여수연안 멸치어장에서 식물성 플랑크톤의 출현과 멸치 어황의 변동

Relation between chlorophyyll-a and catch of anchovy by the lift net in the coastal waters Yosu

In order to investigate the properties in distribution and movement of anchovy school caught by the lift net in the coastal waters Yosu and their relation to the environmental factors, I. e., the amount of chlorophyll-a were observed on August 1996 and from June to August in 1997 and compared with the catch of anchovy by the lift net. The results obtained are summarized as follows; 1) The amount of chlorophyll-a ranged from 4.0 to 12.0㎎/㎥ on July and from 3.0 to 15.0㎎/㎥ on August in horizontal distribution, the amount of chlorophyll-a ranged from 3.0 to 8.0㎎/㎥ on June, from 5.5 to 11.6㎎/㎥ on July, and from 6.0 to 11.1㎎/㎥ on August in daily observation of chlorophyll-a, respectively. Daily variation of the amount of chlorophyll-a was very irregulated because the position operated was changed daily. 2) Anchovy school can be presurmed, they are come from north of bay, visited and distributed through east of bay at the middle of June. Moreover, they spreaded in all bay. Then gradually, when July arrive, they go to the South the nearest the coasts, and they are outflow through the south entrance of bay at the end of August. 3) The catch of anchovy was highest on July, poor second on August, and lowest on June. The catch of anchovy increased with the amount of chlorophyll-a. A comparison of the amount of chlorophyll-a with the catch gave that the amount of chlorophyll-a had large influence on the catch, distribution and movement of anchovy school.