Question

5. The Bureau of Fisheries investigated that fish kill incident was due to
A. lack of oxygen supply
B. hot summer temperature
C. use of illegal fishing methods
D. lack of carbon dioxide supply​

Answer 1

The main reason to investigate a fish kill incident is to determine its cause, as fish kills can indicate that there is an emerging environmental or pollution problem, or an outbreak of a new disease.

Answer 2

The Bureau of Fisheries investigated that fish death incident was due to lack of oxygen supply

Explanation:

• The Bureau of Fisheries and Aquatic Resources defines fish kill incidents as sudden and significant mortality of wild or cultured fish.

• The Bureau of Fisheries and Aquatic Resources stated that fish kills can be caused by a variety of factors such as due to human activity and 50 percent are caused by natural causes. Insufficient oxygen in the water leads to the death of fish.

• The presence of algae in the lake is one of the factors contributing to the success of its aquaculture business. They are not only a source of food for fish and other aquatic life, but they also produce dissolved oxygen through photosynthesis.

• Algae can grow very fast under conditions of sufficient sunlight, high water temperatures, and calm water. If these conditions are sustained, algae bloom occurs, which appears as a thick green or bluish-green.

• Algal blooms become harmful when it decomposes, so they consume dissolved oxygen in the water. Dissolved oxygen is the volume of oxygen in the water that sustains aquatic life.

• Low oxygen levels are already harmful to fish, and if it drops further there is a risk for the fish to survive. Lack of oxygen is the main cause of death of fish