Application of Water Quality Data to Estimate the Cultured Oyster Biomass in Hiroshima Bay: Estimation of the Cultured Oyster Biomass.

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The cultured oyster biomass was estimated using biomass model, which was composed of the variables of growth, mortality, oyster fresh meat weight (FMW) and oyster numbers. Oyster growth and mortality were estimated using multiple linear equations composed of water quality variables. Results of the present study showed that actual growth was best modeled using an equation composed of difference values between two successive months of chlorophyll a, salinity and dissolved oxygen. The cumulative mortality estimated by the equation, which was composed of the variables FMW, annual minimum values of temperature, DO and chlorophyll a, also well simulated the observed mortality. The cultured biomass of oysters in different oyster culture areas (Atada, Miyajima, Hiroshima and Ondo) were estimated according to the culture techniques (Ikistu, Yokusei and Nokoshi). The results showed that the cultured biomass in all areas increased up to the maximum at the beginning of harvest season, and dropped sharply due to harvesting. The estimated growth and cumulative mortality of oyster were not much different between areas, indicating that a difference of oyster biomass in each culture area was significantly depended on the number of cultured oysters. Thus, this approach provides quantitative information of the cultured biomass of oysters in Hiroshima Bay which has been difficult to monitor directly in the culture area.
社団法人日本水産学会の論文