Massachusetts State Seal An official website of the Commonwealth of Massachusetts Here's how you know

Official websites use .mass.gov

A .mass.gov website belongs to an official government organization in Massachusetts.

Secure websites use HTTPS

A lock icon or https:// means you've safely connected to the official website. Share sensitive information only on official, secure websites.

Skip to main content

Biotoxin Notices

View past notices regarding biotoxin shellfish closures and openings
Skip table of contents
You skipped the table of contents section.

2026 Notices

6/12/26: Shellfish Reopening Following Paralytic Shellfish Poisoning (PSP) in Nauset System (OC2 - OC5)
6/5/26: Paralytic Shellfish Poisoning (PSP) Closures Rescinded (SC53 - SC63)
5/15/26: Shellfish Reopening Following Paralytic Shellfish Poisoning (PSP) Closure in Chatham (SC52)
5/6/26: Shellfish Closure due to Paralytic Shellfish Poisoning (PSP) in Eastham and Orleans (OC2 - OC6)
4/29/26: Shellfish Closure due to Paralytic Shellfish Poisoning (PSP) in Orleans, Chatham, and Harwich (SC52 - SC62)

2025 Notices

3/19/25: PSP Shellfish Closures in Nauset Marsh System (OC2 - OC6)

2024 Notices

Open PDF file, 123.62 KB,  11/27/24: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Salt Pond (English, PDF 123.62 KB)
8/9/24: DSP Closure for Nauset System (OC4 and OC6) Lifted; Open to Harvest of Bivalve Shellfish
7/10/24: DSP Closure Lifted for Nauset System (OC2, OC3, OC5); Open to Bivalve Shellfish Harvest
6/28/24: DSP Closure in Nauset System (OC2-OC6)
6/13/24: Reopening of Nauset System
Open PDF file, 128.2 KB,  3/19/24: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish for Nauset Marsh System (English, PDF 128.2 KB)
Open PDF file, 239.39 KB,  3/19/24: Pre-Cautionary PSP Closure Notice for Namequoit River, Frostfish Cove and Meetinghouse Pond (English, PDF 239.39 KB)
Open PDF file, 126.08 KB,  3/13/24: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Salt Pond (English, PDF 126.08 KB)
Open PDF file, 126.92 KB,  1/11/24: Lifting of PSP (Red Tide) Closure for the Harvest of all Shellfish in Salt Pond (English, PDF 126.92 KB)

2023 Notices

Open PDF file, 126.3 KB,  12/21/23: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Salt Pond (English, PDF 126.3 KB)
Open PDF file, 132.75 KB,  12/9/23: Lifting of PSP (Red Tide) Closure for the Harvest of all Shellfish in Salt Pond (English, PDF 132.75 KB)
Open PDF file, 126.26 KB,  12/1/23: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Salt Pond (English, PDF 126.26 KB)
Open PDF file, 132.71 KB,  7/21/23: Lifting of PSP (Red Tide) Closure for the Harvest of Bivalve Shellfish in Salt Pond (English, PDF 132.71 KB)
Open PDF file, 175.22 KB,  6/15/23: Lifting of PSP (Red Tide) Closure for the Harvest of Bivalve Shellfish in Nauset System (English, PDF 175.22 KB)
Open PDF file, 133.78 KB,  6/8/23: Lifting of PSP (Red Tide) Closure for the Harvest of Bivalve Shellfish in Pleasant Bay (English, PDF 133.78 KB)
Open PDF file, 134.99 KB,  6/2/23: Lifting of PSP (Red Tide) Closure for the Harvest of Bivalve Shellfish in Pleasant Bay, System Remains Closed to Snails and Softshell Clams (English, PDF 134.99 KB)
Open PDF file, 138.86 KB,  5/18/23: Lifting of PSP (Red Tide) Closure for the Harvest of Shellfish in Chatham Harbor (English, PDF 138.86 KB)
Open PDF file, 205.18 KB,  4/14/23: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Chatham Harbor (English, PDF 205.18 KB)
Open PDF file, 205.95 KB,  4/12/23: PSP (Red Tide) Closure Notice for the Harvest of Blue Mussels in Chatham Harbor and Pleasant Bay (English, PDF 205.95 KB)
Open PDF file, 207.56 KB,  3/8/23: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Nauset System (English, PDF 207.56 KB)
Open PDF file, 210.84 KB,  1/5/23: Lifting of PSP (Red Tide) Closure for the Harvest of Shellfish in Salt Pond (English, PDF 210.84 KB)

2022 Notices

Open PDF file, 205.48 KB,  12/22/22: PSP (Red Tide) Closure Notice for the Harvest of all Shellfish in Salt Pond (English, PDF 205.48 KB)
Open PDF file, 208.2 KB,  9/16/22: Lifting of PSP (Red Tide) Closure for North Shore and Boston Harbor Growing Areas (English, PDF 208.2 KB)
Open PDF file, 248.99 KB,  9/16/22: Lifting of PSP Closure for Greater Boston Harbor (English, PDF 248.99 KB)
Open PDF file, 206.25 KB,  9/15/22: Areas of the North Shore (N1 through N14) Open to the Harvest of Shellfish Except Ocean Quahogs and Carnivorous Snails (English, PDF 206.25 KB)
Open PDF file, 536.27 KB,  8/30/22: Partial Re-Opening of Merrimack River (Growing Area N2) for the Harvest of Shellfish (English, PDF 536.27 KB)
Open PDF file, 608.07 KB,  7/29/22: Merrimack River Open to the Harvest of Softshell Clams (English, PDF 608.07 KB)
Open PDF file, 254.95 KB,  7/27/22: Boston and South Shore Open to the Harvest of Shellfish Except Carnivorous Snails and Whole Sea Scallops (English, PDF 254.95 KB)
Open PDF file, 544.54 KB,  7/21/22: Areas of the North Shore (N1and N3 through N14) Open to the Harvest of Shellfish Except Surf clams, Ocean Quahogs and Carnivorous Snails (English, PDF 544.54 KB)
Open PDF file, 253.31 KB,  7/14/22: Partial Re-Opening of Marshfield, Duxbury, Kingston and Plymouth to the Harvest of Blue Mussels (English, PDF 253.31 KB)
Open PDF file, 207.17 KB,  7/13/22: Partial Re-Opening of Plum Island Sound, Ipswich River, and Cranes Beach to the Harvest of Softshell Clams (English, PDF 207.17 KB)
Open PDF file, 207.97 KB,  7/7/22: Partial Re-Opening of Essex Bay (N7) to the Harvest of Softshell Clams (English, PDF 207.97 KB)
Open PDF file, 249.36 KB,  6/23/22: PSP (Red Tide) Closure Notice for Harvest of Blue Mussels on the South Shore (English, PDF 249.36 KB)
Open PDF file, 539.04 KB,  6/23/22: PSP (Red Tide) Closure for the Harvest of Blue Mussels in North Shore and Boston Harbor Growing Areas (English, PDF 539.04 KB)
Open PDF file, 237.73 KB,  06/16/22: PSP (Red Tide) Closure Notice for All Bivalve Shellfish & Carnivorous Snails in N1-N14 (English, PDF 237.73 KB)
Open PDF file, 240.79 KB,  6/14/22: PSP Closure Notice for Blue Mussels in Areas N1 through N14 (English, PDF 240.79 KB)
Open PDF file, 211.13 KB,  6/9/22: Lifting of PSP Closure of Salt Pond, Nauset (English, PDF 211.13 KB)
Open PDF file, 257.02 KB,  6/3/22: Lifting of PSP Closure in OC:2 through OC:5 (English, PDF 257.02 KB)
Open PDF file, 211.96 KB,  4/15/22: Lifting of Pre-Cautionary PSP Closure for all Waters and Flats in Swansea (English, PDF 211.96 KB)
Open PDF file, 156.94 KB,  4/14/22: Pre-Cautionary PSP Closure of all Waters and Flats in Swansea (English, PDF 156.94 KB)
Open PDF file, 153.64 KB,  4/14/22: Closure of Entire Nauset System due to PSP (English, PDF 153.64 KB)

2021 Notices

08/11/321: PSP (Red Tide) Opening for All Bivalve Shellfish Species; Closure Remains for Carnivorous Snails (N7)
Open PDF file, 242.3 KB,  07/30/21: PSP (Red Tide) Opening for All Species Except Carnivorous Snails and Whole Sea Scallops (MB1 - MB14) (English, PDF 242.3 KB)
Open PDF file, 226.97 KB,  07/29/21: PSP (Red Tide) Opening for All Species (N1 - N6, N8, N10 - N28) and Soft Shell & Razor Clams (N9) (English, PDF 226.97 KB)
07/16/21: PSP (Red Tide) Closure Notice for All Bivalve Shellfish and Carnivorous Snails in N1 - N28 and MB1 - MB14
Open PDF file, 186.56 KB,  07/15/21: PSP (Red Tide) Closure Notice for Softshell & Razor Clams (N1 - N28) and All Shellfish (MB1 - MB14) (English, PDF 186.56 KB)
Open PDF file, 185.61 KB,  07/14/21: PSP (Red Tide) Closure for Blue Mussels (N1 - N28 & MB1 - MB14) (English, PDF 185.61 KB)
Open PDF file, 253.34 KB,  0616/21: PSP (Red Tide) Opening for All Species Except Moon Snails (Nauset System: OC2 - OC6) (English, PDF 253.34 KB)
Open PDF file, 206.97 KB,  03/17/21: PSP (Red Tide) Closure Notice for Shellfish (Nauset System: OC2 - OC6) (English, PDF 206.97 KB)

2020 Notices

05/28/20: PSP (Red Tide) Opening for All Shellfish Species in Nauset System (OC:2-OC:6) Effective May 29
4/30/20: (Red Tide) Shellfish Opening for All Species Except Blue Mussels and Moon Snails (OC2 - OC6)
Open PDF file, 143.67 KB,  3/19/20: PSP Closure Notice Nauset OC 2 - OC 6 (English, PDF 143.67 KB)

2019 Notices

Open PDF file, 74.27 KB,  10/10/19: PSP (Red Tide) Shellfish Opening for All Species Except Whole Sea Scallops and Carnivorous Snails (N1 - N14) (English, PDF 74.27 KB)
Open PDF file, 78.39 KB,  08/07/19: PSP (Red Tide) Shellfish Opening for Blue Mussels & Razor Clams (N1 - N14) (English, PDF 78.39 KB)
Open PDF file, 74.43 KB,  07/30/19: PSP (Red Tide) Shellfish Opening on North Shore for Softshell Clams (N1 - N14) (English, PDF 74.43 KB)
Open PDF file, 176.38 KB,  07/19/19: PSP (Red Tide) Shellfish Opening Notice (MB1 - MB14) (English, PDF 176.38 KB)
Open PDF file, 67.7 KB,  06/26/19: PSP (Red Tide) Shellfish Closure for the North Shore (N1 - N14) (English, PDF 67.7 KB)
Open PDF file, 74.22 KB,  06/20/19: PSP (Red Tide) Shellfish Closure for the North Shore (N1 - N6, N8, N10-N14) (English, PDF 74.22 KB)
Open PDF file, 74.13 KB,  06/20/19: PSP (Red Tide) Shellfish Closure for Gloucester (N9) (English, PDF 74.13 KB)
Open PDF file, 141.39 KB,  06/19/19: PSP (Red Tide) Shellfish Closure for the South Shore (MB1 - MB14) (English, PDF 141.39 KB)
Open PDF file, 77.46 KB,  06/18/19: PSP (Red Tide) Shellfish Closure for Essex Bay (N7) (English, PDF 77.46 KB)
Open PDF file, 184.9 KB,  06/07/19: Opening of OC2 - OC6 (Nauset) to Harvest of Bivalve Shellfish (English, PDF 184.9 KB)
Open PDF file, 135.47 KB,  04/24/19: PSP (Red Tide) Shellfish Closure in Nauset System (OC2-OC6) (English, PDF 135.47 KB)

2018 Notices

Open PDF file, 135.05 KB,  04/04/2018 PSP (Red Tide) Closure in Nauset System (OC2-OC6) (English, PDF 135.05 KB)

2017 Notices

Open PDF file, 551.43 KB,  09/22/2017 PSP (Red Tide) Opening for All Shellfish except Ocean Quahogs and Carnivorous Snails - N1-N14 (English, PDF 551.43 KB)
Open PDF file, 314.72 KB,  09/22/2017 PSP (Red Tide) Opening for All Shellfish except Ocean Quahogs and Carnivorous Snails - Essex Bay (N7) (English, PDF 314.72 KB)
Open PDF file, 295.73 KB,  07/17/2017 PSP (Red Tide) Opening for Softshell and Razor Clams - Essex Bay (N7) (English, PDF 295.73 KB)
Open PDF file, 84.87 KB,  07/09/2017 PSP (Red Tide) Closure for All Shellfish - Essex Bay (N7) (English, PDF 84.87 KB)
Open PDF file, 187.29 KB,  06/28/2017 PSP (Red Tide) Closure for Blue Mussels - N1-N6 and N8-N14 (English, PDF 187.29 KB)
Open PDF file, 263.44 KB,  06/23/2017 PSP (Red Tide) Closure for Blue Mussels - Essex Bay (N7) (English, PDF 263.44 KB)
Open PDF file, 314.15 KB,  06/16/2017 PSP (Red Tide) Opening - Salt Pond, Eastham (OC6) (English, PDF 314.15 KB)
Open PDF file, 562.13 KB,  06/09/2017 PSP (Red Tide) Opening in Nauset System (OC2-OC5) (English, PDF 562.13 KB)
Open PDF file, 478.31 KB,  5/3/17 PSP (Red Tide) Closure in Nauset Estuary (OC2-OC6) (English, PDF 478.31 KB)

2016 Notices

2015 Notices

Open PDF file, 104.51 KB,  5/12/15 PSP Closure - Nauset System (OC:2-OC:6) (English, PDF 104.51 KB)

2014 Notices

Open PDF file, 99.75 KB,  9/12/14 PSP Opening - Surf Clams (N:1-N:14) (English, PDF 99.75 KB)
Open PDF file, 43.19 KB,  7/3/14 PSP Opening (N1-N14) (English, PDF 43.19 KB)
Open PDF file, 60.52 KB,  7/1/14 PSP Opening - Razor & Softshell Clams (N9 & N10) (English, PDF 60.52 KB)
Open PDF file, 61.99 KB,  6/19/14 PSP Opening - Razor & Softshell Clams (N4 & N7) (English, PDF 61.99 KB)
Open PDF file, 60.62 KB,  6/2/14 PSP Closure - Blue Mussels (N:1-N:14) (English, PDF 60.62 KB)
Open PDF file, 65.99 KB,  6/4/14 PSP Closure - (N:1, N:3-N:14) (English, PDF 65.99 KB)

2013 Notices

Open PDF file, 78.55 KB,  6/19/13 PSP Opening - Bivalve Shellfish (OC:6) (English, PDF 78.55 KB)
Open PDF file, 119.08 KB,  6/12/13 PSP Opening - Bivalve Shellfish (OC:2-OC:5) (English, PDF 119.08 KB)
Open PDF file, 101.65 KB,  4/24/13 PSP Closure - All Shellfish in Nauset System (OC:2-OC:6) (English, PDF 101.65 KB)

Help Us Improve Mass.gov  with your feedback

Please do not include personal or contact information.
Feedback