Here are the qualifications for a MO record fish:
1. To qualify, the applicant’s fish must:
a.be captured by legal methods from Missouri waters,
b.be a species included on the Missouri State Record Fish list on the reverse side of this form and
c.meet or exceed the current record.
2. New records must meet or exceed the Master Angler minimum weight for that species to be considered.
3. Anglers may be recognized in two different categories: “pole and line” or “alternative methods” (this includes trotlines, throwlines,
limblines, banklines, jug lines, spearfishing, snagging, snaring, gigging, grabbing, archery or atlatl).
4. Fish must be weighed on a certified scale in the presence of an employee of the Missouri Department of Conservation.
5. The entry must be examined and identified by a Department of Conservation Fisheries Biologist or Conservation
Agent familiar with the genus. If these persons cannot identify the species with certainty, they must seek the assistance of a designated fish identification expert. Call (573)522-4115 x3501 for assistance in finding and contacting the nearest identification expert. The Department reserves the right to involve additional biologists to confirm the identity of the species.
6. Genetic testing will be performed by the Missouri Department of Conservation when necessary for positive identification at no cost to
the applicant. Potential record fish may be frozen, but should not be mounted or consumed prior to receipt of a letter confirming the
record.
7. A color photo of the fish is required.
Sounds like your next step will be to throw that sucker in the freezer and call a biologist. Congrats on the catch!
Here's the entry form: http://mdc.mo.gov/sites/default/files/resources/2010/05/staterecordfishentryform_fill2.pdf