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Apparently the introduction of the round goby invasive species had a radical effect on Lake Erie in particular. They're a small but aggressive fish that competes with the young of all species including the bigger game fish and forces them out of protected areas into places theyre more likely to get eaten. So smaller numbers of fish are making it to like 6" long, but as soon as they make that size the goby's become easy prey and everything supersizes...so less fish but dramatically more trophy size fish
These are unfortunately really common as well in the Detroit River. Especially if using worms. For a tiny creature they can put up a surprising fight, then you pull it in and disappointment ensues. As most people should know, if you do catch these DO NOT thrown them back. Kill them. Ring Billed gulls like them!
The goby among others (zebra mussels esp) are a consequence of international trade I guess, but regulations put in place in the 80's I believe should help prevent bringing more.