Title The Effect of the Methods of Farming on the Environment and Growth of Cultured Red Sea Bream, Pagrus major
Authers Takashi UEDE
Keywords aquaculture, feeding frequency, rearing density, red sea bream, waste feed
Citation Bull. Fish. Res. Agen. No.29, 29-38, 2010
Abstract
The environment of fish farming areas and aquaculture production are considered to be closely related. Therefore, to establish the efficient use of fish farming grounds, I conducted a research on the subjects in conjunction with the rearing of red sea bream.
The presence of waste feed is assumed to provide the majority of the total particulate nitrogen discharged. The primary cause of eutrophication of fish farming grounds is excessive loading of nitrogen and phosphorus. Therefore, reducing waste is an important countermeasure to excessive nitrogen discharge. The chemical characteristics of phosphorus are different from those of nitrogen. Therefore, different measures are required to reduce phosphorus discharges. In addition, it is suggested that rearing fish at low density is good for the growth of red sea bream, though the accumulation of more data is necessary before a clear conclusion can be reached. Furthermore, mortality caused by Edwardsiella decreases when fish are reared at low density. Thus, low density rearing is thought to be effective in reducing disease problems.
URI http://www.fra.affrc.go.jp/bulletin/bull/bull29/4.pdf