Help choosing a nice knife

[brother]

Hello,

My brother is a keen fisherman - both sea and fly - and it is his birthday soon. I was thinking of getting him a good fishing knife as he hasn't got one.

Does anyone have any recommendations? As it is his birthday I'd like to get something that looks nice as well as hold a good sharp edge and won't corrode with sea water.

He does equal amounts of sea and fly fishing so a knife suitable for both is the ideal.

Cheers!