No problem. If the guide is accurate the wife and have to get 7 fish types and 6 bug types for the current available species.
Fish we're missing: Stringfish, Ranchu Goldfish, Golden Trout, Coelacanth, Cherry Salmon, Char, Blue Marlin
Bugs missing: Ant, Fly, Migratory locust, Mole Cricket, Peacock Butterfly, Snail
One video I watched said the spam the fish bait in the proper conditions until you get your fish. I am going to put this to the test on the fish that go away at the end of the month.
It's emperor butterfly time. They go for $4k each. If you find an island that spawns them routinely, make sure you fill up your inventory.