Find the Truth!

Find the Truth! Find the Truth! - Start

2016-07-27 39K 39 0 0

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Mortality caused by fishing may be replaced by juveniles that would not otherwise been . recruited . to . the adult . population. .. Fishing above the MSY is overfishing and will cause a decline in . ID: 422306 Download Presentation

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Find the Truth!




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Presentations text content in Find the Truth!

Slide1

Find the Truth!

Mortality caused by fishing may be replaced by juveniles that would not otherwise been

recruited

to

the adult

population

.

Fishing above the MSY is overfishing and will cause a decline in

juvenile

biomass.

Overfishing can often be detected by reduced catches, a reduction in average age of adult fish and

slower growth

of the fish that do survive.

Slide2

Find the Truth!

Mortality caused by fishing may be replaced by juveniles that would not otherwise been recruited to the adult population.Fishing above the MSY is overfishing and will cause a decline in juvenile biomass.Overfishing can often be detected by reduced catches, a reduction in average age of adult fish and slower growth of the fish that do survive.

So what impact does fishing have on fish populations?

Slide3

What are the environmental impacts of fishing?

Slide4

What are the environmental impacts of fishing?

What is By-catch? Organisms that are caught unintentionally. They usually dieTypes include;fish that are too small to sellSurplus to quotasSpecies of no commercial value

Albatrosses caught in long lines

Whales/dolphins caught in drift nets

species inadvertently caught in trawl nets

Slide5

Ghost fishing

Fish, lobsters etc caught by discarded or lost fishing gearSeabed damageCoral reefs damaged by nets.Foodchain effectsSome species become more common if their predators are over-exploitedReduced food supply for predators, increased food supply for competitors.

Other Environmental Impacts

Slide6

The Crown-of-Thorns is a ,

carnivorous predator that preys on reef coral polyps. They climb onto reef structures, and then extrude their stomach onto the coral. This releases digestive enzymes that allow the starfish to absorb nutrients from the liquefied coral tissue. Overpopulation of Crown-of-Thorns has been blamed for widespread reef destruction. The Giant Triton (a mollusc) and the harlequin shrimp attack and feed on Crown-of-Thorns starfish. Some large reef fish, particularly Humphead wrasse, may also prey on the starfish. Decline in predator populations (through overharvesting, habitat destruction) has also been offered as an explanation for increasing outbreaks of Crown-of-Thorns starfish.

What is the threat from crown of thorns starfish?

Slide7

The Crown-of-Thorns is a , ___________________that preys on reef coral polyps. They climb onto reef structures, and then extrude their stomach onto the coral. This releases digestive enzymes that allow the starfish to absorb nutrients from the liquefied coral tissue.

Overpopulation of Crown-of-Thorns has been blamed for widespread reef destruction. The _____________(a mollusc) and the ____________attack and feed on Crown-of-Thorns starfish. Some large reef fish, particularly__________________, may also prey on the starfish. Decline in _________________(through overharvesting, habitat destruction) has been offered as an explanation for increasing outbreaks of Crown-of-Thorns starfish.

What is the threat from crown of thorns starfish?

Slide8

What are the environmental impacts of fishing?

Seabed damage

Bycatch

Food web effects

Ghost Fishing

Effects on fish stocks

examples

explanation

Complete a spider diagram to summarise the impacts. Include evidence and explanation

Slide9

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