We don't have synonyms for seaperch yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are search, sea perch and seabeach.
(n) :
Alternative form of sea perch, used especially in compound terms, e.g. Japanese seaperch. [Any of various species of saltwater fish in various families, especially in the genus Sebastes.]
(n) :
Alternative form of sea perch, used especially in compound terms, e.g. Japanese seaperch. [Any of various species of saltwater fish in various families, especially in the genus Sebastes.]