Questions:
What melacha of Shabbos is a person violating when rinsing old salted fish and Spanish mackerel?
Is it permitted to rinse old salted fish and Spanish mackerel with cold water to help make it edible?
Learn ט”ז ס’ שי”ח ס”ק ה’ & פרי מגדים אשל אברהם ס”ק טז & לבוש ס’ שי”ח סע’ ד
https://hebrewbooks.org/pdfpager.aspx?req=9223&st=&pgnum=54
https://hebrewbooks.org/pdfpager.aspx?req=41248&st=&pgnum=203
https://hebrewbooks.org/pdfpager.aspx?req=14325&st=&pgnum=154
Learn משנה ברורה ס’ שי”ח ס”ק לו and ביאור הלכה “חוץ & “והדחתן
https://hebrewbooks.org/pdfpager.aspx?req=60388&st=&pgnum=274
Why or why not?
Bring a proof from Rashi
Learn תוס’ דף לט. “כל