https://www.gov.mb.ca/nrnd/fish-wildlife/pubs/fish_wildlife/fish/anglers-guide-2022-en.pdf
See page 4.
“Frozen or preserved bait fish may be imported into Manitoba and used in
all fishing divisions. However, anglers importing frozen or preserved bait
fish into Canada may require permit(s). For more information, contact the
Canadian Food Inspection Agency”
However, Last year i wasn’t allowed to bring Manitoba salties back into Manitoba. Had to loop back to ND and dispose of them.