There is no violation unless you transport the fish before a complete 24 hour period has elapsed. You get to the cottage Friday at 4pm, start fishing catch up to your 50 fish. Next day you do the same, go home Sunday. Number one thing to keep handy if you ever get stopped is a receipt for the rental outlining the days you were there. Make sure you keep the fish or fillets easily countable, not in one great big lump, check the regs for that too.