Sargasso Sea spawners Crossword Clue

 The answer to the crossword clue "Sargasso Sea spawners" is EELS.

Eels are the only fish that spawn in the Sargasso Sea. They travel thousands of miles from their freshwater homes to the Sargasso Sea to lay their eggs. The eggs hatch into larvae that drift with the currents until they are old enough to swim to their freshwater homes.

The other possible answers for the crossword clue "Sargasso Sea spawners" are:

Fish

Sharks

Turtles

Whales

Dolphins

However, the most likely answer is EELS, based on the fact that they are the only fish that are known to spawn in the Sargasso Sea.

I hope this helps!