The number of complaints to Victoria's Racing Integrity Commissioner have jumped by 62 per cent.
There were 123 complaints in 2021/22, up from 76 the previous year, according to the commission's most recent annual report released on Thursday.
Tip-offs included a person fraudulently selling horses they did not own, a former worker stealing money, and concerns about animal welfare at a particular track.
Someone else revealed a participant planned to administer a prohibited substance before a major race, and a potential conflict of interest due to a romantic relationship.
About two-thirds of all complaints were about the conduct of employees, registered participants or systems related to controlling bodies.
There were 16 complaints about animal welfare, down by 36 per cent compared with the previous year.
Racing Integrity Commissioner Sean Carroll attributed the "significant upswing" in complaints to his office interacting more with the industry, including more than 150 visits to race meetings, trials, kennels and stables.
The commissioner oversees integrity matters for Racing Victoria, Harness Racing Victoria and Greyhound Racing Victoria, but cannot lay charges.
Victoria Police told the commissioner there was no evidence of widespread criminal infiltration of the industry, but that it does have vulnerabilities.
Mr Carroll said there had also been more referrals from controlling bodies.
AAP sought clarification from the commissioner over numerical discrepancies in its 2021/22 annual report.
It showed there were 83 complaints in 2020/21, but the commissioner's report that year stated there were 76 complaints.
A spokesperson said the 83 complaints included seven that were later reopened, therefore the number of new complaints still rose by 62 cent.
Racing Minister Anthony Carbines has been approached for comment.
