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Human Health Risk Assessment of Mercury in Fish March 2007+ ?0 A/ ]* i) B4 j2 c
and Health Benefits of Fish Consumption' L- A9 ?8 |5 l8 E, w9 ~7 M
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
* j- H4 M4 X+ W* z5 bpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
8 P& W: f7 D5 cproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the& ^" H' d. c& F& H ?8 a
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
2 r9 J- H, o4 q0 y. z1 Ulevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
2 w3 Z" }" |9 R! d, j1 b3 Khigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other5 g& j% m* M" T4 e
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far% M- k V4 I) I' i$ m8 x* r
lesser extent than methyl mercury.6 O8 {# [/ y' z# z. C' p9 k
APPENDIX I
8 U8 f# ?2 B* A+ |Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
3 s( Z9 X! x& U5 M% g i' p, q(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
5 y. {: B+ b/ A/ G) S' J2 ^$ L _& T: jSamples were collected at the importers= or at domestic processing plants during the periods April 1,, O, ^" a; P" {& C! d! u1 ]" x
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
4 r+ x. C, x0 l* n' ]concentration of zero indicates that mercury was not detected above the analytical detection limit.
2 [) u5 r6 r! K/ j; w1 e! QTotal Mercury Concentration( H, W n: k" J
(ppm). d* j. K" T6 F8 _4 \2 j1 V6 l* |
Species: ]# ^8 [7 O7 P$ U% w( U
No. of9 R7 X* q' r9 F. Z
samples
; J: X- J- J+ _. h$ P4 s(N) Mean Median Min Max
% l: r% v W+ u# }3 S3 cAmberjacks 3 0.17 0.14 0.11 0.272 u$ m, j$ M6 U3 O K) Q
Barracouta 1 0.06 0.06 0.06 0.060 I7 W( }; t; t1 U3 F$ B+ Q1 [
Basa 5 0.02 0.02 0.02 0.02
. f( {/ Q; R6 T, }* d6 g' iBullhead, Brown 2 0.09 0.09 0.07 0.1
1 e! R* N) Z, {2 r, a8 x; w. uCapelin 4 0.02 0.02 0 0.054 T( F0 ^3 W; p' U/ F7 E
Carp 1 0.1 0.1 0.1 0.1, k. ^+ y; }% ?
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
& B; ?9 K3 ?" I5 s, ^- T2 ZChar, Arctic 5 0.09 0.10 0.05 0.057 X! V: V$ E$ |5 p) e3 y
Clam (various species) 40 0.03 0.01 0 0.08
" ~7 t& [% T* q8 n4 GCockle, Greenland 1 0.05 0.05 0.05 0.05" d. B. _4 V$ w( w( y, \
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
. K) }- ?3 t' e7 hCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37' w7 E( W+ e- o' ^9 u4 A6 n+ e
Crawfish 1 0.1 0.1 0.1 0.1& q K( S/ m$ A
Drum, Freshwater 2 0.22 0.22 0.03 0.4+ K7 e0 X+ E# o% _) v
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76! O4 ?" s$ ^+ u" q
Eel (species not specified) 107 0.24 0.16 0.01 1.701 y; V8 |" \& W% K: U
Flounder (various species) 22 0.06 0.06 0.03 0.12
* h8 h' K I- V" U/ ^( s7 uHaddock 3 0.05 0.05 0.03 0.07 |
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