Abstract: The present invention provides a nozzle assembly for use in a dissolved gas flotation system, comprising: a nozzle having at least one inlet and at least one outlet, the at least one inlet and the at least one outlet being in fluid communication; and a shroud comprising a first shroud portion, the shroud being arranged, in use, to at least partly receive and confine a gas saturated fluid stream emitted from at least one nozzle outlet; the nozzle assembly being arrangeable in use within an ambient fluid, such that the gas saturated fluid stream forms bubbles within the ambient fluid; characterised by: the shroud comprising at least one aperture for, in use, allowing the ambient fluid to communicate with an interior of the shroud.