Dr Visser claimed the park was anxious to keep the orca because of inbreeding among the small pool of captive orca worldwide.
Morgan was held in a tank with a mature male, which had been observed chasing and body-slamming the young female, subjecting it to "intense sexual pressure".
"It is clear that Morgan must be immediately removed from this dysfunctional group of orca at Loro Parque, before she is injured any further or succumbs to direct or indirect effects of the injuries and stress," Dr Visser said in a report prepared for the court.
The park had since erected a gate and barred access to an underwater viewing window so Morgan could not be observed outside show times.
Dr Visser said using Morgan for entertainment and breeding was a violation of the export permit.
Three judges in the Amsterdam District Court will revisit last year's decision to allow Morgan's transfer to Loro Parque in a "merit procedure". If they find any errors were made they can send the case back to the Dutch Ministry of Economic Affairs and Agriculture.