Hiya,
Noah was at least 500 years old before God spoke to him of the flood. (Gen 5 vs 32)
He was 600 when the flood began (Chap 7 vs 11)
This gave him a maximum of 100 years to prepare.
Second on his list, (after building his ark).... round up the animals..., fowl, cattle, creeping things ( insects? anyone know the translation?), every living thing. (chp 6 vs 19).
Today, there are thought to be at least 4 million groups of insects, and the estimated number has been severely reduced lately, see: http://news.bbc.co.uk/1/low/sci/tech/1949109.stm
Assume Noah got all of these on his ark.
He had maximum 100*365*24 = 876000 hrs to find and catch them all.
That's 876000/4000000 = 0.219hrs = circa 13 minutes an insect. Non stop, for 100 years, without sleep, building ark time or stopping for coffee. And without those he'd already caught dying before the flood began.
Is this actually feasible???