The Connecticut Department of Environmental Protection cooperated with the Department of Agriculture, Bureau of Aquaculture to publish the Connecticut  Shellfish Classification data. More recent information may be available from the Department of Agriculture since the time this information was originally published in 2007. For information or questions on shellfish area classifications contact the Connecticut Department of Agriculture, Bureau of Aquaculture (DA/BA). Mailing address: P.O. Box 97, Milford, CT, 06460, USA. Voice: 203-874-0696. Fax: 203-783-9976. E-mail: dept.agriculture@snet.net. Final authority for the classification of any shellfish area rests with the DA/BA.

One of a set of three 1:24,000-scale datalayers that represent the classifications of shellfish growing waters for the State of Connecticut shoreline towns. This datalayer is composed of polygon features. The shellfishing areas are delineated and classified by the DA/BA, which is the state shellfish control authority in Connecticut. The Connecticut Department of Environmental Protection (DEP) applied information from the DA/BA to the hydrography data to create digital data of shellfish area classifications. DA/BA reassesses pollution sources and shellfish growing areas annually. The digital data is current to that effective date or last amended date recorded on the assessment date list (see supplemental information). This data is subject to change and the DA/BA may have more recent information for some areas.

DEP cooperated with the DA/BA to publish the DA/BA Shellfish Area Classifications data. More recent shellfish classification information may now be available from DA/BA since the time this information was originally published in 2007.


The three classification datalayers are feature based. Waterbodies, such as rivers and lakes and ponds, that appear as area features in the hydrography datalayer are classified in the Shellfish Area polygon shapefile. Smaller water bodies, such as streams and creeks, that appear as line features in the hydrography datalayer are classified in the Shellfish Area line shapefile. A separate point shapefile contains the marinas that are classified by DA/BA. Contact DA/BA or local health departments for additional information regarding the classification of marinas and anchorage areas.

Three additional datalayers add to the classification picture. Markers, such as buoys, demarcation signs and piers, are referred to in DA/BA text describing the shellfish area classifications. The town boundary lines as depicted on DA/BA oyster/shellfish ground charts extend to the Connecticut/New York mid-Long Island Sound boundary line. The jurisdiction line on the charts indicates the boundary between state and town jurisdictional control over shellfish grounds. The jurisdiction line is separate from the shellfishing area classifications.

*Please note that in some cases the town boundary line and the shellfish jurisdiction line are different and are so noted.

To provide a digital version of the shellfish area classifications for shellfish growing areas. This data is for general information and is used by DA/BA to prepare small town maps of shellfish area classifications. Contact the DA/BA for questions or comments regarding classification specifics.

CONTENTS: Classification definitions

CLASSIFICATIONS:
Approved 
Conditionally Approved 
Restricted-Relay/Depuration 
Conditionally Restricted-Relay/Depuration 
Restricted-Relay 
Conditionally Restricted-Relay 
Prohibited 

DEFINITIONS: 
For complete information refer to: National Shellfish Sanitation Program, Model Ordinance - 1999 revision. The 1999 Model Ordinance is online at http://vm.cfsan.fda.gov/~ear/nsspotoc.html.
For information and publications contact: Director, Program and Enforcement Branch HFS-417, Office of Seafood, Food and Drug Administration, 5100 Paint Branch Parkway, College Park, MD 20740-3835, tel (301) 436-2303, fax (301) 436-2599. 
State of Connecticut Department of Agriculture/Bureau of Aquaculture(DA/BA)
Shellfishing Area Classifications 
Last modified: 10/27/02         Visit our web site at:  www.ct.us/doag 

A shellfish growing area is any area which supports or could support the growth and/or propagation of molluscan shellstock (live clams, oysters, mussels and scallops in their shell). All shellfish growing areas are classified in accordance with the Interstate Shellfish Sanitation Conference (ISSC) National Shellfish Sanitation Program Model Ordinance (NSSP-MO). These classifications established to minimize health risks, may restrict the taking and use of shellfish from some areas. No fresh water areas have been classified for the harvesting of shellfish. 
Shellfishing areas are reevaluated annually for improvements or degradation of water quality and status of pollution sources. An area which does not meet all of the NSSP-MO criteria for its current classification, due to new or existing pollution sources or degradation of water quality, will have its classification downgraded. Elimination of biological and chemical hazards including pollution sources, and a sufficient quantity of satisfactory seawater data collected under adverse hydrographic and meteorologic conditions may result in upgrading of the current classification. Town efforts that result in evidence supporting a reclassification are carefully considered. The work conducted by the Connecticut Department of Agriculture/Bureau of Aquaculture (DA/BA) to classify waters in each town, results in a Comprehensive Evaluation Report,including a shoreline survey and water quality data every twelve (12) years, an Annual Assessment Report of shoreline changes and data analyses and a Triennial Evaluation Report every three (3) years. These reports describe pollution sources and their potential impact, statistical analyses of seawater samples, corrective actions, and classification recommendations that provide evidence of conformance to the NSSP-MO. These reports are submitted to the US Food and Drug Administration (USFDA) for review and evaluation of DA/BA compliance with the NSSP-MO. 
At the discretion of the DA/BA, any shellfish area, regardless of its classification may be temporarily closed to all activities when a potential public health emergency exists as a result of a storm event or flooding, a sewage, chemical, or petroleum discharge or a hazardous algal bloom.  
NOTE: No shellfish may be brought to shore during emergency closures. 

The shellfishing area classifications and criteria are specified by the NSSP Model Ordinance and the Connecticut General Statutes. They are summarized as follows: 

APPROVED AREA
A shellfishing area classification that conforms to NSSP-MO criteria for the growing and harvesting of shellfish for recreational and commercial use and direct consumption. Commercial operations, such as harvesting and direct marketing of shellfish must be licensed by the DA/BA. 
Activities allowed in Approved areas during "emergency" closures are limited to relaying operations as specified on the license for such activity, or for the cultivation of shellfish including consolidation or inspection of product, and predator control (mopping for starfish). Prior to conducting any activity in an Approved area during an "emergency" closure, the licensee must notify the local shellfish control authority and State of Connecticut Department of Environmental Protection (DEP) Division of Law Enforcement ((860)-424-3333 24-hour Dispatcher) of their intended activity. 
Note: No shellfish may be brought to shore from Approved areas during "emergency" closures. 
This classification is determined by a sanitary survey conducted by DA/BA with local assistance. The sanitary survey demonstrates conformance to NSSP-MO bacteriological criteria and the absence of dangerous levels of poisonous and deleterious substances. A sanitary survey consists of a shoreline survey to identify and assess all actual and potential pollution sources, hydrographic and meteorologic affects, water quality examination and assessment of standards. 
The fecal coliform geometric mean of the water samples must not exceed 14 fecal coliforms per 100 ml, using the most probable number (MPN) method, and not more than 10.0% of all sample results may be >43 fecal coliforms per 100 ml. A minimum of five (5) seawater samples must be collected annually during adverse pollution conditions. A minimum of 15 seawater samples, collected over a three-year period, during adverse pollution conditions, must be used for a geometric mean. Adverse pollution conditions have been defined by the NSSP-MO as a state or situation caused by meteorological, hydrological or seasonal events and point or non-point source discharges that have historically resulted in elevated fecal coliform levels in a particular growing area. 

CONDITIONALLY APPROVED AREA 
A shellfishing area classification that predictably does not conform to "Approved" area criteria due to the occurrence of specified hydrologic or meteorologic events or conditions, but will predictably return to the "Approved" area criteria. Activities allowed in Conditionally Approved areas during a "closed" status are limited to relaying operations and seed oyster harvesting as specified on the license for such activity, or for the cultivation of shellfish including consolidation or inspection of product, and predator control (mopping for starfish). Prior to conducting any activity in a Conditionally Approved area during the "closed" status, the licensee must notify the local shellfish control authority and State of Connecticut Department of Environmental Protection (DEP) Division of Law Enforcement ((860)-424-3333 24-hour Dispatcher) of their intended activity. Activities allowed in the Conditionally Approved area during "open"status are the same as those for an Approved area. 
Note: No shellfish may be brought to shore from Conditionally Approved areas during a "closed" status. 
The Conditionally Approved area shellfishing status is designated "open" for shellfishing when it conforms to the written management plan, a Memorandum of Understanding (MOU). A MOU is required for a Conditionally Approved area which describes the management criteria for the area as well as the standards for an Approved classification when the status is designated "open". The area status is designated "closed" for shellfishing when it does not conform to the Approved classification or performance standards specified by the MOU. The duration of closure is based upon a sanitary survey and established performance standards specified in the MOU. The area is opened and closed by the shellfish control authority as specified in the MOU. 
The bacteriological standard for the Conditionally Approved Area when "open" is the same as the Approved Area classification. A minimum of one (1) seawater sample per station must be collected each month when the area is designated "open". Sampling after a closure may be required prior to reopening. 

RESTRICTED-RELAY/DEPURATION 
A shellfishing area classification that conforms to NSSP-MO criteria that allows the area to be used by DA/BA licensed operations for the relaying of shellfish to a depuration plant for controlled purification, to designated beds in Approved or Conditionally Approved areas for natural cleansing or to areas satisfactory to the DA/BA, excluding Prohibited, Conditionally Restricted-Relay, and Restricted-Relay areas. These shellfish may not be directly harvested for market nor consumed prior to the purification process involving relay or depuration. 
This classification requires a sanitary survey and conformance with specified bacteriologic standards. The fecal coliform geometric mean of the water must not exceed 88 per 100 ml, using the most probable number (MPN) method, and not more than 10 percent of the samples may exceed a MPN of 260 per 100 ml. A minimum of five (5) seawater samples from each station must be collected annually during adverse pollution conditions. 
This classificationdetermination is not routinely made due to the strict water quality criteria, limited resources in these small areas, and lack of depuration plants accepting "Restricted for Depuration" shellfish. Determinations are made when requested by the industry. 

CONDITIONALLY RESTRICTED-RELAY/DEPURATION 
A shellfishing area classification that predictably does not conform to Restricted-Relay/Depuration area criteria due to the occurrence of specified hydrologic or meteorologic events or conditions, but will predictably return to the Restricted-Relay/Depuration area criteria. A written area management plan (MOU) must be developed for a conditional area. The MOU shall be based upon an evaluation of potential pollution sources that may impact the area and their correlation with predictable environmental conditions or other factors affecting the distribution of pollutants. 
The Conditionally Restricted-Relay/Depuration area is designated "open" when it conforms to the standards for a Restricted-Relay/Depuration classification. The shellfish can be relayed to a depuration plant for controlled purification or to designated beds in an Approved or Conditionally Approved area for natural cleansing or to areas satisfactory to the DA/BA, excluding Prohibited, Conditionally Restricted-Relay, and Restricted-Relay areas. The area status is designated "closed" when it does not conform to the Restricted-Relay/Depuration classification as specified in the management plan. The duration of closure is conditional based upon a sanitary survey and established performance standards specified in the management plan. 
This classification requires a sanitary survey and conformance with specified bacteriological standards. The bacteriological standard for this water classification when designated "open" is the same as the Restricted-Relay/Depuration area. A minimum of one (1) seawater sample from each station must be collected each month when the area is designated "open." 
This classification determination is not routinely made due to the strict water quality criteria, limited resources in these small areas, and lack of depuration plants accepting "Restricted for Depuration" shellfish. Determinations are made when requested by the industry. 

RESTRICTED RELAY 
A shellfishing area classification where DA/BA allows aquaculture, relay or transplant activities in conformance to NSSP-MO criteria. Operations may be licensed to relay shellfish to designated beds in Approved or Conditionally Approved areas for natural cleansing. 
These shellfish may not be directly harvested for market or consumed prior to a minimum purification period of 14 consecutive days after being relayed to Approved or Conditionally Approved"open" areas with a water temperature of 50 degrees Fahrenheit (10 degrees Celsius) or greater. DA/BA may require the shellfish purification time to be longer than 14 consecutive days, based upon shellfish purification verification studies. 
This classification requires a sanitary survey and collection of water quality data. A minimum of five (5) seawater samples from each station must be collected annually during adverse pollution conditions. 

CONDITIONALLY RESTRICTED-RELAY 
A shellfishing area classification that predictably does not conform to Restricted-Relay area criteria due to the occurrence of specified events or conditions, but predictably returns to the Restricted-Relay area criteria. A written management plan, or Memorandum of Understanding (MOU), must be developed for a conditional area. The MOU shall be based upon an evaluation of actual or potential pollution sources that may impact the area and their correlation with predictable environmental conditions or other factors affecting the distribution of pollutants. 
The Conditionally Restricted-Relay area is designated "open" for relay of shellfish when it conforms to the MOU and the standards for a Restricted-Relay classification. The area status is designated "closed" for shellfish relay when it does not conform to the Restricted-Relay classification as specified in the MOU. 
The duration of closure is based upon the performance standards specified in the MOU. A minimum of one (1) seawater sample per station must be collected each month when the area is designated "open". 

PROHIBITED AREA
A shellfishing area classification which does not conform with other NSSP-MO classification criteria. This classification prohibits the harvesting of shellfish for any purpose except depletion or aquaculture operations (such as seed oystering) licensed by the DA/BA. 
A Prohibited shellfish growing area is closed for the harvesting of shellfish (except licensed aquaculture operations) at all times. This classification may be assigned to specified areas with direct exposure to fecal, industrial or environmental contamination to the extent that the consumption of shellfish harvested in the area may be potentially hazardous to health after a shellfish purification (relay) period of less than six (6) months are classified "Prohibited". Aquaculture operations may be suspended for such areas. 
Areas with incomplete sanitary surveys, including lack of water quality data analysis, lack of a complete shoreline survey, or when the area does not conform to the requirements for the classification of a Restricted-Relay area or better also require this classification. 
Environmental contamination may also include specified areas in which shellfish contain 80 micrograms or greater of paralytic shellfish poisoning toxin per 100 grams of shellfish meat, contain other unacceptable levels of marine biotoxins, or contain unacceptable levels of poisonous or deleterious substances or organisms are classified as Prohibited when such events are constant or reoccurring. Aquaculture operations may be suspended for such areas. 

RELAYING 
The transfer of shellfish from restricted areas, conditionally restricted areas in the open status, or conditionally approved areas in the closed status to approved or conditionally approved areas in the open status for the reduction of pathogens as measured by the coliform indicator group or poisonous or deleterious substances that may be present, by using the ambient environment as a treatment process. 

DEPURATION 
The process of using a controlled, aquatic environment to reduce the level of bacteria and viruses in live shellfish. 

MARINA
Any water area with a structure (dock, basin, floating dock, etc.) which is utilized for docking or otherwise mooring vessels and constructed to provide temporary or permanent docking space for more than ten (10) boats. 

CONTROL OF AREAS USED AS A MARINA
The suitability of some areas for harvesting shellfish will be impacted if the area is used as a marina. The biological and chemical contamination associated with marina facilities may be of public health significance. A prohibited, conditionally restricted or conditionally approved classification of that area within the marina proper is required. Similar classifications will be required if waters adjacent to the marina are impacted. A dilution analysis will be used for making marina closure determinations.

Publication date. Includes data from 1990 to publication date

None. The data is in the public domain and may be redistributed.

No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:24,000 scale (1 inch = 2,000 feet). Although this data set  has been used by the State of Connecticut, Department of Agriculture and Department of Environmental Protection , no warranty, expressed or implied, is made by the State of Connecticut, Department of Agriculture and Department of Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Agriculture and Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Agriculture and Department of Environmental Protection as the source for this information.

Includes Shellfish Area Classification polygon and line features. Information encoded about these features includes CLASS information and standard cartographic symbology classification schemes. Use the CLASS to uniquely identify features. Use the AV_LEGEND attribute to symbolize features by type on a map.  Use CLASS or  AV_LEGEND to label features on a map.

Shellfish Area Classifications (polygon features) and Shellfish Area Class Lines (line features) conatin the same attributes with one exception. The line features do not contain the attribute AREANAME.

Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. 

Line features conform to the following topological rules. Lines are single part. There are no duplicate lines. Lines do not self overlap. Lines do not overlap other lines. Lines intersect only at nodes, and nodes anchor the ends of all lines. Lines do not overshoot or undershoot other lines they are supposed to meet and intersect.

The tests of logical consistency were performed by the State of Connecticut using ESRI ArcInfo software to maintain feature topology in ArcInfo coverage format. The data is topologically clean. The ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 10 feet (dangle length). The data was converted to ESRI Shapefile format for distribution.

The completeness of the data reflects the feature content of the data sources, which include the shellfish area classifications annual or triennial assessment  maps and reports from the State of Connecticut, Department of Agriculture, Bureau of Aquaculture. The Shellfish Area Classifications layer is complete in the sense that it accurately reflects the contents of the shellfish area classifications information available at the time the State of Connecticut, Department of Environmental Protection created the layer. This data is updated.

The Shellfish Area Classifications layer retains the feature types and information identified by the State of Connecticut, Department of Environmental Protection and obtained from the shellfish area classifications annual or triennial assessment  maps and reports from the DA/BA. All attributes have valid values. Values are within defined domains. The accuracy test for the CLASS attribute values was conducted by comparing the Shellfish Area Classifications information presented in the source data with 1:24,000-scale check plots or interactive displays of the data on a computer graphic system. These check plot maps and computer displays depicted and labeled the Shellfish Area Classifications features in different colors based on CLASS values for comparison with the original data source. CLASS is the English language equivalent of (decodes) the AV_LEGEND field values. AV_LEGEND is abbreviated classifications of Shellfish Area Classifications features.  AREANAME attribute is the name of specific shellfish areas designated within larger classified areas. CLASS,  AV_LEGEND,  AREANAME attribute values were manually entered.

The horizontal positional accuracy of the HYDROGRAPHY base data from the USGS 7.5 minute topographic quadrangle maps complies with the United States National Map Accuracy Standards for 1:24,000 scale maps. According to this standard, not more than 10 percent of the locations tested are to be in error by more than 1/50 inch (40 feet) measured on the publication scale of a USGS 7.5 minute topographic quadrangle map. Shellfish Area Classifications feature locations were built on this base or interpolated from features, such as navigation buoys, rocks, shoreline features or other markers, found on NOAA navigation charts for Long Island Sound. Interpolated locations do not conform to the United States National Map Accuracy Standards.

Shellfish Area Classification Poly

Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.

The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.