东、黄海鱼是鱼集群分布模式的研究

根据７个冬季变水层拖网瞄准捕捞越冬鱼是鱼平均小时产量统计和探鱼仪鱼群映象纪录资料，研究了鱼是鱼集群分布模式和集群密度。鱼是鱼集群分为表层型、中层型和近底层型３种分布模式。１４种典型集群映象有捕捞生产价值。３种模式的鱼是鱼集群密度是：中层型高于近底层型，近底层型高于表层型。使用５２０目×６００毫米变水层拖网瞄准捕捞中层型集群鱼是鱼平均小时产量５．０～１４．０吨、近底层型３．６～４．５吨和表层型２．３～３．０吨

STUDIES ON THE DISTRIBUTION PATTERN OF JAPANESE ANCHOVY IN YELLOW SEA AND EAST CHINA SEA

The dist ribut io n pat terns of Japanese anchovy w ere studied based on the data o f aver age catch per ho ur and reco rding o f echo tra ce o f ancho vy during 7 w inter se asons. The dist ribut ion patterns of co ncent rated anchovy ca n be classif ied as sur face, middle and near bot tom laye rs. 14 typical reco rds of echo t races are useful fo r comme rcial f ishing. The distr ibutio n density o f middle layer is the highest , the density of near bot tom layer is higher than surface layer . The av erage catch per ho ur f rom middle layer, nea r bo t tom layer and sur face layer pat tern by pe lagic tr aw l w ith 520mesh X 600mm net w ere reported to be 5. 0~ 14. 0t , 3. 6~ 4. 5t and 2. 3~ 3. 0t r espect ively.