Abstract
Ohara and Katagai are famous as the bases for sardine purse seine fishery on the east coast of Chiba prefecture, but they are mutually different in that while the former is favoured by the facility of fishing harbour, the latter is not so because of the shallowness of the adjacent water up to a great distance away from the shore.
This report exermienes as to whether there can be found any difference in fishery achivement which has arisen certainly from the presence or absence of available fishing harbour, on the basis of the data supplied by the fishery associations of Ohara and Katagai.
1) The fishing fleet from Ohara is able to go fishing about 3 days more per month than the fleet of Katagai and this may be accounted for by the fact that Ohara only is furnishedwith fishing harbour.
2) From 1955 to 1957, the catch per day attained by Ohara fleet continued to be far greater than that attained by Katagai fleet. This may be due to that the tonnage of seine boats and the size of nets, which depend naturally on the presence or absence of fishing har-bour, were larger as shown in Table 1, in the case of Ohara fleet as compared with Katagai fleet.
