Journal of Shellfish Research, December 15th, 2004
ABSTRACT Landings of abalone (H. discus, H. gigantea, and H. madaka) in Chiba Prefecture, Japan exceeded 700 t in 1966 and fluctuated between 600-800 t until 1978. The landings started to decline in 1979 and reduced to less than 100 t in 1997. Although landing of H. discus has been slightly increased since 2000, that of H. gigantea abalone is still decreasing. We analyzed the data of investigations on decline in abalone landings and have come up with "environment theory", "over-fishing theory" and "disease theory." In the environment theory various factors were considered, such as biomass de...
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