Although a siphonophore appears to be a single organism, each specimen is actually a colony composed of many individual animals. Most colonies are long, thin, transparent pelagic floaters. Some siphonophores superficially resemble jellyfish. Each part is an individual, but their integration with each other is so strong that the colony attains the character of one large organism. Indeed, most of the individual animals are so specialized that they lack the ability to survive on their own.
One very beautiful Siphonophores is know as «the Hula-shirt – Physophora hydrostatica». It lives normally deep but can be seen in Saltstraumen when it is pushed up by the currents. It is recognized from the silver coulored bubble shaped top with a shirt like section underneath. Stay away from the finger like parts, since they can give you a sting, rather nasty one. The Hula-shirt colony can grow up to 10-12 cm.
Please observe that two of the pictures contain also the reflection of the colony in the surface above them.