People fishing for a long time have noticed many kinds of fish. Some don't have jobs, and others only have one look. Some are very pretty, but others can be gruesome. During the early Devonian period (385-359 Ma), a lobe-finned fish called the Sarcopterygii split off from the rest of the Osteichthyes superclass. These sarcopterygians were also called tetrapods. A name often used to refer to modern vertebrates.
In 2010, paleontologists published the "inter-tidal hypothesis," which said that lobe-finned fishes came from the area between the high and low tides. They had two pairs of fleshy fins and a bone shell inside their bodies. These two fins turned into the legs of amphibians and tetrapods over time. The Osteichthyes superclass also includes ray-finned fishes, which are very similar to the lobe-finned fishes. The lobe-finned fish have paired fins held up by a fleshy stalk, while the ray-finned fish have an actual spinal column. Webs of skin tissue also hold up the rays of the fish with ray-like fins.
Bony fish are the most diverse group of vertebrates when compared to other groups. They live in both fresh and saltwater and can survive in a wide range of temperatures. They range in size from very small to very large. Most fish with bones have ray-like fins. Some species have gills or anal fins, but others do not. Also, these animals have swim bladders that help them float.
The bony fish has a skeleton made of bone and cartilage. It comprises a skull, a spinal column, a jaw, and some bones inside the muscles. Most fish with bones have a fusiform body shape, which helps them move faster. How the mouth is shaped can tell much about how the fish eats.
Before recently, people thought that jawless fish were a separate group within the superclass Agnatha. But new molecular data shows that they are all from the same ancestor. This means that they and other vertebrates come from the same ancestor. Jawless fish are in the subphylum Vertebrata and come in two different kinds. The first group, called ostracoderms, comprises vertebrates with straight, paired fins and a shell made of bone. During the Silurian Period, these types of fish were the most common. Some got as long as 2 meters.
The second type of jawless fish, called agnathans, are primitive vertebrates without side appendages. There are lampreys, hagfish, and eels among these. These animals start as larvae that live in fresh water and filter out small things from riverbeds. These animals can also bite into other fish with their teeth. There are different kinds of gurnards all over the world. They are bottom-dwelling predatory fish. Most of the time, they are called "generalists," but their specialties vary. Some of them live in the British Isles and Ireland a lot. Others only happen sometimes.
They have a high, vast, long, narrowing body, a triangular tail, and strong spines on their dorsal and tail fins. They also have two big fins on their backs and one long one. They are known as bottom feeders because they find their food by feeling around on the seabed. In some parts of the world, the guard is a type of sea robin. It gets its name from a French word that means "grunt." These fish are very nice to look at and taste great. They are high in protein and work well in soups and stews.
Even though it looks like a king, Emperor Angelfish is a semi-aggressive fish that needs a giant aquarium, a lot of rocks, and the patience of a fish keeper who has done this before. The beautiful angels can grow 6-7 inches long when kept in the right way.
The Indian Ocean, the Red Sea, and the Great Barrier Reef have these impressive fish. Many zoos and aquariums throughout the world have them on display. They can live up to 20 years in the wild. This fish is territorial and will fight other fish for its territory. They will also look for food that has been left over. The Emperor Angelfish eats plants, small invertebrates, and sponges. It is an omnivore. It is also sometimes mean to other fish.
