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National Shellfish Sanitation Program
Guide for the Control of Molluscan Shellfish
2003

Guidance Documents

Chapter II. Growing Areas

.10 Approved National Shellfish Sanitation Program Laboratory Tests: Microbiological and Biotoxin Analytical Methods

Table of Contents

1. Microbiological Methods

 

Application/

Sample Type

Total Coliform1

Fecal Coliform2

Standard Plate Count3

A1M

APHA

ETCP

 

 

APHA

Decimal Dilution

MPN

 

12 tube single dilution MPN

 

Other

 

Decimal dilution

MPN

 

12 tube single dilution

MPN

 

Decimal dilution

MPN

 

12 tube single dilution

MPN

 

mTEC

 

 

 

Growing Area Survey & Classification

 

 

Seawater

 

X

 

X

 

 

X

 

X

 

X

 

X

 

X

   

 

Controlled Relaying

 

 

Seawater

 

X

 

X

 

 

X

 

X

 

X

 

X

 

X

   

 

Shellfish

 

 

 

   

 

X

       

 

Wet Storage

 

 

Seawater

 

 

 

X

       

 

X

   

 

Shellfish

 

 

 

   

 

X

       

 

Controlled Purification

 

 

UV Effluent

 

 

 

X

       

 

X

   

 

Shellfish

 

 

 

   

 

X

 

X

 

 

X

 

 

Market Shellfish

 
 

 

Shellstock

 

 

 

   

 

X

     

 

X

 

 

Shucked

 

 

 

   

 

X

     

 

X



References

(1) Total Coliform Methods

  • American Public Health Association. 1970. Recommended Procedures for the Examination of Sea Water and Shellfish, 4th Edition, APHA, New York, N.Y. [Decimal Dilution MPN test]

  • American Public Health Association, American Water Works Association, and Water Environmental Federation. 1992. Section 9221. Examination of a 100 ml aliquot by the Multiple Tube Fermentation Method (MTF). Standards Methods for the Examination of Water and Wastewater, 18th Edition, APHA/AWWA/WEF. Washington, D.C. [Decimal Dilution MPN test]

  • Redman, J.H. 1974. A simpler multiple fermentation tube test for monitoring the bacteriological quality of shellfish harvest waters; the examination of twelve 1.0 ml sample portions, p.123-124. In Wilt, D.S. (ed.), Proceedings 8th National Shellfish Sanitation Workshop,. U.S. Food and Drug Administration, Washington, D.C. [12-tube, Single Dilution MPN test]

  • Springer, J.A. 1974. Statistical considerations in using the twelve-tube MPN test for routine monitoring of shellfish waters, p.125-126. In Wilt, D.S. (ed.), Proceedings 8th National Shellfish Sanitation Workshop. U.S. Food and Drug Administration, Washington, D.C. [12-tube, Single Dilution MPN test]

(2) Fecal Coliform Methods

  • 40 CFR 136.3 Table I-A. List of Approved Microbiological Methods

  • A-1M, 1990 AOAC International - Official Methods of Analysis, 15th Edition. Association of Official Analytical Chemists. Washington, D.C. [A-1 Modified MPN test]

  • APHA. 1998. Standard Methods for the Examination of Water and Wastewater APHA, 20th Edition, APHA, Washington, DC

  • American Public Health Association. 1970. Recommended Procedures for the Examination of Sea Water and Shellfish, 4th Edition, APHA, New York, N.Y.

  • Rippy, Scott, et. al, Enumeration of Fecal Coliforms and E. coli in marine and estuarine waters: an alternative to the APHA-MPN approach. Journal Water Pollution Control Federation. August 1987, pg. 795-798.

  • U.S. Food and Drug Administration. 2001. (Revised 12-8-02). NSSP Interpretation, 03-III-@.02-100, Options for the use of the 12-tube, single dilution MPN test. [12-tube, Single Dilution MPN test for seawater]

  • U.S. Food and Drug Administration. 2001 (Revised 12-8-02). NSSP Interpretation 03-XV-.03-100, Method for determining fecal coliform levels in end product depurated shellfish. [12-tube, single dilution MPN test for the controlled purification of shellfish]

  • Cabelli, V.J. and W.P. Heffernan. 1970. Accumulation of Escherichia coli by the northern quahog. Appl. Microbiol. 19:239-244. [ETCP for the controlled purification of hard- and soft-shelled clams]

(3) Standard Plate Count Method

  • American Public Health Association. 1970. Recommended Procedures for the Examination of Sea Water and Shellfish, 4th Edition, APHA, New York, N.Y.

2. Marine Biotoxin Method

Application/Sample Type

Paralytic Shellfish Poison (PSP)

Neurotoxic Shellfish Poison (NSP)

 

Growing Area Survey & Classification

 

 

 

Shellfish

 

X

 

X

 

Controlled Relaying

 

 

 

Shellfish

 

X

 

X

References:

1.      Paralytic Shellfish Poison (PSP) and Neurotoxic Shellfish Poison (NSP) Methods

(American Public Health Association. 1970. Recommended Procedures for the Examination of Sea Water and Shellfish, 4th Edition, APHA, New York, N.Y.


3. Type III and Type IV Microbiological Test Methods

Application/

Sample Type

Total Coliform

Fecal Coliform

Other

Growing Area Survey & Classification

 

 

 

 


 

Seawater

 

 

 

 

 

 

Controlled Relaying

 

 


 

Seawater

 


 

 

Shellfish

 

 

 

 

 

Wet Storage

 



 

Seawater



 

 

Shellfish




 

Controlled Purification

 

 

 

 

 

UV Effluent

 

Type III1


 

 

Shellfish




 

Market Shellfish

 

 

 

 

 

 

Shellstock



 

 

 

Shucked



 

Footnotes:

1. Single step direct mEndo-LES Membrane Filter Technique used in the Newburyport Depuration Plant, Massachusetts.

 

 4. Type III and Type IV Marine Biotoxin Test Method


Application Sample Type

 
NSP

 
DSP

 
AS


Other

Growing Area Survey & Classification

 

 

 

 

 
Shellfish

 

 

Type III1




Controlled Relaying

 

 

 

 

 
Shellfish

 

 

Type III1

 

Footnotes:

1. Peer recognized HPLC Methods with or without clean up.

2. Jellett Rapid Test for PSP

i. Method can be used to determine when to perform a mouse bioassay in a previously closed area.
ii. A negative result can be substituted for a mouse bioassay to maintain an area in the open status.
iii. A positive result can be used for a precautionary closure.
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