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Human Health Risk Assessment of Mercury in Fish March 2007
) U5 e( B3 W! g- X$ a* _5 `% qand Health Benefits of Fish Consumption
: I# M' l3 E/ SWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
8 z. g l7 e: K. ~4 Q2 Q' t. vpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical6 R/ Y0 H2 x- j- y( J
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the, m3 `; P6 N, p& m( |
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
- Y/ ?; K& x: C8 m% Rlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
2 B/ N3 ^) K4 jhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other+ N1 k8 m1 b2 J s
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
- N. q7 j: i% Z! _0 P) C4 \& J: hlesser extent than methyl mercury.5 Y+ i7 m$ y/ @6 t2 v' W/ m0 h
APPENDIX I4 ^% ?0 A' v: e6 P" n5 x( o
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
* }& U) S8 X: |' F. I* n! [ j8 S(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
2 n; w, y+ |& a$ a0 ^! ISamples were collected at the importers= or at domestic processing plants during the periods April 1,! b3 @* ~9 A( U. N- u! ]
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A% ]! n$ Z( i; i. n
concentration of zero indicates that mercury was not detected above the analytical detection limit.
* W" F: I& S; |$ F& ?6 fTotal Mercury Concentration
9 z: c* v2 r$ h' K(ppm)4 W5 a% Q- O1 v* }0 d% t
Species
: H3 j& `2 v }6 n: b9 p9 iNo. of
2 z: o& o5 S4 G6 D! F, i7 jsamples. U2 k/ L r1 Y+ r5 S; x2 E
(N) Mean Median Min Max
2 N ?/ N5 Q" N7 jAmberjacks 3 0.17 0.14 0.11 0.27
7 y" v; g, K% f: {4 o, s( W/ w* uBarracouta 1 0.06 0.06 0.06 0.062 |& h+ Z8 z2 |. ?& N
Basa 5 0.02 0.02 0.02 0.02
: ]. v6 q: ~5 B2 ?* d' HBullhead, Brown 2 0.09 0.09 0.07 0.1
0 L4 N* }# o- p2 ZCapelin 4 0.02 0.02 0 0.05
& P. J3 |# U; q4 Y" kCarp 1 0.1 0.1 0.1 0.1
4 Q6 X+ B! B R0 ]. l7 FCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.373 f) u5 Q* _& y% y [! G
Char, Arctic 5 0.09 0.10 0.05 0.05
2 c# t' I! O i+ N: SClam (various species) 40 0.03 0.01 0 0.08. t2 A6 _& u s% d/ s( S$ @) [
Cockle, Greenland 1 0.05 0.05 0.05 0.05
- d+ |9 G0 }9 Q9 t lCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
- e }% V0 _$ t) M2 ]7 ECrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37* M/ ]6 d+ M- A( m" X% c# e7 a4 x
Crawfish 1 0.1 0.1 0.1 0.1" z9 R/ p+ ?" G
Drum, Freshwater 2 0.22 0.22 0.03 0.4
, L9 f8 @5 ~( J9 uEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.762 Q6 i3 m" x' [6 d
Eel (species not specified) 107 0.24 0.16 0.01 1.70
: ? J9 O0 h" N' ^1 ]# _Flounder (various species) 22 0.06 0.06 0.03 0.12, h4 R( L5 E% _; `; w$ n# _
Haddock 3 0.05 0.05 0.03 0.07 |
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