Scenario 1
Because there was such a high jump in pesticide during September, the pesticide had a chemical reaction with the water and contaminated the water, causing the fish to ingest posionous water and die. In addition, high levels of lead in the water could have caused the fish to die because lead is a heavy metal which is dealthy to ingest for living creatures.
Scenario 2
The jump in nitrate caused the fish kill for scenario 2. Because nitrate is highly toxic, when a large amount of it was in the water the nitrate had a chemical reaction with the water and it stopped the oxygen from being able to dissolve into the water. So, the levels of dissolved oxygen in the water were very low compared to previous months during the year. Without enough oxygen in the water, the fish could die from a lack of oxygen. So, this is probably what led to the fish kill.
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