noun
round haul net; purse seine
A fishing net that encircles a school of fish; used in commercial purse seining.
巻き網漁では、魚群を網で囲い込む。
In round haul net fishing, a school of fish is encircled with a net.
Compound of 巻き (maki, 'winding' or 'rolling') + 網 (ami, 'net'). The spelling 旋網 uses 旋 ('revolve') to convey the encircling motion.