While "shrimp" is often used as both the singular and plural form, the correct plural form is actually "shrimps". This is because the word "shrimp" originated from a Dutch word that already had an "s" at the end.
However, using "shrimp" as the plural is so common that it's considered acceptable in most contexts. So, both "shrimps" and "shrimp" are generally considered correct, but "shrimps" is more technically accurate.