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A fish is considered as an aquatic animal. It only lives underwater. There are almost 20,000 species of fish. It also includes the groups of jawless fish, sharks, bony fish, and many more with different shapes, sizes, and colors. The lifespan of fish is 20 years. Catfish has the most extended lifespan of 60 years and weighs up to 170 kilos. Fishes form a large number of groups and reproduce by releasing large quantities of sperm and eggs into the water. Also, it would make sure the fertilization of eggs. Fish prefer to be in groups, known as a shoal. A shoal can contain millions of fish. A fish can lay thousands of eggs. However, a few fish would reach maturity level. The process in which a group of fish is swimming in the same direction is called schooling. Fishes use a different variety of noises for communication. They make shallow pitch sounds and use body parts like bladder and muscle vibration. Fishes are mostly carnivorous. They eat insects and other small fishes. Only a few species of fish are herbivorous, and they eat weeds and sea plants. Fishes play an essential role in various cultures. They have symbolic meanings in different regions.

The oceans of the world are filled with thousands and thousands of different living things. Scientists believe there may be a million different species living in the oceans, some of which have yet to be discovered. And just like on land, there are many different plants and animals. Many of the ocean plants either float on the surface of the water, or grow in shallow water. Plants in the ocean need sunlight to grow just like those on land. The deepest parts of the ocean may not contain plant life because the energy from the Sun cannot reach deep into the ocean. An ocean plant called seaweed is a type of algae called phytoplankton. Phytoplankton are very tiny, but it is the plant that gives off more oxygen than any other plant on Earth. Seaweed is a type of algae that floats on the surface of the water and has been used by people for food, and material for housing, ropes, and baskets. Kelp is an ocean plant that can reach sizes up to 250 feet. It the largest ocean plant in the world and is usually brown. Kelp grows and lives on the surface of the water, but some kelp can also be very colorful. Kelp is another kind of seaweed. It grows very quickly and also needs the energy from the Sun to survive.