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Human Health Risk Assessment of Mercury in Fish March 2007
' c' s8 f3 L) q+ s5 a* pand Health Benefits of Fish Consumption& h% B( t7 r3 J; C7 }! m
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
B! L! p# i' D; f+ a }present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
1 F2 f2 A w, Rproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
, _, r/ V* @; m8 G' J' N8 }proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
" z" h0 _; O( J4 clevel increasing with age of the fish. In turn, bio magnification along the food chain leads to( s" L1 T2 Q" ]; u e
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
. U( R0 [+ O/ Y! M+ b+ o/ a$ |organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far; W2 Y/ q- L' t2 w' v
lesser extent than methyl mercury.
0 G5 |2 M+ |% _% N0 ~2 ^APPENDIX I
, m! P# l5 }. i% G* L! b' v% o% kSummary data for those samples of fish that were found by the Canadian Food Inspection Agency* G+ G, y# a( N
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.& o; P, |" p3 t& o% x
Samples were collected at the importers= or at domestic processing plants during the periods April 1,$ c$ V, R4 F$ _ R& u+ {
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
: u" C2 w& \6 _: Z9 B+ rconcentration of zero indicates that mercury was not detected above the analytical detection limit.5 T! r& j; H5 F; C+ j' }4 d, o( R+ \1 ~$ E
Total Mercury Concentration
0 O. s+ K9 h( h* f9 |* K& W2 P(ppm)
$ D; @% C2 p1 ?0 ESpecies8 |$ @0 T# z: D# |8 t6 p
No. of2 Q( y) j& G* q" G
samples! ~8 W; c3 K6 d/ v) A* m2 e+ P) u7 }7 b
(N) Mean Median Min Max
8 }8 u: k7 q g0 }) c* kAmberjacks 3 0.17 0.14 0.11 0.27, `! K/ v( f: i8 I' o: O, K! N a
Barracouta 1 0.06 0.06 0.06 0.065 ]6 j8 z/ g' @4 M0 j
Basa 5 0.02 0.02 0.02 0.02
4 G% t* E0 E" X$ n* EBullhead, Brown 2 0.09 0.09 0.07 0.1
/ L, m% @: ~0 m; i( vCapelin 4 0.02 0.02 0 0.05
) ~2 v) f$ [8 D! vCarp 1 0.1 0.1 0.1 0.1- Y9 ^5 P/ O$ _3 i2 k. o9 e
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37; b& Y; I: [- \+ i' D' i3 R+ e
Char, Arctic 5 0.09 0.10 0.05 0.05' g7 A" C2 R) O7 ~: p& i9 w8 n
Clam (various species) 40 0.03 0.01 0 0.08
8 A9 C" z* D$ R, }$ o' ^Cockle, Greenland 1 0.05 0.05 0.05 0.05
) S$ ?" ?( X7 C5 z3 c2 WCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.287 S1 l Z& F% Z+ {
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
9 [- E8 j4 J7 v/ N8 b% B" lCrawfish 1 0.1 0.1 0.1 0.1 a8 \" w" z. f0 \: @
Drum, Freshwater 2 0.22 0.22 0.03 0.4
" n0 l5 f' c, ?$ P. m6 [1 yEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76 Q/ i: T. v7 c$ m8 ~, C3 P4 ~
Eel (species not specified) 107 0.24 0.16 0.01 1.70
! q4 X- X- _0 l5 Z3 A! g3 k( AFlounder (various species) 22 0.06 0.06 0.03 0.12
2 @: V# p4 H! K+ \. K _Haddock 3 0.05 0.05 0.03 0.07 |
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