Helmet Crabs: Any special requirements?

[LuSnow]

Hello there

Situation:
I need helmet crabs. I have already unlocked them while fishing at Brewer Beacon for Navigator's Dagers, but they're rare. The recommended location for higher spawning rate is at the Slat Strand in Lower la Noscea.

Problem:
No matter where I stand at the Slat Strand, when I cast, I get the notification "you can sense something swimming below, but your are unable to locate where...".

My question:
Why? What do I miss (fisher level 19)?

[Darkstride]

That message means you are a lower level than the fishing hole. You need to level up.

[Mireille_Bouquet]

Just to add, level 20 is the required minimum level for Slat Strand.

[LuSnow]

Thanks guys! I did the next two fisher quests, it brought me to 22 and it then worked