Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Use of a pump system helps enhance conditions for fish and crustaceans in the Port of Sakai-Semboku, Kansai region, Japan

Published source details

Yamochi S. & Oda K. (2002) An attempt to restore suitable conditions for demersal fishes and crustaceans in the Port of Sakai-Semboku, north Osaka Bay, Japan. Aquatic Ecology, 36, 67-83


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

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

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.

(Summarised by Anaëlle Lemasson)