Fish Wallpaper

GrassTech個人化2018-10-20

價格：免費

更新日期：2018-10-20

檔案大小：17M

目前版本：1.01

版本需求：Android 4.1 以上版本

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Fish are animals that live in water. They are vertebrates, animals with backbones, and come in all kinds of shapes, sizes and colors. Fish first appeared in the oceans of the Earth about 500 million years ago, long before dinosaurs roamed our planet. Today there are tens of thousands of different kinds of fish and new species are discovered every year. Over millions of years fish have changed their features and adapted to their surroundings in order to survive.

Fish come in a wide variety of colors, shapes and sizes - there's the largest fish, the 60+ foot long whale shark, popular seafood fish such as cod and tuna, and completely different-looking animals such as seahorses, sea dragons and pipe fish. In all, about 20,000 species of marine fish have been identified.

Fish swim by flexing their bodies, forming waves of contractions along their muscles. These waves push water backward and move the fish forward.

One of the most notable features of fish are their fins - many fish have a dorsal fin and anal fin (near the tail, on the underside of the fish) that provide stability. They may have one, two or even three dorsal fins. They may also have pectoral and pelvic (ventral) fins to help with propulsion and steering. They also have a caudal fin, or tail.

Most fish have scales covered with a slimy mucus that helps protect them. They have three main types of scales: cycloid (roundish, thin and flat), ctenoid (scales that have tiny teeth on their edges) and ganoid (thick scales that are rhomboid in shape).

Fish have gills for breathing - the fish inhales water through its mouth, which passes over the gills, where hemoglobin in the fish's blood absorbs oxygen.

Fish may also have a lateral line system, which detects movement in the water, and a swim bladder, which the fish uses for buoyancy.

The fishes are divided into two superclasses: Gnathostomata, or vertebrates with jaws, and the Agnatha, or jawless fishes.

Fish live all over the world, in the cold water of the Arctic as well as in warm tropical water around the equator. Areas rich in fish are especially around the coastal shelves of the Northern Atlantic, the Caribbean Sea and the western Pacific Ocean.

Most of the world’s fish live in salt water. They preferably live in areas where warm and cold currents meet. Some types live in the warm tropical waters around coral reefs.

Most fish eat meat, preferably other fish. They also eat plants, worms and algae. The largest fish in the world consume huge masses of plankton.

Fish have to protect themselves from being eaten by other fish. They blend into their surroundings by changing their color or their shape. Some fish are very fast swimmers and get away from their enemies very quickly. Others release poisonous substances from their spines.

Although most fish are harmless to humans some will attack if provoked. Sharks attack humans if they smell blood or if people make uncontrolled movements. Piranhas live in the waters of the tropical rainforest. They attack their victims with their sharp teeth and tear their flesh apart

****Features****

** Easy to download and free.

** Fish wallpaper doesn't need the internet connection to work well