👉 Trichromatism is a property of certain species of fish, particularly those in the order Chondrichthyes (such as salmon), which have two primary colors of vision. These colors are achromatic, meaning they can be seen through the lens of either eye. The primary color is usually yellowish-brown, while the secondary color is typically greenish-blue or sometimes violet. This phenomenon is called trichromatism because it allows fish to see both the primary and the secondary colors
