You will need a licence to do that, I believe you get all kind of fish, perch, bream, pike, carp, roach, eel, rudd, mullet, Zander from the canals and also the rivers like the amstel and IJ in Amsterdam.
Be good mate! where are you staying? in Amsterdam again? could ask @SirBalon to indulge in the fun but as soon as you hit de Pijp area of Amsterdam he will be hanging about with the trendy hipsters
Utrecht is a great place to visit if you do not want the tourists like Amsterdam but I think Amsterdam has a more cosy feeling to it, Amsterdam people are very friendly but you need to understand their sense of humour with the way they come across, but of course if you meet the city workers they are rude and cold who only have 1 thing in mind that is to get from A to B. Rotterdam is actually a great city and is becoming one of the up and coming areas in Europe, really great modern things there but its a shame it did lose a lot of its real character thanks to the Luftwaffe
Ajax 3 - 0 Feyenoord, the game had a few strange moments, A yellow got changed to red with VAR and also a goal was given via the technology even though Dolberg kicked the keepers arms to force the ball over the line.