Australia's horse racing industry has been shocked by the death of a second female jockey in the space of just two days.

Key points: Ms Tyndall was dislodged from her horse during a race in Darwin on Saturday

Ms Tyndall was dislodged from her horse during a race in Darwin on Saturday She was taken to Royal Darwin Hospital but died a short time afterwards

She was taken to Royal Darwin Hospital but died a short time afterwards Her death follows an apprentice jockey's fatal fall at a Melbourne racecourse on Friday

Thirty-two-year-old Melanie Tyndall, who was also a police officer, died after falling from her horse, Restless, at a Darwin racetrack on Saturday.

Ms Tyndall's death came just a day after apprentice jockey Mikaela Claridge died from injuries suffered in a trackwork accident in Victoria.

In a statement, Darwin Turf Club said Ms Tyndall's fall happened during the third race of the day at Fannie Bay, Darwin.

"Melanie's mount Restless appeared to clip the heels of another runner, she became unbalanced and was dislodged near the 300-metre mark," the statement read.

She was taken to Royal Darwin Hospital but died a short time afterwards.

Mikaela Claridge died from her injuries after falling from her horse during trackwork in Victoria on Friday. ( Twitter: Racing Victoria )

Australian Jockeys Association chairman Des O'Keeffe said it was shattering to learn of the death of the Northern Territory jockey.

"Mel was a much-loved and highly-respected and successful jockey who had achieved great things in her professional career and outside the world of horse racing," he said.

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"The thoughts of all Australian riders are with her family and her Northern Territory colleagues at this time."

Trainer Michael Hickmott took to Twitter to pay respect to a "remarkable human being".

"If people only knew the hurdles you conquered in your life to make what you did of yourself," he tweeted.

"We were all so proud of what you achieved. You defied the odds."

South Australian jockey Eran Boyd tweeted she felt numb.

"It's so hard to comprehend losing another friend and fellow rider. These past two days have absolutely shook our industry. Heaven has gained another angel."

Libby Hopwood, who retired after suffering brain injuries in a fall in which a rider was killed, tweeted: "Simply lost for words. Sometimes the price of this industry seems too high."

In 2013, jockey Simone Montgomerie died on Darwin Cup day after falling from a horse.

Thoroughbred Racing NT and the Darwin Turf Club will hold a media conference on Sunday afternoon.

ABC/AAP