What does a marsh kill fish eat?

"Marsh kill" isn't a recognized term in biology or ecology. It's possible you're referring to a specific local term or a misspelling.

To help you, could you clarify what you mean by "marsh kill"? Maybe you're asking about:

* A specific type of animal that lives in marshes and eats fish? Some examples could be:

* Alligators and Crocodiles: These apex predators are common in some marshes and prey on fish.

* Herons and Egrets: These wading birds use their long legs and beaks to catch fish in shallow water.

* Snakes: Some snakes, like water snakes, are skilled swimmers and hunt fish in marshes.

* A specific phenomenon that causes fish to die in marshes? This could be related to:

* Pollution: Chemical runoff from farms or industries can poison fish.

* Algal blooms: Large blooms of algae can deplete oxygen levels, causing fish to suffocate.

* Low dissolved oxygen: Natural events like droughts or excessive rainfall can lead to low oxygen levels in marshes, harming fish.

Please provide more information so I can accurately answer your question!