What fish is a royal fish?

Here's why:

* Historical Significance: Sturgeon were highly prized for their meat, roe (caviar), and swim bladders (used for isinglass). They were considered a delicacy fit for royalty.

* Legal Status: In England, sturgeon were declared "royal fish" in the 14th century. This meant that any sturgeon caught in English waters belonged to the Crown.

* Modern Day: While sturgeon are still considered a delicacy, their populations have declined drastically due to overfishing and habitat loss. They are now a critically endangered species, and fishing for them is strictly regulated.

It's important to note that the term "royal fish" can also be used more broadly to refer to any fish species that is highly prized and considered fit for royalty. However, the historical and legal context specifically ties the term to sturgeon in England.