Just like fellowship said . . . Those stringers are tabbed to the hull . . . they are pre formed outside the hull and then glued (tabbed) in place with fiberglass tape (18oz roving and 1/2oz cloth). Those bonds should never come apart . . they didn't do the prep work (i.e. sand clean with acetone). This is why tracker gets a bad reputation.
Anyhoo . . to fix: Get a cutting wheel or a thin disc for a 4inch grinder and run it along the base of the cracked tabbing on the stringers. Remove the old tabbing. Dry out the stringer (maybe some 2 inch holes evenly spaced). When the area is dry prep the hull and the bottom 4 inches of the stringer . . . clean the area with acetone. Buy 25yards of 6" wide 1708 or 1808 fiberglass tape and a gallon of epoxy.
www.uscomposites.com
Tab the stringers back in place ( if 6" isn't wide enough you can "widen repair) by overlapping of the layers . . . make sure that the overlap covers the seem i.e. where the stringer and hull meet).
3 or 4 layers of 1808 should be enough.