A while back, I recall a post asking if bass will eat perch and whether perch colored baits are effective. Also, bait size comes up pretty often. How big is "too big"? Since the Fall, I've been doing a lot of reading on this stuff, and it's been very, very helpful in my understanding of what I'm trying to trigger with a 4wt fly rod, an 8wt streamer rod, all the way to my jig and crankbait sticks. This picture popped up on my Facebook feed and it's a perfect example that dominant predatory fish, regardless of species, will take some big ass baits!
Here on the bass side, we know that bass will take some pretty large meals. The more I get into fly fishing, the more I dig guys like Kelly Galloup that regularly fish huge 5-10" streamers for brown trout. The more I see stuff like this, the more I believe that once a fish reaches predatory size (large enough to primarily feed on fish and not invertebrates), that their habits change dramatically, regardless of species. Now, I'm not suggesting that they won't still eat insects, nymphs, etc, but that their entire feeding habits change dramatically. It can effect where they hold, why they strike, when they hunt, and as they become larger, more dominant predators, their willingness to forego eating tons of small meals in exchange for larger, less frequent "feasts". Granted, local forage will always be the primary indicator of a predator's diet, but this idea leads me to believe that larger fish will, most likely, even forego standards like crayfish if given the opportunity to feed on baitfish that are easier to digest. (Totally just a theory, but not without evidence)
One of the reasons I dig the big streamer fly anglers is because most of them have been heavily influenced by watching B.A.S.S, FLW, pike, and musky anglers. Most of the flies these guys are throwing are more like 7" jerkbaits, swim jigs, and crankbaits and 12"+ jointed swimbaits than anything you'll see in A River Runs Through It. Look up Double Deceiver of Game changer patterns, if you aren't familiar. It's pretty eye opening and amazing how much they've changed the fly game by following bass anglers. It's literally changed their sport.
I also think that there's a TON that bass guys can learn from the big streamer fly anglers. For example, they tend to care a lot more about how baits present in currents than 95% of bass anglers I've ever been around. One of the big takeaways has to do with how most predators take fish. While a pike might T-bone prey, bass and trout lack the kind of teeth necessary for that to work. So, generally they position to take bait head first (other fish) and tail first if possible (crayfish). Spiny pectoral and dorsal fins can kill a fish if they go the wrong way, especially with madtoms, sculpins, sunfish, and perch. Similarly, learning how to present "drag free drifts" with high vis braid has changed the way I approach virtually all finesse fishing, and it's paid off tremendously.
Anyhow, here's Ike with a solid bass choking on what looks like close to 10" of perch... Head first.