Creatures that are often catadromous, meaning they live in fresh water and breed in salt water Crossword Clue

 The answer to the crossword clue "Creatures that are often catadromous, meaning they live in fresh water and breed in salt water" is EELS.

Eels are fish that are known for their ability to migrate long distances between fresh and saltwater. They are born in saltwater, but they migrate to freshwater rivers and lakes to grow and mature. Once they are sexually mature, they migrate back to saltwater to breed.

Eels are found all over the world, but they are most common in temperate and subtropical regions. Some of the most common species of eels include the European eel, the American eel, and the Japanese eel.

Eels are an important part of the ecosystem, and they are also a popular food source in many cultures. However, some species of eels are threatened due to overfishing and habitat loss.

Here is an example of how to use the word "eels" in a sentence:

Eels are one of the most fascinating creatures in the ocean.