What freshwater fish eats insects and snails grows to 16 inches in length?

There are a few freshwater fish that fit this description, but the most likely answer is the Largemouth Bass.

Here's why:

* Diet: Largemouth Bass are known for their voracious appetite and will eat a wide variety of prey, including insects, snails, frogs, and even other fish.

* Size: They can reach lengths of up to 29 inches, though 16 inches is a common size for adults.

Other possibilities include:

* Pike: Pike can grow up to 4 feet long and are known to eat insects, snails, and other fish.

* Walleye: Walleye can grow to 30 inches and their diet includes insects, snails, and smaller fish.

* Muskellunge: Muskellunge are a close relative of pike and can reach sizes over 50 inches, consuming a similar diet.

However, Largemouth Bass is the most common and widespread fish that fits your description.