I believe that "1 (7%)" means that you have caught one fish in Crystal Lake sub-zone, which is 7% of your total catches in Elwynn Forest.
"(0/~1)" shows how many catches (approximately) left until skill up. It doesn't make much sense while every item/fish caught gives a skill point, but when you're at say 250+ skill and need to catch several fishes to skill up, having that counter helps.
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