Grimsby claimed a hard-fought 2-1 win at AFC Telford to strengthen their Blue Square Bet Premier play-off ambitions.
The visitors took the lead in the 12th minute when Nathan Pond rose highest to head home Joe Colbeck's cross.
But they were pegged back nine minutes later when Steve Jones produced a neat finish inside the area after some good work by Luke Hubbins.
And the Bucks could have been ahead just after the half-hour mark but for a good save from James McKeown to deny Steven Leslie.
However, it was the Mariners who led at the interval after Ian Miller's low drive found the bottom corner six minutes before the break.
The home side failed to fashion much of a response after the break only managing a series of wasteful efforts.
Jordan Rose and Steve Jones both tried their luck to no avail while James Spray clipped a lob over the bar in the closing minutes.