Islanders are being advised not to harvest shellfish along both the west and east coasts of the islands, because of the danger of paralytic shellfish poisoning.
The Department of Fisheries and Oceans says a recent sample from Rennell Sound found toxicity levels almost six times more than the safe level.
The mussel sample just analysed Tuesday showed levels of 460 micrograms per 100 grams, while the maximum safe level is 80 micrograms.
The DFO advised everyone to avoid harvesting in these areas at this time.
North Beach remains open for razor clams
DFO also notes that area 2 (the west and east coasts) remain closed as usual, but says it is aware that some harvesting is taking place, and is cautioning those doing so accordingly.,