Not an easy question to answer, since a kayak is essentially a solo boat, which doesn’t lend itself easily to tandem applications –
In principle, it’s possible, since many kayaks are big enough to take two passengers on board. But practically, having two anglers fishing out of a small vessel such as a kayak is problematic with regards to several aspects that command serious consideration:
The first problem is Safety – two passengers moving about in the cockpit or on the deck of a fishing kayak in an uncoordinated manner can easily destabilize it, with the result being one of them overreacting, and causing the kayak to capsize. Obviously, having fishing rods, lures and fish flying around in all direction in such a limited space isn’t the best a recipe for safety.
The second problem is Convenience – Every angler wants and needs to have an unlimited range of motion, in order to perform basic things such as casting, reeling, landing the fish, unhooking, etc. Angler also need to have a comfortable workspace for attaching lures and bait, and doing other technical work involving the manipulation of fishing gear, including sharp objects such as fishing hooks and knives.
The last thing you want when you’re fishing in tandem is to get your fishing lines entangled with those of your partner, or get poked in the eye by a misguided fishing hook, etc.. -The possibilities for a disaster are so numerous that it’s practically impossible to list them all in this article, but we assume the reader gets the point…
Unlike paddling a kayak in tandem, kayak fishing in tandem is more complicated, and more difficult, and as a rule of thumb we don’t recommend it, unless the crew is composed of one experienced adult kayak angler and one junior kayak angler, such as a child, who needs guidance and often even technical help with handling their fishing gear. In such case the obvious choice for a kayak is the W500 that features a 6 ft long cockpit, and a longitudinal seat that makes it possible for the two anglers to sit separated by a long span, but also to approach each other effortlessly and safely when they need to do something together, such as in case the experienced angler has to instruct the novice, or help them hands-on perform a fishing related task.
As far as standing up while kayak fishing in tandem, this is even more problematic, and should be practiced only after both anglers have practiced tandem kayak fishing before, as well as stand up kayak fishing. Needless to say that the kayak used for this type of fishing should be fit such such activities to begin with, and vendors’ claims about their kayaks’ stability should be taken with a good dose of caution, common sense, and sufficient skepticism. It’s good to remember that it’s you and fishing buddy that are going to be out there in the real world, and not some guys who get paid to demonstrate fishing kayaks in front of a camera…
Kayak fishing offshore in tandem is even more difficult, and hazardous, and we do not recommend it, unless both anglers are lightweight and very experienced fishing together out of small boats, such as dinghies and canoes. Fishing in tandem out of a kayak equipped with a powerful motor, such as an outboard gas engine adds yet another level of risk, and in such cases you may consider outfitting your kayak with a pair of large size outriggers, such as this South Korean couple is using on an offshore fishing trip: