Neptune

The FI-03 Neptune series of B.O.W.s were created specifically to test the effects of the experimental T-Virus on sea creatures.

History
During the viral outbreak in the Arklay Research Facility, a mother Neptune and her spawn were inadvertently released from their water tanks by a scientist, who had suddenly "gone mad" and destroyed the tanks, badly flooding the entire Aqua Ring. These sharks would soon die after the water was drained out of the tank.

Two Neptunes were encountered swimming in the Circular River bordering the Raccoon University; precisely where they came from is unknown, though these two were almost certainly killed when Raccoon City was destroyed. It is unknown if any more were in the river, or that could have managed to get outside the quarantine zone. The fact that the sharks were swimming in freshwater shows an apparent by-product of their T-Viral infection. That, or they were bull sharks (which can live in fresh water) infected with the T-Virus.

B.O.W.
The Umbrella researchers were disappointed with the creation of Neptune. The T-Virus did not significantly improve the already impressive strength of the Great White Sharks, and they were still helpless out of the water.

Despite these setbacks however, Umbrella seemed to have allowed re-development of the series in the early 21st Century, with the Umbrella Caucasus Research Facility having at least 3 in 2003.

Trivia

 * In Roman mythology, Neptune was the god of the sea.
 * Neptunes are noticeably larger in the REmake than in the original.
 * The Neptunes can instanly kill the players by eating them in Resident Evil remake and Outbreak.