Smaller fish species are more nutritious, lower in mercury and less susceptible to overfishing, a Cornell-led research team ...

But then a giant freshwater fish arrived ... That means the paiche is eating a lot of fish." Unlike other predatory fish like piranha, it only has small, not particularly sharp teeth.

Most larger freshwater fish eat smaller fish. With minnows being among the smallest of fish, they are eaten by virtually everything. Minnows are considered especially effective for species such as ...

The Marine Conservation Society advises to avoid eating eels as no sustainable source is yet available. Eels are a traditional ingredient in the typical French freshwater fish stew, Matelote.