Black wiskerfish? Interesting! That sounds new for Myrland.
For sand ray, it’sprobably best with strong line and size 10 below 2000. I have not been able to test this fully yet but in Starvault’s racist hate against the peoples of westcoast of Myrland, I think they gutted the rate of sand ray. You can catch them in great quantities in the southern seas I can confirm.
If you want to make money with fishing you have to resign yourself to:
1. Selling alchemists Calxfish,
2. Owning the MK bottleneck, the local keeps, the rare ores to the north, the Blackwood and more, then you also get to fish for venom cup and silk ray which will make you real money, because as Starvault reinforces a ‘winner take ALL’ philosophy for its games
3. Fish far to the south in extreme isolation for sand ray and blood kua, while you dodge the twitchy gankers of jungle camp. Good luck!