Control of dissolved oxygen levels of water in net pens for fish farming by a microscopic bubble generating system

Sarawut Srithongouthai, Akira Endo, Akihiro Inoue, Kyoko Kinoshita, Miho Yoshioka, Ayako Sato, Takaaki Iwasaki, Ichiro Teshiba, Hisatsune Nashiki, Daigo Hama, Hiroaki Tsutsumi

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)485-493
Number of pages9
JournalFisheries Science
Volume72
Issue number3
DOIs
Publication statusPublished - 2006 Jun
Externally publishedYes

Keywords

  • Dissolved oxygen
  • Fish farming
  • Microscopic bubble
  • Online vertical profiling system
  • Red sea bream

ASJC Scopus subject areas

  • Aquatic Science

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