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Human Health Risk Assessment of Mercury in Fish March 2007
2 u3 i( b- t/ D6 Iand Health Benefits of Fish Consumption9 [1 R/ ]5 U/ E I; Y& K5 {+ H
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
* C' \- A9 J \2 }3 ], a& W* g* Hpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
: `( f3 T4 r+ T, |8 cproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the$ x* Q4 ^+ ?' ]# Y
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
0 `' ^% x, O9 _2 D: o1 k" T% Q! ]level increasing with age of the fish. In turn, bio magnification along the food chain leads to h# [8 k# |6 v* `) \
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other b7 |* k7 S9 s/ w. m$ \
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
6 H% w1 Z8 Y9 e0 c) d6 I& Glesser extent than methyl mercury.
, [6 [% r2 K2 {. K0 a, ?4 l" fAPPENDIX I/ L) [3 j3 W& o( v* E
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
. f2 y6 v4 \& |8 W7 t) d' v(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.. K: A( A5 e; `9 {/ @7 a' g
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
% @% n5 W* h$ p2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
% E" `; W B! J7 D1 Tconcentration of zero indicates that mercury was not detected above the analytical detection limit.2 U# D7 }) x+ J; @* e9 T
Total Mercury Concentration# X% ]+ U: t: G
(ppm)
2 v; ?( h; v8 n# ~Species( J9 d+ Z. |* ~5 \- R% r$ }( N
No. of
9 d$ r3 }. {4 c. asamples! ~" _' x: {6 O4 d% R6 E
(N) Mean Median Min Max
. i$ g, V6 i6 |* iAmberjacks 3 0.17 0.14 0.11 0.27
0 X* a! ?1 E i2 B0 OBarracouta 1 0.06 0.06 0.06 0.06
% M y' J9 d, K8 k0 _Basa 5 0.02 0.02 0.02 0.024 g5 \6 C) s q" I
Bullhead, Brown 2 0.09 0.09 0.07 0.1
, N0 n7 H" T0 R/ z# x M& l6 N# wCapelin 4 0.02 0.02 0 0.05
% s+ _, F5 x7 B; Z* uCarp 1 0.1 0.1 0.1 0.17 m2 N' y3 \4 L' I
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37% s2 P8 Z7 H6 l8 n
Char, Arctic 5 0.09 0.10 0.05 0.05. r' X8 T# G4 R& I% d% r" H8 u
Clam (various species) 40 0.03 0.01 0 0.08
2 q% M7 G9 [# R( M$ S9 hCockle, Greenland 1 0.05 0.05 0.05 0.05. [5 O" G {' U' Q+ [$ V% V
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
5 Q" q3 Y9 i6 i* dCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.370 h; ~) o6 ]) j, K6 Z8 A R/ ?8 ]
Crawfish 1 0.1 0.1 0.1 0.1
# D" J% R; Y& [+ H8 y: ]$ `Drum, Freshwater 2 0.22 0.22 0.03 0.4
9 I8 t3 L4 U, [! K6 c7 H& s" mEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76 r; X' L% s u- w! e+ z6 q
Eel (species not specified) 107 0.24 0.16 0.01 1.709 b- ^) z- ~2 s% T$ {6 Q
Flounder (various species) 22 0.06 0.06 0.03 0.12
5 \. H+ {: T& U& K, gHaddock 3 0.05 0.05 0.03 0.07 |
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