aye foragers set is expensive, but seems u not need it to catch the 106 fish needed for iron rod, but will need supra rod, max melds and FC buff, though only 2 fish u really need 393 gath, u will need the forager set to can hunt the 6 legendary fish.

Also overmelding fisher set not really a trouble if u can make ur own materias having at least 1star crafter for leather and weaver.