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Shellfish Closures
an indicator of contamination in marine
ecosystems in BC |
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Shellfish Closure Areas in
the Georgia Basin
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Graph Trends in BC Shellfish Closures
(Sanitary)
Year
|
Yearly Cumulative Total Closure Area (hectares)
|
| Pre 1976 |
58,107 |
| Pre 1989 |
75,945 |
| 1989 |
79,176 |
| 1990 |
81,012 |
| 1991 |
81,631 |
| 1992 |
82,079 |
| 1993 |
103,576 |
| 1994 |
105,255 |
| 1995 |
105,939 |
| 1996 |
110,287 |
| 1997 |
112,519 |
| 1998 |
111,463 |
| 1999 |
101,855 |
| 2000 |
103,201 |
| 2001 |
159,030 |
| 2002 |
123,727 |
| 2003 |
124,277 |
| 2004 |
123,832 |
Source: Shellfish Section, Environmental Protection Branch, Environment Canada,
Pacific and Yukon Region, 2005.
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Graph data on the production and
value (landed value) of the aquaculture shellfish (bivalves only) industry
in British Colombia
|
Year
|
Production (tonnes)
|
Value ($'000)
|
| Data from DFO |
1986 |
2,877 |
2,545 |
|
"
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1987 |
3,524 |
2,636 |
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"
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1988 |
3,736 |
2,799 |
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"
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1989 |
3,762 |
3,059 |
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"
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1990 |
4,123 |
3,330 |
| Data from Stats Can |
1991 |
4,651 |
4,021 |
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"
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1992 |
4,798 |
4,599 |
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"
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1993 |
5,122 |
5,259 |
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"
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1994 |
5,559 |
6,615 |
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"
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1995 |
6,173 |
9,406 |
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"
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1996 |
6,601 |
10,944 |
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1997 |
4,331 |
7,011 |
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"
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1998 |
6,244 |
8,819 |
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"
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1999 |
6,130 |
9,900 |
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"
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2000 |
6,550 |
13,500 |
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"
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2001 |
8,910 |
17,100 |
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"
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2002 |
8,790 |
14,800 |
" |
2003 |
8,630 |
15,900 |
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Classification of Shellfish
Growing Areas
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| Approved |
- The area is not contaminated with fecal material, poisonous
or deleterious substance or marine biotoxins to the extent that
consumption of the shellfish might be hazardous.
- The median or geometric mean fecal coliform Most Probable Number
(MPN) of the water does not exceed 14/100 mL, for a five-tube
decimal as an approved area with the following exception.
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| Conditionally Approved |
- During those time when harvesting is permitted, the area meets
all of the requirements of an "Approved" area.
- Conditions which preclude harvesting in areas designated "Conditionally
Approved" must be:
- easily identified by routine measurement and reporting; and
- predictable and/or controllable.
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| Closed |
- The area is contaminated with fecal material, poisonous or deleterious
substances to the extent that consumption of the shellfish might
be hazardous.
- The median fecal coliform Most Probable Number (MPN) of the
water exceeds 14/100 mL, for five tube decimal dilution test.
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References used in the Shellfish Closure Indicator:
-
BC Ministry of Agriculture, Food & Fisheries. 2004. The
2003 British Columbia Seafood Industry Year in Review. Ministry of
Agriculture, Food and Fisheries, Victoria, BC. (Also available
online at BC
Ministry of Agriculture, Food & Fisheries).
-
Coopers and Lybrand Report. 1997. Economic potential of the British
Columbia marine aquaculture industry, Phase 1 - Shellfish.
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