TY - JOUR
T1 - Control of dissolved oxygen levels of water in net pens for fish farming by a microscopic bubble generating system
AU - Srithongouthai, Sarawut
AU - Endo, Akira
AU - Inoue, Akihiro
AU - Kinoshita, Kyoko
AU - Yoshioka, Miho
AU - Sato, Ayako
AU - Iwasaki, Takaaki
AU - Teshiba, Ichiro
AU - Nashiki, Hisatsune
AU - Hama, Daigo
AU - Tsutsumi, Hiroaki
PY - 2006/6
Y1 - 2006/6
N2 - A microscopic bubble generating system (MBGS) has been developed to control dissolved oxygen (DO) levels suitable for fish farming. The MBGS has been tested to confirm its capability in net pens. Water conditions in a fish farm were monitored every two hours from June to October 2004 by setting an online vertical profiling system (OVPS) close to the net pen. DO in the net pen water decreased to physiologically stressful levels for the fish during the night (4.84-5.51 mg/L), while the DO was kept in saturated conditions during the day, due to oxygen supply from phytoplankton. The MBGS was operated from the evening to the morning of the next day for 16 h, to successfully create DO-saturated conditions in the net pen water at night. By using microscopic bubbles during the warm seasons, DO levels in the net pen water could be improved to a level suitable for fish farming. However, the low DO levels (<5.0 mg/L) of the bottom water occasionally extended to the net pen layers, despite the supply of microscopic bubbles to the water. To maintain the DO of the net pen water at levels suitable for fish farming, DO supply to the net pen water and the bottom water needs to be increased, and the organically enriched sediment just below the net pens needs to be treated.
AB - A microscopic bubble generating system (MBGS) has been developed to control dissolved oxygen (DO) levels suitable for fish farming. The MBGS has been tested to confirm its capability in net pens. Water conditions in a fish farm were monitored every two hours from June to October 2004 by setting an online vertical profiling system (OVPS) close to the net pen. DO in the net pen water decreased to physiologically stressful levels for the fish during the night (4.84-5.51 mg/L), while the DO was kept in saturated conditions during the day, due to oxygen supply from phytoplankton. The MBGS was operated from the evening to the morning of the next day for 16 h, to successfully create DO-saturated conditions in the net pen water at night. By using microscopic bubbles during the warm seasons, DO levels in the net pen water could be improved to a level suitable for fish farming. However, the low DO levels (<5.0 mg/L) of the bottom water occasionally extended to the net pen layers, despite the supply of microscopic bubbles to the water. To maintain the DO of the net pen water at levels suitable for fish farming, DO supply to the net pen water and the bottom water needs to be increased, and the organically enriched sediment just below the net pens needs to be treated.
KW - Dissolved oxygen
KW - Fish farming
KW - Microscopic bubble
KW - Online vertical profiling system
KW - Red sea bream
UR - http://www.scopus.com/inward/record.url?scp=33745032076&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33745032076&partnerID=8YFLogxK
U2 - 10.1111/j.1444-2906.2006.01176.x
DO - 10.1111/j.1444-2906.2006.01176.x
M3 - Article
AN - SCOPUS:33745032076
VL - 72
SP - 485
EP - 493
JO - Fisheries Science
JF - Fisheries Science
SN - 0919-9268
IS - 3
ER -