We call them paddle fish here in Montana.

I go after them every spring when the waters high,it is a blast.

I don't know what your water is like over there,ours is fast.I use a 14 FT surf rod made by Pinicale,I paid like 25 bucks for it,I use a over size reel made by Browning,holds about 200 yds of 40 lb test.We use 10/0 and 8/0 trebble hooks and 5-6 oz bank sinkers.

There are several Rod/reel combo's out there for like 50 bucks.They say to use a rod 10 ft or taller and needs to be fairly stout,any rod/reel used to cath big cats will work.
The line I use is 50 ld Big Cat made by Triliene,others use braids,super mono,mono or fushion.All it realy needs to be is stout enough,40 lb or bigger.The bigger the line the shorter your casts,so I try to stay with 40-50 lb.
Pepole in our group have caught them up to 80 lbs and this rig has held up,they can peel alot of line when you hook them.

I usaly cast up-stream at a angle,above a deep hole and snag across it,wait for you hooks to get to the bottom,think of it as a clock.With your rod tip at 4 jerk the tip up to 12 counter clock wise,in a sweeping moition.Reel the slack up and doit again,lots of work but it's fun,and you can get alot of beer drank.

Hope this helps
BBJ