Fish have for millennia been a source of food for many communities and individuals. Whether fried, boiled or eaten raw as sushi, you will most definitely lick you lips and fingers after each taste. However, how well do you actually know your fish? Lets look at the two major categories of fish.
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Saltwater Vs. Freshwater Fish
There are so many ways in which you can differentiate saltwater fish from freshwater fish. However, the main difference lies in the environment that the fish lives in. Salt water fish are predominantly found in oceans, seas and some salt water lakes. Although some fish can survive in a salt water environment, not all salt water bodies support fish life. An example of salt lake is the Great Salt Lake found in Utah. The only organism found to survive on this lake is algae.
Fresh water fish on the other hand live in water bodies that contain little or no salt concentrate (less than 0.05% salinity). These are mostly fish found in lakes such as lake Superior and Michigan and rivers such as the amazon. Some of fresh water fish include trout, tench and Nile perch.
Scientifically, the difference lies on how the fish operates in a particular water body. Salt water fish usually have less salt concentrate in its body tissues than its environment. This means that it losses a lot of water to the environment through its gills and skin. In order to compensate this short fall and avoid dehydration, they constantly drink a lot of water. They also produce less urine and secrete through its gills.
Fresh water on the other hand have more salt concentrate in its tissues than what is available in its environment. This makes it take in more water through its gills and skin and to prevent excessive water consumption it frequently releases urine. It also takes in less water.