* Specific fish species: Some fish are commonly called "blue" due to their color, like bluefish (Pomatomus saltatrix), blue marlin (Makaira nigricans), and bluefin tuna (Thunnus thynnus).
* Fish with blue scales: Many fish species have blue scales or coloration, and this is a broad category that could include a wide range of species.
Therefore, to answer what "blue fish" eat, we need to be more specific. Here are some examples:
Specific "blue fish" species:
* Bluefish: These are predatory fish and they eat a variety of smaller fish, squid, crabs, and other crustaceans.
* Blue marlin: These are apex predators that primarily feed on other large fish, including tuna, swordfish, and mahi-mahi.
* Bluefin tuna: These are also apex predators with a diverse diet that includes fish like mackerel, herring, and squid.
Fish with blue scales (generalized):
The diet of fish with blue scales can vary greatly depending on the specific species, their size, and their location. However, some common food sources include:
* Plankton: Small organisms like algae and crustaceans, which are often eaten by smaller fish.
* Smaller fish: Many blue-scaled fish are carnivores and feed on other fish.
* Insects: Some fish, especially those living near the surface, eat insects that fall into the water.
* Crustaceans: Crabs, shrimp, and other crustaceans are a common food source for many fish.
To give you a more precise answer, please specify which "blue fish" you are interested in.