How does the level of acid of a lake affect how many fish live there?

The acidity of a lake, measured by its pH level, significantly influences fish populations. Most fish species thrive in a neutral to slightly alkaline pH range (around 6.5 to 8.5). When a lake becomes too acidic (lower pH), it can harm fish directly by affecting their physiology and survival rates, and indirectly by altering the availability of food sources and disrupting aquatic ecosystems. Consequently, high acidity can lead to a decrease in fish diversity and abundance.