Three specifications decide a fishing kayak and only one of them is on the front of the listing.
Length determines tracking — how well the boat holds a straight line. Under ten feet, a kayak weathercocks in wind and gets pushed around by current, and you spend the day correcting instead of fishing. Ten to twelve feet is the practical sweet spot for fishing water.
Width determines stability. Thirty inches and up is stable enough that most people can stand and cast; narrower is faster and tippier. For fishing, stability wins, because the boat is a platform first and a vehicle second.
The seat determines whether you are still out there at hour four, and it is the specification that separates a fishing kayak from a recreational kayak with rod holders drilled into it. An elevated frame seat that lifts you above the deck is a genuinely different experience from a molded foam pad.
Choosing and living with a fishing kayak
Sit-on-top, essentially always
Sit-on-top hulls are self-bailing, easy to re-enter from the water and give you room to move and stand. Sit-inside kayaks are warmer and drier and much harder to get back into if you go over. For fishing, sit-on-top is the answer in nearly every case.
Weight is the specification that decides use
A kayak you cannot load alone is a kayak that gets used when someone else is free. Under 60 pounds is manageable solo for most people; over 80 is a two-person job or a trailer. This matters more than almost any on-water characteristic, because it governs how often the boat gets wet at all.
Check the capacity honestly
Rated capacity includes you, your gear, your cooler and your water. Loading a kayak past about 70 percent of its rating makes it sit low, handle badly and take water over the scuppers. Add up what you actually bring.
Scupper plugs
Sit-on-tops have drain holes through the hull. Plugged, you stay drier in calm water. Unplugged, the boat self-bails in chop. Carry the plugs and decide per trip rather than leaving them in permanently.
Buy safety gear at the same time
A PFD you will actually wear, a whistle, a leash for the paddle and a leash for the rod. Rod leashes in particular are the difference between dropping a rod and losing one, and they cost a few dollars.
How these were picked
I haven't handled these. Here's what I did instead.
Everyone in this category says they tested twenty of these. I haven't tested any, and I say so. What I do instead: read the manufacturer's manual and published specification, compile the numbers that decide the purchase, do the arithmetic in the open, check the live price, and name one product to skip. The scores above are judgments from that research against a published rubric — they are not measurements I took, because I do not have a lab and I am not going to pretend otherwise.