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I've never had a Betta fish, but I see them often.  They're the small, colorful, ray-finned fish in pet stores.  Have you ever had one?
Betta is a large genus of small, often colorful, freshwater ray-finned fishes in the gourami family (Osphronemidae).
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Betta
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Siamese fighting fish
The Siamese fighting fish ("Betta splendens"), also sometimes colloquially known as the betta, is a species in the gourami family which is popular as an aquarium fish. Bettas can be territorial fish and are prone to high levels of aggression towards each other. Two males in proximity will almost always attack each other, if they do not have the ability to escape this will usually result in the death of one or both of the fish. Female bettas can also become territorial towards each other if they are housed in too small an aquarium. It is typically not recommended to keep male and female bettas together, except temporarily for breeding purposes which should always be undertaken with caution.
Evolution of fish
The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fish lineages belong to the Agnatha, or jawless fish. Early examples include "Haikouichthys". During the late Cambrian, eel-like jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared. Most jawless fish are now extinct; but the extant lampreys may approximate ancient pre-jawed fish. Lampreys belong to the Cyclostomata, which includes the extant hagfish, and this group may have split early on from other agnathans.
Fishkeeping
Fishkeeping is a popular hobby, practiced by aquarists, concerned with keeping fish in a home aquarium or garden pond. There is also a piscicultural fishkeeping industry, as a branch of agriculture. Fish have been raised as food in pools and ponds for thousands of years. Brightly colored or tame specimens of fish in these pools have sometimes been valued as pets rather than food. Many other cultures kept fish for both functional and decorative purposes. Ancient Sumerians kept wild-caught fish in ponds, before preparing them for meals. Depictions of the sacred fish of Oxyrhynchus kept in captivity in rectangular temple pools have been found in ancient Egyptian art.
Fish fin
Fins are usually the most distinctive anatomical features of a fish. They are composed of bony spines or rays protruding from the body with skin covering them and joining them together, either in a webbed fashion, as seen in most bony fish, or similar to a flipper, as seen in sharks. Apart from the tail or caudal fin, fish fins have no direct connection with the spine and are supported only by muscles. Their principal function is to help the fish swim. Fins located in different places on the fish serve different purposes such as moving forward, turning, keeping an upright position or stopping. Most fish use fins when swimming, flying fish use pectoral fins for gliding, and frogfish use them for crawling.
Pet store
A pet store or pet shop is a retail business which sells different kinds of animals to the public. A variety of animal supplies and pet accessories are also sold in pet shops. The products sold include: food, treats, toys, collars, leashes, cat litter, cages and aquariums. Some pet stores provide engraving services for pet tags, which have the owner’s contact information in case the pet gets lost. In the USA and Canada, pet shops often offer both hygienic care (such as pet cleaning) and esthetic services (such as cat and dog grooming). Grooming is the process by which a dog or cats's physical appearance is enhanced and kept according to breed standards for competitive breed showing, for other types of competition, like creative grooming or pet tuning contests, or just to their owners taste.
Evolution of tetrapods
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes. Tetrapods are categorized as a biological superclass, Tetrapoda, which includes all living and extinct amphibians, reptiles, birds, and mammals. While most species today are terrestrial, little evidence supports the idea that any of the earliest tetrapods could move about on land, as their limbs could not have held their midsections off the ground and the known trackways do not indicate they dragged their bellies around. Presumably, the tracks were made by animals walking along the bottoms of shallow bodies of water.
Betta
Betta is a large genus of small, often colorful, freshwater ray-finned fishes in the gourami family (Osphronemidae). The best known "Betta" species is "B. splendens," commonly known as the Siamese fighting fish. All the "Betta" species are small fishes, but they vary considerably in size, ranging from under 2.5 cm (1 in) total length in "B. chanoides" to 12.5 cm (5 in) in the Akar betta ("B. akarensis"). Bettas are anabantoids, which means they can breathe atmospheric air using a unique organ called the labyrinth. This accounts for their ability to thrive in low-oxygen water conditions that would kill most other fish, such as rice paddies, slow-moving streams, drainage ditches, and large puddles.