A quick Google search found this article. It's about gut-hooked Musky, but I'd assume bass would probably show similar results:
In 1998, a radio telemetry study was done on the Chippewa Flowage, whereby 47 muskies were caught, tagged with externally mounted radio transmitters, and then released. Among other goals of the study, I saw this as an excellent opportunity to finally get a definitive answer to the single hook sucker mortality question. Out of 9 muskies which were gut hooked in this study group, we were able to confirm that at least half of the fish had died; but because the batteries on the transmitters ran out by spring, the degree of delayed mortality couldn't be fully explored on those fish.
After this study ended, the urgency to more deeply explore this issue was realized and funding was secured from Muskies, Inc (the Hayward Lakes and South of the Border Chapters) to do a gut hooked musky study on the Chippewa Flowage.... solely to find out what percentage of fish were dying from single hook sucker rigs. After all, a substantial contingent of musky men were still using this method throughout the musky range and it was high time we found out just how bad single hooks really were.
Between October 20th and November 21st of 1999, 14 muskies ranging between 33" and 47 1/2" in length were caught on these "swallow rigs" and "transmitted" so that they could be tracked the following spring. Shockingly, we didn't even have to wait very long to begin seeing the the death toll mount. Two muskies had died of hook injury to the throat during the tagging process and two others were later discovered dead.... washed up on shore.
Once tracking began in the spring 2000, it wasn't long before all the remaining muskies were located using a radio receiver and their exact location pin pointed. At that point it was simply a matter of repeatedly going back to each musky's locations pin pointed location to check if they had either swum off...or were lying dead on the lake bottom. We soon discovered that most of the study muskies had died - two of which were actually spotted with an underwater video "fishfinder" Two of the study muskies were actually swimming around through July though. How great it would be to actually see these fish - just to be able to examine them. Ironically, it turned out that both of these muskies were caught on hook and line, photographed, and then released by anglers. In talking with them and studying the photos of these fish, it is clear to see that these muskies were not healthy. In fact, they were both dying a slow death. These fish were both much thinner then normal and - sure enough - it wasn't long before delayed mortality ended up killing them.... bringing the total death count to 100% of the 14 study muskies which had been gut hooked the fall before.
http://www.chippewaflowage.com/sucker_study.html
:-?