IB Environmental systems and societies Topic 4.3F Conservation and Management of Global Fisheries Revision Notes (HL)

IB Environmental systems and societies Topic 4.3F Conservation and Management of Global Fisheries Revision Notes (HL) | RevisionDojo

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Accurate Stock Assessment Underpins Sustainable Fishing

Definition

Fish stock

A fish stock refers to a population of a particular species of fish that is managed as a unit. It may include all individuals in a defined geographical area.

Assessing stocks and monitoring harvest rates keep fishing sustainable.
Without them, overfishing removes fish faster than they reproduce, causing ecological and economic loss.

Methods of Measuring Fish Stocks

Catch data analysis
1. The species, size, and weight of commercial and recreational catches show whether a population is stable, growing, or declining.
Tag and recapture
1. Fish are tagged, released, and later recaptured to estimate population size, growth, and movement.
Scientific research surveys
1. Research vessels use sonar, trawls, or cameras to estimate abundance and age structure, the most accurate method but costly.
Logbook monitoring
1. Fishers log catch, location, and gear; in the UK data must be submitted within 48 hours of landing, which helps check quota compliance.

Example

The FAO's Stock Status Plot (1996) sorts fisheries as developing, exploited, overexploited, collapsed, or rebuilding.

Monitoring Harvest Rates

The harvest rate is the share of a stock removed by fishing.
Monitoring keeps catches below levels that threaten the population.
Monitoring tools
1. Electronic monitoring systems (EMS): cameras and sensors record fishing activity.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Accurate Stock Assessment Underpins Sustainable Fishing

Definition

Fish stock

A fish stock refers to a population of a particular species of fish that is managed as a unit. It may include all individuals in a defined geographical area.

Assessing stocks and monitoring harvest rates keep fishing sustainable.
Without them, overfishing removes fish faster than they reproduce, causing ecological and economic loss.

Methods of Measuring Fish Stocks

Catch data analysis
1. The species, size, and weight of commercial and recreational catches show whether a population is stable, growing, or declining.
Tag and recapture
1. Fish are tagged, released, and later recaptured to estimate population size, growth, and movement.
Scientific research surveys
1. Research vessels use sonar, trawls, or cameras to estimate abundance and age structure, the most accurate method but costly.
Logbook monitoring
1. Fishers log catch, location, and gear; in the UK data must be submitted within 48 hours of landing, which helps check quota compliance.

Example

The FAO's Stock Status Plot (1996) sorts fisheries as developing, exploited, overexploited, collapsed, or rebuilding.

Monitoring Harvest Rates

The harvest rate is the share of a stock removed by fishing.
Monitoring keeps catches below levels that threaten the population.
Monitoring tools
1. Electronic monitoring systems (EMS): cameras and sensors record fishing activity.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 4.3F Conservation and Management of Global Fisheries Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Accurate Stock Assessment Underpins Sustainable Fishing

Methods of Measuring Fish Stocks

Monitoring Harvest Rates

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Accurate Stock Assessment Underpins Sustainable Fishing

Methods of Measuring Fish Stocks

Monitoring Harvest Rates

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account