Saltwater vs. Freshwater Fish: Why Are Saltwater Fish Stiff and Freshwater Soft?
Saltwater fish are stiff because they live in high osmotic pressure environments. They have tough structures to hold in fluids. Freshwater fish are softer because they exist in low-salinity water, which applies less pressure on their bodies. This difference in water hardness affects their physical traits and adaptations. In contrast, freshwater fish inhabit rivers and … Read more