5 Basic Characteristics of Fish


Fish have basic characteristics which help them to live in water. Fish are aquatic vertebrates that contain a vertebral column called a spine. A classic fish is usually a torpedo shaped.

fish charecteristics

The fish contains head containing a brain and sensory organs, a trunk which has a muscular wall surrounding a cavity with all the internal organs along with a muscular post-anal tail.

However, all fish share some common evolutionary adaptations that assist them to thrive into their watery domain. Species of fish also change from other water-dwelling creatures, including whales and dolphins (that are mammals) and turtles (that happen to be reptiles). The ocean, alone, hosts around 18,000 types of fish, that humans are aware of where there are many more scientists still haven’t discovered. While there are a few exceptions to those rules.

1. How Fish Breathe Underwater?

All fish have gills present at the time they are born until they die. Gills are feathery organs full of blood vessels. Gills help how a fish breathe. A fish breathes by taking water into its mouth and forcing it out through the gill passages help to absorb oxygen in the water and present off co2. The gills are situated on each side of the fish’s head.

2.  Fish Are Coldblooded

Fish are ectotherms or cold-blooded species. They cannot regulate their body temperature and they are dependent on the external environment like other amphibian’s fish become hotter and colder according to the outside temperature. A fish’s temperature fluctuates based on the water’s temperature and, like lizards, cold water could make them sluggish. Some fish in colder bodies of water, like lakes, go dormant during the winter months.

3. Fish Detected Nearby Movements

Fish has specialized sense organ termed as a lateral line that runs across the length of the body. This sixth sense allows them to detect water vibrations. Detect movements help fish to find prey and escape from predators. This organ Situated under the scales, it is made up of ducts which can be filled with a fluid. Even if there isn’t a light, the fish can detect food and predators, and in some cases navigate by using this specialized organ.

4. Swim Bladders that Help Fish to Sleep

The swim bladder is an internal organ that has the ability to control the fish buoyancy.

All fish use a swim bladder, that is filled with air helping to ensure that the fish looks after a stable buoyancy in water, neither sinking nor floating an excessive amount. The presence of a swim bladder allows the fish to settle water without sinking to your bottom of that habitat. In some type of fish, air is swallowed and sent on the swim bladder. This adaptation will also help the fish to thrive in waters that don’t have adequate degrees of oxygen.

fish underwater

 5.  Fish Fins Under Water

Fins are normal to all fish. Fins located at different parts of the fish for different purposes:

i.  Dorsal fins

Dorsal fins are found on the back of the fish. These fins protect the fish against rolling and assist in sudden turns. Most fish have One dorsal fin but some have up to Three fins.

ii.  Pectoral fins

Pectoral fins are located on each side of the fish, around where the head meets the body.

iii.  Caudal fins

These fins are also known as the tail fins. The tail fin propels the fish forward while swimming. Mostly these fins are present in most species of fish.

iv.  Anal fins

Anal fins help to maintain the stable equilibrium in the water


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