Commercial Fisheries

studied byStudied by 0 people
0.0(0)
Get a hint
Hint

What is a traditional definition of a fishery?

1 / 15

encourage image

There's no tags or description

Looks like no one added any tags here yet for you.

16 Terms

1

What is a traditional definition of a fishery?

The union of aquatic organisms and humans for consumptive purposes.

New cards
2

How is a commercial fishery defined?

Extraction and sale of fish for consumptive purposes.

New cards
3

As pressure on wild fish stocks to satisfy consumer demand increases, so does…

fish mortality

New cards
4

What is bottom trawling?

A commercial fishing technique where a large net is dragged across the ocean floor by a boat.

New cards
5

What are the primary target species in bottom trawling?

Includes pacific cod, rockfish, halibut, and shrimp.

New cards
6

Downsides to bottom trawling

  • Non-target species often end up in the nets

  • Trawls can last many hours

  • Habitat disturbance

  • Bycatch caught rarely survives: target or non target species

New cards
7

How can bottom trawling disturb the habitat?

  • Can dredge up settled sediments

  • Increase water turbidity

  • Deplete sea floor vegetation that are important for the ecosystem

  • Reduce habitat heterogeneity

  • Resuspension of contaminants such as PCBs

  • Impact food web

New cards
8

Reasons for discarding a fish

Wrong species, size, sex, or the fish are damaged, the quota is reached, high grading, lack of space, chance of spoiling.

New cards
9

Toal capture =

catch + bycatch + released alive

New cards
10

What is bycatch?

The part of the capture that is discarded at sea, often dead or injured.

New cards
11

What is longline fishing?

A fishing method where a main line with baited hooks is released from a boat, varying depths.

New cards
12

What types of species are primarily caught as bycatch in longline fishing?

Pelagic and migratory species. Also marine megafauna (albatrosses and sea turtles)

New cards
13

What are the target species of longline fishing?

Swordfish, tuna, sablefish, pacific cod

New cards
14

What are drift nets?

Free-floating gill nets that stay suspended in the water column. Often results in ghost nets.

New cards
15

What is 'ghost net'?

Lost drift nets that continue to catch species unintentionally.

New cards
16

Impacts of commercial fisheries on fish populations?

  • Reduction in abundance of target and non-target species

  • Disturbance and loss of essential (critical) habitat

    • Spawning locations

  • Impacts on rare or threatened species

  • Disruption of food web

  • Remobilization of contaminants

  • Fishing induced selection

    • Reduces fitness

New cards

Explore top notes

note Note
studied byStudied by 5 people
... ago
5.0(1)
note Note
studied byStudied by 2 people
... ago
5.0(1)
note Note
studied byStudied by 85 people
... ago
5.0(1)
note Note
studied byStudied by 16 people
... ago
5.0(1)
note Note
studied byStudied by 8 people
... ago
5.0(1)
note Note
studied byStudied by 153 people
... ago
5.0(3)
note Note
studied byStudied by 73 people
... ago
5.0(3)
note Note
studied byStudied by 8175 people
... ago
4.8(29)

Explore top flashcards

flashcards Flashcard (57)
studied byStudied by 105 people
... ago
5.0(1)
flashcards Flashcard (40)
studied byStudied by 25 people
... ago
5.0(1)
flashcards Flashcard (104)
studied byStudied by 29 people
... ago
4.7(3)
flashcards Flashcard (38)
studied byStudied by 5 people
... ago
5.0(2)
flashcards Flashcard (20)
studied byStudied by 8 people
... ago
5.0(1)
flashcards Flashcard (24)
studied byStudied by 31 people
... ago
5.0(1)
flashcards Flashcard (66)
studied byStudied by 8 people
... ago
4.5(2)
flashcards Flashcard (131)
studied byStudied by 14 people
... ago
5.0(1)
robot