Impact of Fish Farming and Biodiversity

The video explains the concept of biodiversity and how human activities such as fish farming, introduction of non-indigenous species, and eutrophication negatively impact ecosystems. Fish farming can lead to pollution and escape of farmed fish, while non-native species can outcompete native species and introduce diseases. Eutrophication, caused by runoff of fertilizers, leads to algal blooms that deplete oxygen in water bodies, harming aquatic life.

What does biodiversity refer to in an ecosystem?

• The amount of rainfall in a region

• The variety of different organisms in a habitat

• The temperature range of an area

• The number of trees in a forest

Which of the following is a negative impact of fish farming on biodiversity?

• Increased oxygen levels in water

• Reduction of parasites in the ocean

• Escape of farmed fish into the wild

• Decrease in global fish consumption

What is a common method used in fish farming?

• Growing fish in small tanks

• Using large nets in open water

• Building artificial lakes

• Releasing fish into the wild

What is a major reason for the increase in fish farming?

• Overfishing of wild fish stocks

• Decrease in global fish demand

• Reduction in ocean pollution

• Improved taste of farmed fish

Why are non-indigenous species a threat to native species?

• They can outcompete native species for resources

• They always have more colorful appearances

• They reduce the amount of sunlight in the habitat

• They improve the habitat for native species

What was the unintended consequence of introducing the cane toad in Australia?

• It reduced the population of native birds

• It became a larger pest than the cane beetle

• It helped increase the sugarcane yield

• It became a natural predator for native species

Which of the following is NOT a consequence of introducing non-indigenous species?

• Improvement of native species' health

• Increased competition for resources

• Decrease in native species population

• Introduction of new diseases

What is eutrophication primarily caused by?

• Excessive fishing activities

• Increased sunlight exposure

• Introduction of non-native plants

• Runoff of fertilizers into water bodies

How does eutrophication affect aquatic plants?

• It increases their growth rate

• It blocks sunlight, causing them to die

• It enhances their photosynthesis process

• It provides them with more nutrients

What happens to the oxygen levels in water during eutrophication?

• They increase significantly

• They remain unchanged

• They decrease, leading to anoxic conditions

• They fluctuate randomly