What do you think is easier:
Breeding a fish in a controlled environment
or catching a healthy fish in the wild, with survival instincts on full, with tons of places to hide and an infinite area to swim away. Captive breeding is much easier.
1. Name a single fish that went fully extinct just because of aquarium collection
2. Captive bred fish are becoming more popular then wild caught ones, and the most popular fish like clownfish are nearly all captive bred these days and it's much easier to breed then chase a wild fish, so the 98% statistic is bogus
