Abstract
Biological morphology of marine organisms has been measured and observed with preserved specimen. Especially, specimen of molluscan Octopus is a type which deformed and shrinked, we cannot see the original form. Then, I tried to apply non-invasive medical imaging techniqhes to marine biological morphology. I selected Octopus vulgaris as the first target. Ultrasonography was the most successful method for visualization of its organs in motion and water flow by jetting. Inner organs as ovary, heart, gill, intestine, liver, baccal mass, brain case and mantle-funnel complex in respiration were clearly observed. It is demonstrated that ultrasonography is so useful in marine biological morphology and fishery biology.
