To infer the vertical distribution of various fishes, the author pickes up such data that allows to deal with both otter and pair trawlers, various fishes, and fishing operations made concurrently under equivalent conditions in similar parts or sections of a fishing ground. Such data has appeared in the year 1953 regarding the monthly catch by otter trawl in the East China Sea and the Yellow Sea. They seem to be sufficiently available by reason of their greatness for various fish species. From these data were calculated out the ratio of fishing, the mean catch per drag, C
OT and C
PT for otter trawl and pair trawl, respectively, the value of C
OT/C
PT, and the converted value of C
OT/C
PT for equivalent sweep area (Table 1 and Fig. 1).
Through such numerations the author has arrived at the conclusion that the snapper,
Taius tumifrons (T. & S.), the crimson seabream,
Evynnis japonica TANAKA, the long tailed snapper,
Nemipterus virgatus (HOUTTUYN), the lizard fish,
Saurida tumbil (BLOCH), swim at shallow depths while the ribbon fish,
Trichiurus lepturus LINNÉ, the large croaker,
Argyrosomus japonica (T. & S.), swim at greater depths very near the sea bottom and the croaker,
Miichthys imbricatus (MATSUBARA), the yellow croaker,
Pseudosciaena manchurica (J. & T.), the black croaker,
Argyrosomus nibe (J. & T.), the flat head,
Ptatycephalus indicus (LINNÉ), are distributed at the height of about 1 meter from the sea-bottom.
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