Quiz: TLE 8 AFA

What does the term estuarine refer to?

• A type of freshwater lake

• The ocean floor

• An area where freshwater meets seawater

• A man-made fish pond

Answer explanation

An area where freshwater meets seawater

Estuarine refers to estuaries, which are coastal areas where freshwater from rivers or streams mixes with saltwater from the ocean. These areas are rich in biodiversity and are important ecosystems.

What is the process called where fish release eggs and sperm into the water for reproduction?

• Cultivation

• Spawning

• Propagation

• Conservation

Answer explanation

Spawning is the process where fish release eggs and sperm into the water to reproduce. This can happen in various environments, including rivers, lakes, and oceans, depending on the species.

Which type of fish cultivation uses a small area with high investment and high yield?

• Extensive

• Semi-intensive

• Artificial

• Intensive

Answer explanation

Intensive fish cultivation involves using a small area with high levels of investment, such as advanced technology, controlled feeding, and water quality management, to achieve a high yield of fish production.

What does salinity measure in a body of water?

• Water temperature

• Oxygen levels

• Salt concentration

• Number of fish species

Answer explanation

Salinity measures the amount of dissolved salts (such as sodium chloride) in a body of water. It is usually expressed in parts per thousand (ppt) or practical salinity units (PSU).

What type of propagation allows fish to reproduce naturally in their environment?

• Semi-natural propagation

• Artificial propagation

• Natural propagation

• Intensive propagation

Answer explanation

Natural propagation occurs when fish reproduce on their own in their natural environment (like rivers, lakes, or ponds) without human assistance.

Which term refers to organisms that imitate or resemble others in behavior or appearance?

• Mimics

• Spawners

• Producers

• Conservers

Answer explanation

Mimics are organisms that imitate or resemble other organisms in appearance or behavior, often for protection, predation, or survival advantages.

Which type of water is created when freshwater mixes with seawater?

• Saline water

• Estuarine water

• Brackish water

• Groundwater

Answer explanation

Brackish water forms when freshwater mixes with seawater, resulting in moderate salinity — saltier than freshwater but not as salty as seawater.
It’s commonly found in estuaries where rivers meet the sea.

What does fish conservation focus on?

• Catching fish quickly

• Using fish resources wisely and sustainably

• Releasing fish in the sea

• Raising fish in tanks only

Answer explanation

Fish conservation focuses on the wise and sustainable use of fish resources to ensure that fish populations and aquatic ecosystems remain healthy for future generations

Which type of fish cultivation uses large water bodies with minimal investment and low production?

• Semi-intensive

• Intensive

• Artificial

• Extensive

Answer explanation

Extensive fish cultivation uses large natural water bodies (like ponds, lakes, or reservoirs) with minimal investment and low management.
Because it relies mostly on natural food and conditions, the production is low compared to other methods.

In which method of fish propagation do humans collect and fertilize eggs and sperm outside the fish’s body?

• Natural propagation

• Semi-natural propagation

• Artificial propagation

• Extensive propagation

Answer explanation

In artificial propagation, humans collect eggs and sperm (milt) from mature fish and fertilize them outside the fish’s body usually in a controlled environment like a hatchery.
This method helps increase hatching success and control breeding conditions.