Period and Interval
|Research Area||The Natori River estuary and off Yamamoto in Sendai Bay
1. Survey on environmental conditions estuary and simulation on environments of fishery ground.
Continuous observation of salinity, temperature and depth.
Analyses for the relation between changing process in temperature and salinity and tide, weather and geographical form.
Analyses for the relation between stream regime and environment of bottom.
2. Study on distribution of bivalves, the Manila clam, Brackish water clam and Nuttallia olivacea.
Survey on the population density, shell size composition, ecological characteristics and environmental conditions.
3. Study on the mechanism of maintenance of Ayu population.
Analyses on characteristics of fishery ground and ecological characteristics of Ayu.
4. Estimation of the condition of stock of the Surf clam population.
Survey on the population density of the Surf clam and the estimation of the condition of stock.