1. Seepage of urea
- One of the prime reasons is the seepage of water from the damaged roof of the godown and mixing with the urea stored in it.
- When urea mixes with sea water, it increases the ammonia level.
- Ammonia drastically reduces the presence of dissolved oxygen in the water.
- Lack of oxygen for respiration in turn kills the marine animals.
2. Sand deposits
- The mouth of the channel is blocked by the sand deposits.
- This prevents mixing of water near fishing jetty with the water from the open sea.
3. Dissolved Oxygen
- It is the amount of gaseous oxygen (O2) dissolved in the water.
- Oxygen enters the water by various ways. Some of them are :-
- Direct absorption from the atmosphere
- By rapid movement
- As a waste product of plant photosynthesis
- It is an important parameter in assessing water quality because of its influence on the organisms living within a water body
- Dissolved oxygen level that is too high or too low can harm aquatic life and affect water quality.
- Oxygen levels that go below 1-2 mg/L for a few hours may result in large fish kills.
Section : Environment & Ecology