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Fishing techniques :fishing_pole_and_fish: - Coggle Diagram
Fishing techniques
:fishing_pole_and_fish:
Key terms
Overfishing
:forbidden:
Number removed is greater than those brought in
By Catch
:soccer:
Catch that isnt wanted
Non target or target species that are too small
Ghost Fishing
:ghost:
Fish that are caught and killed by discarded fishing gear
Demersal Fishing
:night_with_stars:
Fishing for species on the seabed
Pelagic Fishing
:sunflower:
Fishing for species that live in open water above the seabed
Near the waters surface
Demersal
Trawling
:baby::skin-tone-2:
Species on the seabed
Cod
Haddock
Advantages
Fast
Efficent
High yields
Can meet demand
Disadvantages
High by catch
Habitat loss
Destroys coral
Long Lines
:snake:
Line of baited hoots
Cod
Haddock
Advantages
Less habitat loss
More species specific
Disadvantages
Ghost fishing
Shellfish Traps
:crab:
Baited traps
Catch crustaceans
Crabs
Lobsters
Advantages
Little chance of by catch
Unlikely to cause ghost fishing
Pelagic
Trawling
:baby::skin-tone-2:
Used for species that form shoals
Mid water
Or near surface
Pelagic fish often form single species shoals
Low chance of catching non target
Predator species may be caught
Advantages
No habitat loss
No seabed disturbance
More species specific
Less by catch
Disadvantages
By catch can still occur
Dolphins
Drift Nets
:goal_net:
Long, curtain line nets
Supported by floats
Catch pelagic species
Tuna
Advantages
Efficient
High yield
Cheap
Easy
Disadvantages
Ghost fishing
By catch
Purse Seining
:handbag:
A net is laid around a shoal of fish
The top is held by floats
Bottom is held down by weights
Pulled tight under shoal
Tuna
Advantages
More species specific
Less by catch
Efficent
No habitat loss
Disadvantages
Small net sizes catches smaller fish
Long Lines
:snake:
Line of baited hoots
Many km long
Species
Tuna
Squid
Advantages
No habitat loss
No seabed disturbance
Disadvantages
High by catch
Turtles
Seabirds
Albatross
Ghost fishing