In my inventory the image for sea lettuce is not working. When I copy the image URL into my browser it says "not found" 

http://beastkeeper.com/resources/items/food/desert-seaweed.png

Thank you for reporting.

You shouldn't have sea lettuce in your inventory, it should be automatically converted to a respective food type when you pick it up. Do you remember any details about when and how you got it?

Hmm, I'm not sure. I don't explore too often so it may have been there before the conversion.

I thought it strange that I had it, since food is usually gobbled up so quickly, I normally just use silver to feed them. I just checked and it is still in my inventory taking up a spot- not being fed to anything. Most curious... My guess is that I have had it for awhile and had a lapse in thinking and never paid it much attention.

I have sea lettuce item, gotten it form a merchant trade

That could have been it. I still have it sitting in my inventory. 

Do you remember when you got it NightbaneWolf?

from the merchant, i gave you one as a gift, remember?