What are the effects of noise pollution on fish?

In one line

The rule

Noise pollution is the presence of excessive or harmful sounds in the environment that can disrupt and harm living beings, including fish. (NCERT Class 5, 6, 7, 8)

Let's understand it simply

Imagine you are trying to sleep, but someone is bursting crackers or playing loud music outside your window. You feel disturbed, right? Fish live in water, but sound travels even faster there. When there is too much noise in rivers, lakes, or the sea—like from boats, ships, or underwater machines—fish get disturbed just like you do with loud sounds.

Fish use their senses to find food, avoid danger, and talk to each other. Loud or strange noises can confuse them, make them stressed, or even hurt their bodies.

How it works

1. Loud underwater sounds enter the water from boats, ships, or machines.
2. These sounds travel quickly and reach the fish.
3. Fish get scared or confused because their senses are disturbed.
4. Some fish cannot find food or escape from predators (animals that eat them).
5. Long-term noise can damage their hearing or even kill small fish.

The story behind it

Scientists started noticing fish behaving strangely near busy ports and construction sites in the last few decades. They found that underwater noise from human activities was the cause. Research now shows that noise pollution is a serious problem for fish and other sea animals.

Where you see it in real life

• Fishing boats using loud engines → Fish swim away from the noise, making it harder for fishermen to catch them.
• Building bridges or dams → Machines used underwater make loud sounds, which can scare away or harm fish living nearby.
• Underwater blasting for mining → Explosions create shock waves that can kill or injure fish.
• Loudspeakers near ponds during festivals → Sound travels into the water, disturbing fish in village ponds.

Why it matters

• Fish are an important food source for many people in India.
• Healthy fish populations keep rivers and lakes clean by eating insects and plants.
• If fish are harmed, fishermen lose their livelihood.
• Some rare fish species may disappear forever if noise pollution is not controlled.

Common mistakes

• Thinking fish cannot hear: Fish sense sound through their bodies and special organs.
• Believing noise only affects humans: Noise pollution harms all living things, including fish.
• Ignoring small noises: Even small, regular noises can disturb fish over time.

Remember it

Noise pollution in water can make fish sick, lost, or even kill them—just like loud noise troubles us.