Excessive nutrients in a fresh water body cause fish mortality. Give two reasons.

Dear student,
Yes, it is true that excessive nutrients in fresh water body causes fish mortality. The two reasons are as follows:
1.The excess amount of nutrients in fresh water body leads to the process of eutrophication in which the algal bloom occurs. The algae grows at a very large rate and releases toxins that kill the fishes.

2. The algal bloom also reduces the dissolved oxygen of the water and disrupts the quality of the water. Thus, it makes an unfit environment for fishes to survive, leading to their mortality.

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