Answer:wht could be the couse of the fish kill.
most common cause is reduced oxygen in the water, which in turn may be due to factors such as drought, algae bloom, overpopulation, or a sustained increase in water temperature. Infectious diseases and parasites can also lead to fish kill. Toxicity is a real but far less common cause of fish kill.
or this
Reduced oxygen in water caused by drought algae bloom, overpopulation or sustained increase in water tempearture
wth is needed in the ovverpopulated pond
Transfer the extra living species on a wide container(if it's too much) and must make another pond so that the living things in the container will properly managed.
Explanation:corect_me_if_am_rong
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