Tetra are species of small freshwater fish from Africa, Central America and South America belonging to the biological family Characidae and to its former subfamilies Alestiidae (the "African tetras") and Lebiasinidae. The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal fin and caudal fin. Many of these, such as the neon tetra (Paracheirodon innesi), are brightly colored and easy to keep in captivity. Consequently, they are extremely popular for home aquaria.

Tetra is no longer a taxonomic, phylogenetic term. It is short for tetragonopterus, the former genus name of this group of fish, which is Greek for "square-finned" (literally, square-winged).

Because of the popularity of tetras in the fishkeeping hobby, many unrelated fish are commonly known as tetras, including species from differing families. Even fish that are vastly different may be called tetras. For example, payara (Hydrolycus scomberoides) is occasionally known as the "sabretooth tetra" or "vampire tetra".

Neill Blomkamp (born 17 September 1979) is a South African-Canadian film and advertisement writer and director. Blomkamp employs a documentary-style, hand-held, cinéma vérité technique, blending naturalistic and photo-realistic computer-generated effects. He is best known as the co-writer and director of critically acclaimed District 9, his only feature film to date. He is based out of Vancouver, British Columbia.

Time named Blomkamp as one of the 100 Most Influential People of 2009. Forbes magazine named him as the 21st most powerful celebrity from Africa.

Blomkamp was born in Johannesburg, South Africa. At 16, he met Sharlto Copley who had also attended Redhill High School in Johannesburg. Copley provided Blomkamp with the use of computers at his production company in order to pursue his passion and talent for 3D animation and design - in return, Blomkamp assisted Copley in creating 3D work for pitches on various projects. His family moved to Vancouver when Blomkamp was 18, where he enrolled in Vancouver Film School. In 2003, Blomkamp was hired to illustrate photo-real future aircraft for Popular Science's "Next century in Aviation" and in 2004 was hired to illustrate "The Future of the Automobile". Blomkamp worked as a visual effects artist at The Embassy Visual Effects in Vancouver as well as Rainmaker Digital Effects. Blomkamp was signed by Toronto commercial house Spy Films.