Fish egg

Happy New Year, eveyone!

I am working at a Japanese sushi restaurant over the holidays.

In the sushi training, there is a plate of 'fish egg'.

Customers asking what it is, and I tell them it's kind of 'fish egg', then they say something starting with 'C'.  I think it was 'cavi' somthing which I can't recall now.

The colour of the eggs are a bit red, and it's normally placed on the top of a rolled sushi.

Could anyone guess what it is?

Thanks in advance.

It was 'cavier'.

I looked up the dictionary, yes, it's got the right meaning.

Now I finally figure out what word I can use for it.

Thanks!

What about 'roe'?

Is there any difference in meaning?