カキ種苗生産場における生態学的研究-III : 仙台湾北部海域における幼生の出現
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概要
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The bays located in the northern area of Sendai Bay are better known for their largest production of oyster seed(Crassostreagigas) in Japan. In the present paper the authors report results of investigations carried out on the dispersion and accumulation of planktonic oyster larvae together with hydrographic conditions that prevailed from 1962 to 1970 in the northern area of Sendai Bay. 1. The northern area of the Bay can be divided into three sectors in respect to the influence of (1) fresh water (2) oceanic sea water and (3) mixed waters of the two. 2. During the period of survey oyster larvae were distributed in the main spawning regions of the northern area of the Bay and also dispersed off-shore. Oyster larvae abundance appeared especially decreased in the area influenced by oceanic sea water. 3. The most abundant appearance of larvae occurred when water temperature and specific gravity reached 25-27°C and σ1522.00-25.00 respectively. 4. Environmental factors influencing tion and accumulation of larvae are affected by drifting currents, coastal currents, fresh water, and tidal currents. 5. The dispersion and accumulation of the planktonic oyster larvae in the northern area of the Bay are influenced by the interaction of meteorologic and hydrographic conditions. Considering the conditions that have been mentioned above, we have concluded as follows; it is important for the seed oyster production industry to establish predicting techniques for oyster seed collection and to plan for the exploitation of the off-shore regions of Sendai Bay.
- 公益社団法人 日本水産学会の論文