Article: Food fish

The shape of the body has its own importance in order to feed the fish, a way often highly specialized. In a fish "typical", in the most common case, the mouth of the fish is opened at the front end of the body, according to a horizontal line passing through the center of the fish. Most fish have this type of terminal mouth. The fish that collect the food at the water have the dorsal surface flat, rather than convex, which allows them to swim horizontally just below the surface. From this position the surface they can see very well the food (insects, larvae floating, fragments of vegetation or small animals that swim on the surface); in these species is the terminal but the mouth turned towards the upper spoon. In contrast, fish foraging on the bottom of the sea and rivers need a mouth down and have a very flattened ventral surface of the body. The fish diet is extremely varied: from the microscopic plant and animal organisms (infusoria, plankton) until the insects and their larvae, small fish in a minute, algae, aquatic plants, fruits and even-swimming animals and birds. The size of the fish does not necessarily affect the size of the prey or food intake. It 's unusual to find in an aquarium of fish that feed by filtering water, while they are marine invertebrates that use this system for feeding. But once it is captured and transferred from its original environment in an aquarium, the whole process becomes unnatural nutrient because most of the normal food of the fish will not be available in the new artificial environment, and the fish will eat in a different way. Naturally the type of diet affects the structure of teeth, and not all fish are carnivorous, and many are vegetarians, and their teeth are designed to pull weeds and herbs from the rocks.