| By using such methods as were used in fish ecology, behaviouristics and mariculture disciplines, a study on the behavioral characteristics of fishes in the deep water sea cages was done. Altogether fives fishes were studied, with results showing that the endurance ranking when exposing to the air was Sparus macrocephalus, Pagros major, Lateolabrax japonicus,
Sciaenops ocellatus and Pseudosciaena crocea. P. crocea lived in the middle and lower water near cage net, schooling and didn't fight
with each other. However, Sciaenops ocellatus fought with each other fiercely and schooled everywhere in the middle and lower waters. Lateolabrax japonicus also lived in the middle and lower waters, rarely schooled but fought fiercely. Lateolabrax japonicus distributed ne
ar the ridge of lower waters and cage bottom, rarely schooled and also fought with others, so did Sparus macrocephalus. The five species took on
obvious food taking rhythm and were of tidal regularity. There were two food taking peaks in the period of slack tide near at dawn and dusk. They had a selectivity to the food and strong tolerance to starvation. The lower the water temperature, the stronger the tolerance to starvation. The food taking intensity was related to feeding methods. It assumed to be a positive correlation to water temperatures, peaking in July and August and going to its valley in February. There was not apparent difference of activity whether in the day or not. When at swift water condition, almost all the fishes habited in the bottom and near bottom ridge; otherwise, they would swim everywhere. The ability concerning wind, flow and wave resistance were different, with S. ocellatus being best, Lateolabrax japonicus the second and so on with Pseudosciaena crocea, Sparus macrocephalus, Pagros major.