to overfishing / depletion of fish stocks.

Back

Card 4

Front

Closed seasons protect breeding stocks. Refuge areas allow fish populations to recover / increase.

Back

Card 5

Front

Minimum mesh size (allows juveniles to escape); banning drift nets (which catch too many unwanted species); mandate use of rod and line to reduce number caught

Back

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Fishing methods and sustainable fisheries