Aphanius arakensis

Aphanius arakensis, known for its intriguing sexual dimorphism, is a small-sized freshwater fish found in Iran. It's a resilient species, often inhabiting temporary and fluctuating water bodies, a factor that showcases its adaptability to varying environmental conditions. The males are more brightly colored than the females, which is typical in the Aphaniidae family, to attract mates. This fish has adapted to survive in both brackish and freshwater, reflecting its origin in areas with varying salinity.