Players non-tendered immediately become free agents. The tender means the players will be under contract, but their specific salaries have yet to be determined.
Even though the Marlins extended the tenders, any of the six still could be traded.
With tenders extended, the Marlins now will negotiate with each player about a specific salary for 2015. If no agreement is reached by the date to exchange figures, per club policy, the salary will be set by an arbitration panel.
Miami entered the offseason with another arbitration-eligible candidate. But the team put to rest any doubt about Giancarlo Stanton's future when they signed the two-time All-Star to a 13-year, $325 million contract.
Of their remaining arbitration players, McGehee is entering his final season going through the process. The 32-year-old third baseman will be a free agent next year, unless the team is open to signing him for at least two years, which is a possibility.
McGehee, who made $1.1 million in 2014, was the National League Comeback Player of the Year, batting .287 with four home runs and 76 RBIs. He established himself as one of the club leaders and he played solid defense at the hot corner.
McGehee's salary projects to jump to about $3.5 million.
Cishek and Dunn are arbitration-eligible for the second time.
Cishek, 28, collected 39 saves and threw 65 1/3 innings. But his cost is starting to rise after he made $3.8 million in 2014. He could be making just under $7 million next year, and it is unclear if the Marlins are willing to discuss a multiyear contract with their closer.
There has been some speculation that Cishek could be a trade piece, but Miami appears to be leaning toward retaining him.
Dunn, 29, is a lefty who made $1.4 million last season, and could see his salary jump into the $2.4 million range. He's been dependable since being acquired from the Braves as part of the Dan Uggla trade in November 2010. Dunn appeared in 75 games in each of the last two years.
The Marlins don't have much left-handed relief depth, which may impact whether Dunn stays or goes. If he is dealt, Dan Jennings would be the closest the organization has to taking over the late-inning lefty role.
Two big pieces of the rotation are reaching arbitration for the first time.
Alvarez, an All-Star in 2014, assumed the role of ace after Jose Fernandez underwent Tommy John surgery.
The right-hander was a bargain at $525,400, posting a 12-7 record with a 2.65 ERA. His three shutouts were tied with Adam Wainwright of the Cardinals for most in the NL.
Alvarez, who no-hit the Tigers in the final game of the 2013 season, is headed for a salary bump, perhaps as much as $4.5 million. He is a player the Marlins are open to offering a multiyear deal.
Eovaldi's status is up in the air. The hard-throwing right-hander, who paced the team with 199 2/3 innings pitched, could be a trade candidate.
The 24-year-old has tremendous upside, but he struggled with a 6-14 record and a 4.37 ERA. He also gave up an NL-leading 223 hits. After making $517,000 in 2014, Eovaldi's salary could top $3 million.
Crow, acquired from the Royals on Friday, enters his second season of arbitration. The right-hander will get a raise from the $1.475 million he made in '14.
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro. This story was not subject to the approval of Major League Baseball or its clubs.