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are a class of fishes called Chondrichthyes. They have skeletons made of rather than . The class includes , and . Shark fin skeletons are elongated and supported with soft and unsegmented rays named ceratotrichia, filaments of elastic protein resembling the horny in hair and feathers. Originally the pectoral and pelvic girdles, which do not contain any dermal elements, did not connect. In later forms, each pair of fins became ventrally connected in the middle when scapulocoracoid and pubioischiadic bars evolved. In , the pectoral fins have connected to the head and are very flexible. One of the primary characteristics present in most sharks is the heterocercal tail, which aids in locomotion. Most sharks have eight fins. Sharks can only drift away from objects directly in front of them because their fins do not allow them to move in the tail-first direction.
There are some species of fish that can "walk" along the sea floor but not on land; one such animal is the (it does not actually fly, and should not be confused with ). The batfishes of the family (not to be confused with Batfish of ) are also capable of walking along the sea floor. , also known as a "tripodfish", stands on its three fins on the bottom of the ocean and hunts for food. The African lungfish () can use its fins to along the bottom of its tank in a manner similar to the way amphibians and land vertebrates use their limbs on land.
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Veil Tail Oscar fish - these Oscars have been bred to exhibit long fins. As you can observe by our example, the fins can become damaged quite easily. Nevertheless, they are beautiful fish with their long flowing fins that often look like silkButterfly koi originated in the mid-20th century as a result of an effort to increase the hardiness of traditional koi. Japanese breeders interbred wild Indonesian longfin river carp with traditional koi. The resulting fish had longer fins, long barbells, pompom nostrils, and were hardier than koi. These were known in Japan as "onagaoi" or "hire naga goi", or translated in English "long tail carp". Randy LeFever, the son of Wyatt LeFever, a noted breeder of koi, is credited with suggesting they looked like butterflies, a trait for which the breed is named. They are also sometimes referred to as Dragon Koi.There are at least 40 known species of flying fish. Beyond their useful pectoral fins, all have unevenly forked tails, with the lower lobe longer than the upper lobe. Many species have enlarged pelvic fins as well and are known as four-winged flying fish.Who would ever expect an angel to be a devil? In most cases, (Pterophyllum scalare) are indeed angels. They mix very well in a community aquarium — as long as you don’t mix them with fish that will nip their long, delicate fins. And I highly recommend these fish — angelfish are an all-time favorite of almost every hobbyist.
Angelfish are cichlids. Like other cichlids, they are territorial.