I just bought one of these and mounted it on my cooler. It's going to be great for keeping track of how many perch are in the cooler instead of ripping up my hands taking them out and counting them. The cost of just one perch over your limit would be at least 5X more expensive than this counter. Check it out and let me know what you think of it.

Thanks Russ

http://www.catchcounter.com/