"Die Fische sind nicht groß."

Translation: The fish are not big.

[HristiNi4]

there is a mistake in the English translation. Fish doesn't have a plural form. it should be always "the fish is / is not". not a problem if you are aeare of it but for English and German learners might be misleading.

[mikelucas]

if Die Fische' is plural why 'sind' and not 'seid'

[christian]

"seid" is only used after "ihr".

http://goo.gl/RVagk