Abstract
There are problems of potential marine resources, potential fishing conditions and fishing conditions in situ in studying marine ecosystem.
Studies of the marine ecosystem in a ocean current may be fundamental for the purpose to analyse those problems. In the marine ecosystem, its dynamic conditions are followed by dynamics of the spacial and the nonspacial structures of the ecosystem. Owing to the author's consideration on ecological grounds, structure of the marine ecosystem may be recognizable by means of investigations of the oceanographic structure of the current system which is a factor for the spacial structure of the system. Since such structural elements as vortex movements, upwelling, horizontal advection of the coastal water are physical conditions in structure of the ecosystem, especially in the view point of marine biochemical cycle, it is reasonable that these conditions are dynamic component of the ecosystem and restrict not only spacial structure but also nonspacial structure of the ecosystem in the sea.
