The Proto-Indo-European word *pik̂sk̂os
Word *pik̂sk̂os
Meaning fish, trout
See also Proto-Indo-European: *pik̂-sk̂o- ‘spotted’
Synonyms *dʰĝʰu-, *peisk, *dhĝhuhₓ-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*k̂on- ‘shell’, *laks- ‘salmon’, *karkr(o)- ‘crab’