The review into the April Vancouver oil spill that spread from English Bay finds the grain ship's owners slowed the reaction time to the emergency because they refused to admit the vessel was the source of the fuel spill.

The report was commissioned by the Canadian Coast Guard after a malfunction on the grain carrier MV Marathassa caused about 2,700 litres of bunker fuel to spill into the bay on April 8.

The report released Friday also found uncertainty of roles and responsibilities, miscommunications and technical difficulties resulted in an almost two-hour delay in response after the slick's discovery.

Very high consequences

Former assistant Coast Guard commissioner John Butler conducted the review and has made 25 recommendations on how future marine spills could be handled differently.

"This was an operational discharge of persistent fuel oil with very high consequences," Butler said in his report.

The spill soiled beaches around Vancouver, including along Stanley Park — the city's jewel — and across the Burrard Inlet in West Vancouver. The response and recovery operation took 16 days.

Butler recommended the coast guard have adequate staff to respond to a major marine-pollution incident, conduct exercises with First Nations and release accurate information as quickly as possible.

His report also said the absence of officials from Environment Canada impacted the response's effectiveness.

"Environment Canada's on-site leadership in providing sound, independent scientific and environmental advice would have been greatly beneficial to this incident," the report stated.

Premier Christy Clark and Vancouver Mayor Gregor Robertson criticized the coast guard's response at the time, with Robertson questioning why the city was not alerted until 13 hours after the spill was discovered.

Fisheries Minister Gail Shea said she has directed the coast guard and other federal partners to act swiftly on all the recommendations and some are already being implemented.

Polluter pays

Shea said she wants to reassure B.C. residents the federal government is committed to protecting Canada's marine environments.

"The polluter-pay principle means that the polluting vessel is responsible for the costs of cleaning up the mess they left in English Bay," Shea said in a news release. "Our government will aggressively pursue compensation."

The Marathassa is registered in Cyprus.

B.C. Environment Minister Mary Polak said in a release that the review of the spill is a very good first step towards ensuring the coast is better protected.

While Polak says they're encouraged by measures taken by the federal government over tanker safety and marine-spill preparedness, her government remains focused on a world-class standard.

"We are on the right path, but we also recognize there is still much more work to do towards achieving the sort of marine spill response capabilities we can be truly proud of," she said.