This study is summarised as evidence for the following.

Action Category

Install a pump on or above the seabed in docks, ports, harbour, or other coastal areas to increase oxygen concentration

Action Link
Subtidal Benthic Invertebrate Conservation
  1. Install a pump on or above the seabed in docks, ports, harbour, or other coastal areas to increase oxygen concentration

    A before-and-after study in 1995–1998 in one area of seabed in Osaka Bay, Japan (Yamochi & Oda) found that installing a pump on the seabed of a port to mix seawater and increase oxygen concentration appeared to increase combined invertebrate and fish species richness and abundance, after four months. Data were not statistically tested. Species richness was seven times higher after installing the pump (14 species/survey) compared to before (7 species/survey), and abundance was 52 times higher after (11 individuals/transect) than before (0.2 individuals/transect). In May 1996, a jet stream pump system was installed on the seabed of a port with low water oxygen concentration, at 4 m water depth. One dredge net (2 m x 0.5 m, 0.7–1.5 cm mesh size) was deployed along ten 70 m transects during weekly surveys before (June–August 1996; seven surveys) and after installation (June–August 1998; six surveys). Invertebrates and fish caught were identified and counted and results presented as combined species richness and abundance.

Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read latest volume: Volume 17

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust