Twenty-six species in 11 families of polychaetes were found among fouling organisms on the floats of oyster-culture rafts, which were wrapped with chemical-fiber cloth, and have been kept under water for more than three years before examination in Kure, the Seto Inland Sea, Japan. The polychaete community included a spionid species, Polydora hoplura, which is known as a pest for bivalve and gastropod aquaculture. As a means for pest control to manage Polydora infection, a possibility should be taken into account that aquaculture rafts can be part of sources of the pests.
The osteological features of the cyprinid fish, Nipponocypris temminckii are examined and described for studies on fossil cyprinid fishes found in East Asia. As a result of this study, it was found that the pharyngeal, opercle, quadrate‐pterygoid fenestra urohyal, and dorsal fin skeleton of N. temminckii similar to those of Candidia barbata. However sensory canals of the parietal, infraorbital 5 and the dentary of N. temminckii differ from those of C. barbata.