It is, yes. If you had a tank with two different catfish species in, 'catfishes' would be a valid term to use, for example. "These catfishes live together in the tank."
They are harmless.
The word crises is a plural word; it is the plural form of the word crisis.
Cornells Ouwehand has written: 'Namazu-e and their themes' -- subject(s): Catfishes, Catfishes in art, Folklore
An aspredinid is a member of the Aspredinidae, a small American family of catfishes, often known as banjo catfishes, comprising around 39 species.
There is no plural word for if.
The plural word for delay is delays.
catfish food.
The plural form for the demonstrative pronoun this is these.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
the plural word is comedones
No it's a singular word. A plural word would be "have".
The plural of the word "raisin" is "raisins."