These fish must drink large amounts of saltwater and excrete small amounts of fluids while they actively secrete high amounts of salts through their gills. Fish living in saltwater have internal fluids lower in salts than the water in which they live. This is where fish regulate their intake of saltwater or freshwater to keep their fluids, such as blood, from becoming too salty or too dilute. 4.1) A physiological adaptation found in fish that enables some fish species to live in freshwater and others to live in saltwater is called osmoregulation. They have a heart to pump blood, intestines and stomach to digest food, kidneys, a liver, a gall bladder, and a spleen. As you go even farther south toward the equator, fish that live there prefer even warmer water.įish have many of the same internal organs as humans and other mammals. As a result most Texas species are warm water fish, because most of Texas’ waters are warm. Some species prefer warmer water than others. Because temperature has such a great effect on fish, different species have different water temperature preferences. For most fish their body temperature remains very close to the temperature of their water habitat. This means their body temperature changes as the surrounding water temperature changes. Aquatic organisms live in water and have adaptations to do so. That’s what it takes for life to survive. Every living thing has adapted to fit with where it lives. An adaptation is a behavioral, structural, or physiological trait that increases a species’ chance of survival in a specific environment. Bluegills are swimmers with fins enabling them to swim in water. Mallards are fliers with wings, which allow them to move through the air. Humans are walkers with legs, allowing for effective movement on land. All species are specially suited for the lives they lead. A species is a group of individuals sharing some common characteristics or qualities, and whose offspring also share those characteristics or qualities. Humans, mallards, and bluegills are distinct species.
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