The early bird registration deadline has been extended to June 2nd!!

  1. How to register
  2. Participation Registration Period
  3. Registration Fee
  4. Accompanying person registration fees include
  5. Session Topics
  6. About GALA Dinner
  7. Cancellation policy
  8. About Abstract
  9. Other inquiries

How to register

Please register through the Amarys registration system.

Current ISSHA members are entitled to a reduced registration rate. For obtaining this reduced rate, your membership number is required during the registration process. If you are not a current member and would like to receive the reduced rate, please first register for or renew your ISSHA membership at using Google Chrome at least ONE WEEK before your ICHA2023 registration.
If you are not an ISSHA member and plan to register for the membership, please enter “####” in the ISSHA membership number field during your ICHA20 registration process.

Participation Registration Period

  • Early Registration : 14. Feb. 2023 - 19. May 2. June 2023
  • Late Registration:20. May 3. June 2023 - 30. Sep. 2023

※ If you wish to present abstracts, please submit your abstracts by June 19.

Registration Fee

Early bird registration
(14-Feb~ 19-May 2-June)
Late registration
Regular Participant
(ISSHA member)
JPY 85,000 - JPY 95,000 -
Student Participant
(ISSHA member)
JPY 50,000 - JPY 55,000 -
Regular Participant
(Non member)
JPY 102,000 - JPY 114,000 -
Student Participant
(Non member)
JPY 65,000 - JPY 71,000 -
Accompanying person JPY 22,000 -

Registration fees include

  • Admission to all scientific sessions
  • Book of abstract (PDF)
  • Conference bag containing conference materials
  • Attendance to Ice breaker
  • Attendance to Welcome reception.
  • Attendance to ISSHA auction
  • Lunches and coffee breaks
  • Registration fee payment receipts
  • Official Attendance certificate
  • Consumption tax

Accompanying person registration fees include

  • Conference bag
  • Attendance to Ice breaker
  • Attendance to Welcome reception.
  • Registration fee payment receipts (Invoices).
  • Consumption tax

Accompanying persons do not have any access to the conference scientific program.

Session Topics

  1. Ecology
  2. Biology and biogeography
  3. Community/Species interactions
  4. Taxonomy
  5. Microbiomes and omics
  6. Prediction and modeling
  7. Monitoring and mitigation
  8. Ciguatera and benthic HABs
  9. Ichthyotoxic HABs
  10. Cyanobacterial HABs
  11. Toxins, biosynthesis and detection methods
  12. Toxicology
  13. Surveillance and management
  14. HABs in a changing world
  15. Socio-economic impacts
  16. Emerging issues

About GALA Dinner

Please note that the Gala dinner on Nov.10 is not included in the registration fee and can be booked as part of the registration process.

Cancellation policy

Please note that we are unable to cancel registrations that have already been paid for or duplicate registrations, or to provide refunds. Additionally, please exercise care as we are also unable to process changes that would result in a change in fees that have already been paid.

About Abstract

Local Organizing Committee of ICHA20 Hiroshima

Other inquiries

JTB Business Toransformation Corp.
Chubu Mice Center
E-mail :
Business hours:Monday-Friday 10:00am-5:00pm +0900(JST)
(Closed Weekends and Holidays)