title: Carbon Monoxide Production by a Bathypelagic Siphonophore.
abstract: A physonectid siphonophore, Nanomia bijuga, associated with a verticallymigrating deep scattering layer, has been observed with a gasfilled float at depths in excess of 300 meters in the sea. This implies that gas is secreted and maintained in the pneumatophore against a diffusion gradient of 30 atmospheres or more. Analysis of the enclosed gases revealed concentrations of carbon monoxide exceeding 90 percent. Necessary voiding of this gas during a vertical ascent of 300 meters could give rise to a transient population of bubbles which would act as sound-reflecting targets.
authors.forename: G V
authors.initials: GV
authors.lastname: Pickwell
authors.forename: E G
authors.initials: EG
authors.lastname: Barham
authors.forename: J W
authors.initials: JW
authors.lastname: Wilton