Fish of equal value - right! (4)

I believe the answer is:

parr

I'm a little stuck... Click here to teach me more about this clue!

'fish' is the definition.
(I've seen this in other clues)

'equal value right' is the wordplay.
'equal value' becomes 'par' (par value is a kind of value. I am not sure about the 'equal' bit.).
'right' becomes 'R' (common abbreviation).
'par'+'r'='PARR'

'of' is the link.

Can you help me to learn more?

(Other definitions for parr that I've seen before include "Young salmon; Queen Catherine ---" , "Henry's sixth (his third 7!)" , "Catherine --, last wife of Henry VIII" , "Young salmon or trout" , "Fish" .)

I've seen this clue in the Sydney Morning Herald.

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