Fish are members of poikilothermic (cold-blooded) vertebrates that live in water and breathe through gills. Fish are the most diverse group of vertebrates with more than 27,000 species worldwide. Taxonomically, fish belong to a paraphyletic group whose kinship relationship is still debated; fish are usually divided into jawless fish (class Agnatha, 75 species including lampreys and hags), cartilaginous fish (class Chondrichthyes, 800 species including sharks and rays), and the rest are classified as bony fish (class Osteichthyes). Fish in various local languages are called iwak (jv, bjn), jukut (vkt). Fish range in size from whale sharks measuring 14 meters (45 ft) to stout infantfish measuring only 7 mm (approximately 1/4 inch). inches). There are some aquatic animals that are often considered "fish", such as whales, squid and mermaids, which are not actually classified as fish.
Until now, fish are generally consumed directly. Processing efforts have not been done much except for salted fish. Fish can be processed into various products such as dried fish, fish jerky, shredded fish, fish crackers, salted fish, kemplang, fish balls and fish blood meal as plant fertilizer and fish feed.
Fish are a paraphyletic group which means that any class containing all fish will also include non-fish tetrapods. On this basis, groupings like the Pisces Class, as in the past, are not worth using anymore.
The following are the units that include all vertebrates commonly referred to as fish:
Subclass Pteraspidomorphi (primitive jawless fish)
(unstated) Cephalaspidomorphi (primitive jawless fish)
(not status) Hyperoartia
Infraphylum Gnathostomata (large-mouthed vertebrates)
Class Placodermi (shield fish, extinct)
Class Chondrichthyes (cartilaginous fish: sharks, rays)
Class Acanthodii (thorny shark, extinct)
Superclass Osteichthyes (true bony fish: includes almost all of today's important fish)
Class Actinopterygii (fan-finned fish)
Class Sarcopterygii (fleshy fin fish / lobe-finned fish)
Subclass Coelacanthimorpha (coelacanths)
Subclass Dipnoi (lung fish)
Fish can be found in almost all large "pools" of water, both fresh water, brackish water and salt water at varying depths, from near the surface of the water to several thousand meters below the surface of the water. However, a lake that is too salty like the Great Salt Lake cannot support fish. There are several species of fish cultivated and kept for decoration in the aquarium, we know as ornamental fish.
Fish is an important food source. Other aquatic animals, such as molluscs and crustaceans are sometimes considered fish when used as a food source. Catching fish for the purpose of eating small amounts or sport fishing is often referred to as fishing. The results of fishing worldwide each year amount to about 100 million tons per year.
Overfishing is an English term to describe overfishing. This phenomenon is a threat to various fish species. On May 15, 2003, the journal Nature reported that all large marine fish species had been systematically overfished to less than 10% of the amount in 1950. The authors of the journal article suggested drastic reductions in fishing and the reservation of marine habitats. around the world.
Fish content is rich in benefits because it is a source of protein for the body. In addition, it turns out that fish also contains various substances that are very beneficial for health. The nutritional content of fresh fish and its benefits include:
Omega 3, for the process of brain development in the fetus and is important for development