In Asia the carp also symbolizes good luck, health and long life, and in Japan it became the symbol of Tango no Sekku, the Boys' Day, celebrated today, on May 5th.
To honor their sons, around the Tango no Sekku celebrations, the Japanese families use koinobori decorations, beautiful and colorful carp-shaped wind socks. The biggest carp represents the father, the next one the mother and so on...
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 55mm
Aperture: F/5.6
Shutter Speed: 1/1000s
ISO Sensitivity: ISO 200