Sand Weakfish
Sand Weakfish (Cynoscion arenarius) is a saltwater species. The first thing to check: plain silvery-yellow flanks with no spots and no wavy back markings of any kind. The look-alike to rule out is Spotted Sea Trout: seatrout carry distinct round black spots on the back that run onto the second dorsal and across the tail; a sand seatrout has none at all.
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| Scientific name | Cynoscion arenarius |
|---|---|
| Also called | sand seatrout, white trout, sand trout |
| Water | Saltwater |
| Group | Drum |
| Temperature | Common between 65 and 82 °F. |
How to identify a Sand Weakfish
- Plain silvery-yellow flanks with no spots and no wavy back markings of any kind.
- A pale yellow wash on the fins, especially the tail and anal fin.
- Two canine teeth in the upper jaw on a slim body, but a smaller mouth and smaller fish overall than its relatives.
If you would rather not work through a key on a wet deck, photograph the fish and let the app name it — you get the common and the scientific name back, and the record is filed before you release.
Fish it is mistaken for
| Species | How to tell them apart |
|---|---|
| Spotted Sea Trout | Seatrout carry distinct round black spots on the back that run onto the second dorsal and across the tail; a sand seatrout has none at all. |
| Weakfish | Weakfish carry dark wavy diagonal lines on the upper back; a sand seatrout's back is plain. |
Side-by-side comparisons
Read the full entry for Spotted Sea Trout and Weakfish.
Where it lives
The Gulf of Mexico from Florida to Texas, in bays, passes, beachfronts and over sand and mud bottom. Shallower and more estuarine than either relative.
Temperature
Common between 65 and 82 °F.
The conditions that matter
Sand seatrout school over open sand and mud rather than holding to grass or structure, and feed hard on a moving tide in passes and channels. They are frequently the fish filling a cooler that people believe is full of spotted seatrout — which matters, because the two carry different limits in most Gulf states.
Global Fishing League records 18 weather and water readings against every catch automatically — tide stage, barometric pressure, water temperature, salinity, dissolved oxygen, chlorophyll, swell, current, moon phase and more, taken at your GPS position at the moment you log the fish. Over a season that turns a hunch about sand weakfish into a pattern you can read.
See every reading recorded with a catch, or the guides to what each reading means.
Size limits, bag limits and seasons
Size limits, bag limits, slot limits and seasons are set by your state wildlife agency — and for many offshore and migratory species by federal regulators — and on many waters they differ from the statewide rule. They also change between seasons. Check the current regulations for the exact water you are fishing before you keep a fish — we do not republish limits here, because a number that is a season out of date is worse than no number.
What the app does do is make your side of it accurate: every catch carries a length measured from the photograph, a GPS position and a timestamp, exportable if you ever need to show your work for a tournament or a record claim. It is also what a Global Fishing League entry is built from — a record that verifies itself, without publishing where you caught the fish.