Definition of hatch:
Referring to the time when insects land on or emerge from the water in significant numbers.
Hatch is mostly a fly fishing term referencing the period of time when larva transitions to insects or when insects lay eggs on the water. This is an ideal time for fly fishing, since fish try to catch the insects near the water’s surface.
Anglers will try to “match the hatch,” meaning they will use flies similar in style to the insects found on the water, hoping to attract a fish to their artificial fly.
How to use hatch in a sentence:
There was a mayfly hatch last night, which made today a great day for dry fly fishing.