Question

describe why freshwater fishes are stenohaline

Answer 1

The freshwater fishes are those that spends some or all 0f their lives in fresh water such are rivers and lakes as well the salinity of water would be less than 1.05%. The freshwater fishes differ physiologically from salt water fish in various aspect that their GILLS must be able to diffuse dissolved gases ,their scales reduces water diffusion through skin, freshwater fishes that have lost their scales will die soon,, these fishes also have well developed Kidneys to reclaim salts from body fluids before excretion.,STENOHALINE is a condition where an organism is able to tolerate only a narrow range of salinity,.so stenohaline fishes are those fishes that cannot tolerate a wide fluctuation in the salinity of water the reason that all fresh water fishes are stenohaline because osmoregulation actively control salt concentration despite the salt concentration in the environment that is why the freshwater fishes are stenohaline which means they are restricted to either salt or freshwater and cannot survive in the water with the different salt concentration than they are adapted,.