Suitable oyster culture density in Oginohama Bay, Miyagi, Japan

Yutaka Okumura, Akatsuki Nawata, Hiroshi Ito, Akio Oshino, Motoyuki Hara

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

We investigated regular oyster dietary conditions, and shellfish and periphyton growth from 2013 to 2014 in Oginohama Bay, Miyagi Prefecture, Japan. We calculated phytoplankton biomass in the aquaculture areas minus the total phytoplankton filtration by oysters and periphyton. We estimated that the suitable oyster culture density is when that value is >0. The mass balance of phytoplankton biomass for food availability increased from January through April, and decreased from May to June. Although the mass balance of phytoplankton biomass fluctuated after June, no significant changes were seen until December. Therefore, the risk of a decrease in oyster food was thought to increase after June. The mass balance of phytoplankton biomass in both low (360 ropes x 25masters x 10ind./master) and high (400 ropes x 30 masters x 15ind./master) culture density (approximately 450 oyster longline facilities) was always >0 after the tsunami. The number of longline facilities before the 2011 tsunami (approximately 1,100) did not negatively impact the oyster food supply if culture density was low. However the mass balance of phytoplankton biomass under high culture density before the tsunami was calculated as negative from June to August and from October to November. We speculate that an increase in the number of longline facilities and high-density culture would result in a decrease in oyster food. Food availability under low culture density before the tsunami (1,118 longline facilities x 360 ropes x 25 masters x 10 ind./master) was the most suitable, because the mass balance of phytoplankton biomass was >0, and oyster density was the highest of the four conditions.

Original languageEnglish
Title of host publicationOceanography Challenges to Future Earth
Subtitle of host publicationHuman and Natural Impacts on our Seas
PublisherSpringer International Publishing
Pages351-363
Number of pages13
ISBN (Electronic)9783030001384
ISBN (Print)9783030001377
DOIs
Publication statusPublished - 2019 Feb 15

Keywords

  • Japan
  • Oginohama bay
  • Oyster culture
  • Oyster density
  • Phytoplankton biomass

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)
  • Engineering(all)

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