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Fujimoto A.,Hiroshima University | Kondo S.-I.,Niigata Prefectural Fisheries and Marine Research Institute | Nakao R.,Niigata Prefectural Fisheries and Marine Research Institute | Tomaru Y.,Japan National Research Institute of Fisheries And Environment of Inland Sea | And 2 more authors.
Japan Agricultural Research Quarterly | Year: 2013

In autumn 2009, the first outbreak of the shellfish-killing dinoflagellate Heterocapsa circularisquama bloom was recorded in a small lagoon, Lake Kamo, located on Sado Isl., Niigata Prefecture, Japan. At the time, the fisheries damage on the oyster culture due to the bloom was estimated at about JPY 190 million. Also in summer 2010, H. circularisquama formed a bloom in Lake Kamo, but in this case, no oyster kill was recorded. In the present study, we measured the temporal change in the abundance of viruses causing lysis of H. circularisquama and compared it with the host dynamics. We checked the host specificity and virus sensitivity of the isolated virus clones and host clones, respectively. Different types of host and virus clone dominantly coexisted in this lake, and the intraspecies host specificity of each HcRNAV clone isolated in Lake Kamo, 2010, agreed well with the host range predicted based on thededuced amino acid sequence of the major capsid protein (MCP). Considering the contemporary appearance of the host and virus, viralinfection was assumed to be one of the factors affecting the dynamics of H. circularisquama population in this lake. Source


Kondo S.-I.,Niigata Prefectural Fisheries and Marine Research Institute | Nakao R.,Niigata Prefectural Fisheries and Marine Research Institute | Iwataki M.,Nagasaki University | Sakamoto S.,Fisheries Research Agency | And 3 more authors.
Nippon Suisan Gakkaishi (Japanese Edition) | Year: 2012

Lake Kamo is a small brackish lagoon located in Sado Island, Niigata, Japan (38°06′N, 138°44′E) and is famous for cultivation of the Pacific oyster Crassostrea gigas. In autumn 2009, a dinofiagellate Heterocapsa circularisquama formed a bloom in this lake, causing mass mortality of a considerable proportion of the cultured Pacific oysters and fisheries damage estimated to be 190 million Japanese yen. Although the origin or cause of entry of the H. circularisquama population into Lake Kamo is unknown, heavy stirring due to a large typhoon is considered to be a possible trigger of its blooming. This was the first attack by H. circularisquama in this lake; prior to this bloom, the northern limit of the distribution range of H. circularisquama had been Obama Bay, Fukui, Japan (35°50′N, 135°72′E). A H. circularisquama bloom recurred in Lake Kamo in the summer of 2010, although it did not cause considerable damage to cultured oysters. This phenomenon is considered to be a typical case of the northward expansion of harmful algae in the Northern Hemisphere. Source


Sarker A.,Sunway Business | Ikeda T.,Niigata Prefectural Fisheries and Marine Research Institute | Abe T.,Fukushima University | Inoue K.,Fukushima University
Ecological Economics | Year: 2015

Ostrom (1990) challenged the traditional belief that commons management inevitably requires state ownership or privatization and instead established the notion of user self-governance. This notion, a third policy option for managing the commons, entails little or no state involvement. Under this notion, Ostrom developed eight design principles to which self-governing institutional arrangements adhere, while the role of the state is minimal. This article seeks to establish whether design principles characterize such institutional arrangements when the role of the state is accommodated explicitly within the principles. Drawing on a case study of present-day management of Japan's community-based coastal fisheries commons, our study shows that the design principles can better characterize self-governing institutional arrangements when the state adopts a pro-user self-governance role that provides strategic support for users, but neither takes ownership of the commons nor participates in engineering the institutional arrangements. © 2015 Elsevier B.V. Source

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