Freshwater fish are adapted to live in a diverse range of habitats. Some species can survive in mild temperatures 24 degrees Celsuis , while others thrive in temperatures between 5 to 15 degrees Celsius. Freshwater fish are found in shallow wetlands, lakes and rivers, where the salinity of water is less than 0.
Saltwater fish are found in various habitats, ranging from the cold Antarctic and Arctic oceans to warmer tropical seas. Habitats that best suit saltwater fish include coral reefs, salt ponds, mangroves, seagrass beds and the deep sea, and a range of fish have developed to thrive in each of these conditions. Freshwater fish include catfish, charr, cisco, mooneye, gar, shiner, trout apache, blueback, brook, brown and cutthroat , sunfish, pike, salmon pink, coho, chum, Chinook and altantic and whitefish.
Saltwater fish includes albacore, certain types of bass, bluefish, common dolphin, butterfish, eels, flounder, cod, marlin, mackerel, herring, shark, snapper, tuna and yellowtail. The smallest saltwater fish is the Marshall Islands goby fish which measures 0. Sturgeon and catfish have whisker-like feelers that allow them to taste and touch food before ingesting it.
Swordfish, marlin and sailfish stun their prey with their unique bills before feeding on it. The paddlefish stirs up bottom-dwelling organisms with its paddle-shaped snout to feed on them. The goosefish or angler has an enticing appendage located the upper portion of its snout. It entices prey by wiggling it like a worm, luring the food to itself. This is because of the presence of salt content in the water.
There is another property concerned with it that is the tonicity of the water, which is something related to the concept of osmosis. The water moves through a semi-permeable membrane to the side where is a high solute concentration to make even the solution. Therefore, saltwater is a hypertonic solution and has to be consumed frequently to absorb water and eliminate salts by the organisms living there.
Freshwater is defined as the water that has a low salt concentration in it along with that it does not have any taste, odor, or color. The sources of freshwater can be divided into two types — the standing reservoirs like ponds, lakes, inland wetlands, and floating reservoirs like rivers, streams, etc. The organisms which cannot live in the extreme hot or extreme cold are found in freshwater. Some of the examples of fish living in freshwater are — Salmon, pike, trout, catfish, char, cisco, sunfish , etc.
Scientists have studied various properties of freshwater, and thus, tonicity is one of them. The organism whose habitat is freshwater uses the phenomenon of osmoregulation which is, to be precise, is a process where absorbs water and frequently excrete it out from their body to even the salt concentration.
Water exists in three major forms, which are known to everyone solid, liquid, and gases. It is available on the earth in all three possible forms.
Saltwater Ecosystems Ocean life is incredibly diverse. From the largest whale to the smallest plankton, the ocean is filled with wonders. Coral reefs, dolphins and a huge array of fish call saltwater ecosystems their home.
There are kelp forest, mangrove and rocky shore ecosystems. Coral reef and deep-sea ecosystems also support different types of life. Considering that more than 70 percent of the planet is covered by oceans, and 97 percent of the planet's water is the ocean, it's safe to say that the most prevalent form of water on Earth is saltwater.
Salinity Levels The average salinity of ocean water is 3. The salinity of different bodies of water hinders organisms from thriving in both saltwater and freshwater.
Some plants and animals survive in one type of water but not the other. Water Density Another considerable difference between the two is their density. Saltwater has a higher density than freshwater because of the sodium chloride it contains.
Furthermore, cold saltwater is denser than warm saltwater but it becomes less dense when water freezes into ice.
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