Never carry a fish in the net. Always transfer to a Koi Sock or a blue bowl . Nycon nets can be equipped with extendable handles. These suck at long extension because the handle becomes so flimsy that the net lags behind the fish. You need a long, stiff handle to be able to maneuver the net under the fish.
Plastic bags are also nice to have.
Large bags can be used to wrap the fish in for injections, or other treatments. When you have large plastic bags, you can bag a fish to carry to the vet or to a show. Bag the fish under pure oxygen , which is available at a lot of pharmacies for older people with emphysema. They rent the tanks for eighteen dollars per month. A regulator may be extra.