Thankfully, all you need to get the Scurvy Rod in Fisch is 50,000 cash. Head to Forsaken Shores, head right from the Merchant and climb three different ladders. Now, talk to the NPC Jack Marrow and ...

Only if you fish with the Sunken Rod should you use the second method to get Magic Thread in Fisch. Scurvy Rod is a decent option for the mid-game in Fisch as it has no serious downsides.