The Feridians, marine fauna, kings of the ocean and for centuries unmatched with no predators and capable of eating and surviving on any source of food, even plankton.

This thing evolved perfectly to eat and not get eaten.

Thus the only remaining pressure for evolution was sexual selection.

Eventually Feridians with better and better courting skills produced more offsprings.

Feridians evolved language and society not to survive the harash environments but to have more sex. They are not really inventive when it comes to building stuff, but they are genius pick up artists and incredibly proficient at flirting and with an unmatched array of seduction methods.

Humans males who can be identified as "the average guy" have 4 to 6 different sexual partners in their entire lifetime, and sometimes those partners are females!

In contrast with the average everyday mediocre male feridian which has 4 to 6 sexual partners per day, of which most of them are actually female partners!

One could say Humans have high general intelligence but low social intelligence, they have more wars than sex..probably they are so violent cause they are frustrated sexually...poor naked apes.

Feridians are real alpha chads, they solve every conflict with their genitals. (Yes every war can be solved with sex, you just need the right methods and right amount of immagination)

Feridians do not have hands,and look like really big and colourfull fish, about the size of a hippo. They have social structures, verbal language, sign language and written language using peddles arranged in the sand.

Feridians are not keen on having sex with humans, that's kinda gross and also taboo, even if flirting and screwing is their best skill. So what other services may the feridians sell to humans in exchange for various favours and items?