Estimation of suitable environment for nursery ground of juvenile marbled flounder, Pleuronectes yokohamae in coastal water.
1992
Kamiyama T. | Itaoka M. | Tokai T. | Sakaji H. | Aizawa Y.
The sediment condition and near-bottom environment were investigated at the coast of Hikari City, in Suo-Nada, the Seto Inland Sea, in April 1985 and March 1989. The suitable nursery ground of marbled flounder was estimated by analyzing the relationship of the results of environmental conditions and the distribution of juvenile marbled flounder settled in the study area. The environmental conditions were based on water depth, near-bottom salinity, sediment properties (mud content, total sulfide, ignition loss and ratio of C/N) and biomass of meiobenthos (nematoda, polychaeta and copepoda). Multiple regression of converted data by principal components analysis was used in analyzing the data. The predicted equation indicated that the suitable nursery ground is a shallow place, where bottom component is sandy and organic content is low, and where polychaeta of meiobenthos is abundant. In the study area, environmental conditions showed that shallow places around the river mouth were suitable for juvenile marbled flounder.
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