Transgender athletes have been banned by British Rowing from competing in women’s races.
Only those “assigned female at birth” will be eligible to enter its female category and represent Great Britain or England in international events, the sports body has said.
All athletes will be eligible to compete in an “open” category, while a “mixed” category can be offered by organisers if 50% of crew are eligible from the women’s category.
The rule change is due to come into effect on 11 September.
Transgender rights have become a major source of debate as sports seek to balance inclusivity while ensuring there is no unfair advantage.
LGBT campaigners believe excluding trans athletes amounts to discrimination.
But critics of transgender inclusion in women’s sport argue going through male puberty gives competitors a huge advantage that transition does not mitigate.
Announcing the revamp of the competition rowing rules, the governing body said: “British Rowing is committed to promoting an environment in which rowing is accessible and inclusive and to ensuring that we provide opportunities and enjoyment for everyone.
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“In order to achieve this in a fair manner, we need to establish conditions for competition that guarantee fair and meaningful competition by placing necessary and proportionate restrictions on eligibility.”
It added: “British Rowing is committed to the annual review of this policy and its procedures within 12 months of its most recent update to ensure that our approach is consistent with latest guidance, science, information, and studies.
“This will include, where possible, further dedicated rowing specific research into this area.”
The group went on: “All rowers are fully welcome in our sport, and we will not tolerate any form of discrimination so we urge the community to come forward should they experience any issues.”
World Rowing, however, allows transgender athletes to compete in the female category if they reduce their testosterone levels to below a certain level.
International governing bodies covering a range of sports including athletics, swimming and cycling have tightened their participation rules in recent years.
