Survey on harmful algae in the coastal area of southern Iwate Prefecture

Fiscal Year

2015

Title

Survey on harmful algae in the coastal area of southern Iwate Prefecture

Project and Theme

Project 1. Study on ecological succession of fisheries ground
Representative Organization: Tohoku University
Theme5. Studies on the coastal environment and marine resources in the southern part of Iwate Prefecture
Representative personRyusuke Kado
OrganizationKitasato University
DepartmentSchool of Marine Biosciences

Research Information

Period and Interval
2015/04/01 - 2016/03/31
Every one / two month
Research Area
Ofunato Bay and Okirai Bay
Research Point Table
Point
Coordinates39.047904,141.731191
Coordinates39.089486,141.841054
Category
Field survey
Overview
In the Sanriku coast, aquaculture such as bivalves have been developed, however, shellfish poison phenomenon associated with the occurrence of toxic micro-algae has become one of the most serious problems. In Ofunato Bay, abundance of cyst of dinoflagellate that cause paralytic shellfish poison increased significantly, and degree of shellfish poison has become a serious problem. On the other hand, amnesic shellfish poisoning (ASP) is caused by domoic acid (DA) generated by Pseudo-nitzschia diatom, cause poisoning by poison accumulates in fish and shellfish through the food chain. P. multiceries, a highly toxic species is distributed around Sanriku coastal area, and scallop and mussels are poisoned by this diatom. The occurrence of these harmful algae is serious problems in fisheries. The present study aimed that to reveal the abundance and distribution of these harmful algal cysts and occurrence and toxicity of ASP diatom.

Investigation Item and Data Acquisition

Investigation ItemData Acquisition
PSP toxin-producing dinoflagellate Alexandrium tamarenseHorizontal distribution and concentration of the cysts
ASP toxin-producing diatom Pseudo-nitzschia multiseries and Nitzshia navis-varingicaToxicity of the plankton net tow sample and bivalves Toxin production characteristic of P. multiseries and N. navis-varingica

Reference

Related Observation Result
FY2015 Survey on harmful algae in the coastal areas of southern Iwate Prefecture

Person in charge of Investigation

Representative personYuichi Kotaki
OrganizationKitasato University
DepartmentSchool of Marine Biosciences
Representative personYuichiro Yamada
OrganizationKitasato University
DepartmentSchool of Marine Biosciences

Keywords

Fiscal Year2015
OrganizationKitasato University
CategoryField survey
Research AreaSouth Sanriku
DisciplineOcean environment -> Creature
Ocean biology / Ocean ecology -> Biological classification
Ocean biology / Ocean ecology -> Biomass
Ocean biology / Ocean ecology -> Physiology
Ocean biology / Ocean ecology -> Ecology
Ocean biology / Ocean ecology -> Mollusks
Ocean biology / Ocean ecology -> Plankton
Topography / Geology / Geophysics -> Bottom sediment