Resources and Dead Zones

Overfishing results when

• Too many fish in the population are being caught

• The fish is not reproducing enough to maintain its population

• The fish keeps reproducing and multiplying out of control

Which data may scientists use to monitor the health of a fish population?

• How much a particular fish is caught during the year

• Average mass of the fish

• The size of population of the fish

True or False: An unhealthy fish population does not affect the food web for that ecosystem.

• True

• False

Which of these factors are affected in a dead zone?

• Nitrogen

• Phytoplankton

• Bacteria

• Fish

True or False: Fertilizers used for growing crops always stay within the boundaries of the farm.

• True

• False

The resource that organisms compete for in a dead zone is

• phytoplankton

• algae

• decomposer

• oxygen

Which of the following factors increase in a dead zone?

• Nitrogen

• Phytoplankton

• Decomposer

• Fish

In a dead zone, _________ levels are really low such that living organisms are not able survive.

• nitrogen

• oxygen

• fertilizer

• carbon dioxide

Based on the diagram, which fish species is in a breeding zone with higher oxygen levels?

• Fish Species 1

• Fish Species 2

For the fish eggs to mature properly and hatch, there must be at least 2 mg/L of oxygen in the water. Which fish species is more likely going to breed successfully?

• Fish Species 1

• Fish Species 2