Notes on a serious damage to cultured oyster crops in Hiroshima caused by a unique and unprecedented outbreak of a serpulid worm, Hydroides norvegica (Gunnerus) in 1969
Arakawa, K.Y. (1971). Notes on a serious damage to cultured oyster crops in Hiroshima caused by a unique and unprecedented outbreak of a serpulid worm, Hydroides norvegica (Gunnerus) in 1969 . Venus Jap. J. Malacol. 30(2): 75-82. https://dx.doi.org/10.18941/venusjjm.30.2_75
In: Venus: Japanese Journal of Malacology. Malacological Society of Japan: Tokyo. ISSN 0042-3580, more
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| Keywords |
Hydroides ezoensis Okuda, 1934 [WoRMS]; Hydroides norvegica Gunnerus, 1768 [WoRMS]
Marine/Coastal |
| Abstract |
It is well known that several mudworm, Polydora (Polychaetous annelids) often causes a serious damage to cultured bivalves, such as oysters and pearl oysters. During the autumn of 1969, a serpulid worm, Hydroides norvegica (GUNNERUS), outbroke in oyster beds located along the coastal areas of Hiroshima Bay and the vicinities (Text-fig. 2). More than 6, 000 rafts of the oyster (Crassostrea gigas (THUNBERG)) cultured in these areas were totally damaged by bitter competition with the serpulid worms for food as well as for space (Plate 9). The 1969 cultured oyster crops in Hiroshima Bay are estimated to be 63% of the average crops (32, 000 metric tons in flesh weight), and the total damage on the 1969 crops is estimated to be about \3, 000, 000, 000, due to this unique and unprecedented outbreak of the serpulid worm. |
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