What are the effects of sunlight on aquatic life inhabiting the Caspian Sea?

Sunlight plays a crucial role in the Caspian Sea's aquatic ecosystem by driving photosynthesis in phytoplankton, which forms the base of the food web. Adequate sunlight supports the growth of these primary producers, influencing the abundance and diversity of fish and other marine organisms. However, excessive sunlight can lead to increased water temperatures and algal blooms, which can deplete oxygen levels and harm aquatic life. Additionally, UV radiation can negatively impact some species, particularly those that are sensitive to changes in light conditions.