What is the difference between saltwater and freshwater fish?

☘️Color and shape: The variety of shapes in freshwater fish is limited. Often, their shape is similar to common fish, but this variety of form is much more in saltwater fish. For example, a fish cock, which looks like a spine, or a stone fish, which looks like a piece of stone until it moves. The color spectrum of saltwater fish is also much wider. Of course, this does not mean that freshwater fish The different colors of Malawi cichlids or discus fish are examples of colorful freshwater fish. But in similar colors, the transparency and brightness of the color is more in saltwater fish. Physiology: An aspect of fish physiology. which is called osmotic regulation expresses the main biological difference between saltwater and freshwater fish. Osmotic regulation explains how water flow is regulated throughout the fish's body, which includes a combination of body tissues, gills, and kidney function. To compensate for lost water and prevent dehydration, saltwater fish consume a large amount of saltwater. drinks, and produces a little urine. On the other hand, the amount of salt in the body tissue of a freshwater fish is higher than the water it lives in. As a result, water is constantly entering the body of the freshwater fish through its skin and gills. It flows and the fish has no reason to drink extra water. It even produces a lot of urine to prevent the accumulation of water in the body. Types of freshwater fish can be cold water fish or tropical fish. Cold water fish are mostly of the same family as gold fish, while tropical freshwater fish include a larger family. Among tropical freshwater fish, we can mention angel fish, discus, cichlids, and barbs. But saltwater fish are all cold water fish, such as clown fish, butterfly fish, eel, sea horse and cockerel fish.

☘️ Living conditions: lakes, rivers and streams, which are the natural habitat of a fish. They form fresh water and usually undergo periodic changes in nature. This process has made this fish more adaptable to changes in both natural and aquarium environments. However, the almost constant conditions of the oceans have made saltwater fish more sensitive. Saltwater fish need an environment with low fluctuations in temperature, salinity, ammonia, nitrate, and pH levels. The pH of a saltwater aquarium should be between 8.2 and 8.4. While, according to Aquacon.com website, PH can vary from 6 to 9 in different types of fresh water.

☘️Costs: On average, the cost of setting up a saltwater aquarium, excluding fish, is 50%. It is more than its counterpart in fresh water. The cost of fish, food, supplements and periodical services is almost twice as much as in fresh water.

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