Fish has coached the Heat for three seasons, winning the past two national titles and finishing runner-up in his first season.

However, the Heat front office has remained steadfast in its belief of turning over the coaching staff every few years to prevent things from becoming stale.

A former minor leaguer for the Los Angeles Angels, Fish will adjust his focus to a high performance role for Baseball WA.

Fish had worked in both positions for the past three years, but due to concerns over time constraints of both jobs, Fairfax Media understands hasn't been offered a new contract for the Heat.

The decision comes a week after Perth appointed former halcyon days slugger Tony Adamson as its new CEO.

But the decision on Fish's future was made before Adamson's tenure began.

Australian baseball Hall of Famer Adamson said there remained some chance Fish could return to his position.

"Right now we are in the market looking at our options from our manager's point of view," he said.

"Steve's got a very important role with the high-performance division of Baseball WA and he probably needs to put some focus into that.

"He'll still be involved with our Heat program because that is a high-performance program, but we are looking at all our options.

"He has a high performance role with Baseball WA, which is ever-growing. We just need to make sure he has enough time to do that role justice."

The Heat is believed to be looking overseas with a number of minor league coaches in its sights for the upcoming season.

With the Australian Baseball League season running November through to early February a minor league manager could come across in the American off-season.

It has been the long-held view of Major League Baseball that the ABL would become a development league for players, managers and administrators. 

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