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I think the line about the reason for the limit being advancements in technology is just a way for them to get support and justification for the limit. I also think the limit is in place more for softwater than hard water. My dad and grandfather never used a flasher thru the ice and they caught as many or more fish than we do today. Softwater is a different story because of side imaging you can cover so much water quickly and locate structure and fish it makes a huge difference in efficiency. No Vex, Marcum, Hummingbird or any other brand will make you catch more fish if aren't around them. If you are not able to read a map to narrow your search for the fish, the flasher will not help much. Before flashers I was taught to start jigging the bottom and work your way up 6 inches at a time until you got a bite or got to the bottom of the ice. If fish were around they would let you know what depth they were running at. We did not give a hole more than 3-5 jigging passes before moving on, until we found fish. It was amazing to watch how many guys back then just kept their jig within 1 ft of the bottom. You could be tearing them up 5 ft off the bottom and they would not get a bite. A vex just makes it easier to see where they are running without having to experiment with depths. I think flashers have made us lazier too. If we see fish we will often sit and retie 20 times to get them to bite because we know they are down there. In the past with no flasher we would move to find more aggressive fish, because without a bite we didn't know they were down there. I would also argue GPS is as big of an advancement as ice flashers due to the ability to mark areas in a boat and return to them on the ice. That was not easy with triangulation especially if the spot was fairly small.
I don't see the increase in fisherman in Indiana at all. Just the opposite actually. Licenses across the board are down substantially. From 2003 to last year 2013 when I checked license sales were down over 60k. Now I don't know in the tune to how many are hunting and how many are fishing but I can vouch that on the lakes I fish it's not nearly as crowded as it used to be but with that said places to park have decreased too. North Snow Bay, Blue Lake, Docksiders just to name a few so people in those areas are forced to goto lakes where the public access puts them close to walking distance of the fish. I think what most of you are seeing is the fisherman that still ice fish are fishing these areas. It's not that the numbers have increased its the places to park are decreasing at a fast pace due to development and lost places like Docksiders to trash.
Interesting stuff. Did anybody happen to catch the Wall Street Journal artical on $50,000 plus ice shacks in the upper parts of the country (think it was in January). Also, if you wanted a 10 person clam hub last year in Indiana, there was a waiting list... (So I'm leaning towards more people being on the ice, just not as hard core about the catching). I can admit, by the end of last season, cookouts and beer drinking on ice was as fun as a limit of crappie, and it reminded me of the old days of being dailed in to the conversation and not the vex.