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Human Health Risk Assessment of Mercury in Fish March 2007
/ w0 R. Q4 t1 b6 \' X6 Gand Health Benefits of Fish Consumption
: _2 n, e0 y; r0 D; H4 M9 y9 ?With respect to the types of mercury found in fish, both inorganic and organic mercury may be' l, B0 k0 \) _2 g4 `' T
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical# _' S: J: U/ Q! j3 K
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the! x" X: i6 c1 N! R. U, v
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
8 ]. [1 J% c: j) \8 M' H! J1 tlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
: J+ T# X- n7 G& j Y b' khigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other9 Y) W8 I5 W( _- t; ~' W. b
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far& I+ S- p0 s8 f9 u2 S$ W) E
lesser extent than methyl mercury.
7 v2 a3 n/ P& l) l* [APPENDIX I- v! l4 D$ w6 W. e' i' H( c8 u
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
6 W B# s; z5 x1 r5 m(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.' e2 d5 r; {; b+ j z" C! y/ B/ W
Samples were collected at the importers= or at domestic processing plants during the periods April 1,+ \6 o7 l. Y+ U+ m" @
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A0 U, A. u& i; ]9 Z5 z8 {( [
concentration of zero indicates that mercury was not detected above the analytical detection limit.
8 r, Z$ s0 f" C) Q; h4 C( S* wTotal Mercury Concentration
- ` D( H/ r/ T, i+ P* T( w' Y1 l2 r(ppm)
( d+ S* x- s) L. ]; ?0 [7 ~. BSpecies
; }: d& n0 c! b5 n& P3 b2 }No. of5 m, v1 E( T+ M2 O) r4 V# I
samples% b( ~ w% q- Y- ^/ K; s
(N) Mean Median Min Max6 X3 l0 m3 z( [) @3 `) S. b
Amberjacks 3 0.17 0.14 0.11 0.27: c; i4 o1 G: [
Barracouta 1 0.06 0.06 0.06 0.06) m3 Q1 t s- y- e5 T* q
Basa 5 0.02 0.02 0.02 0.02
+ H1 _$ H" q6 X+ h3 EBullhead, Brown 2 0.09 0.09 0.07 0.1$ _! |: x g5 X" a9 d! I, X
Capelin 4 0.02 0.02 0 0.05
0 X8 D% f7 ~% J% b; KCarp 1 0.1 0.1 0.1 0.1+ \6 R" G. h& n& l9 h5 y
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
$ e) ^& m& u% \1 \2 n+ @. XChar, Arctic 5 0.09 0.10 0.05 0.05
: j) S8 S( C8 R. X# s" m, hClam (various species) 40 0.03 0.01 0 0.08+ _0 N" m& \+ G9 {
Cockle, Greenland 1 0.05 0.05 0.05 0.05
5 l- U8 ~# q. g7 L9 {Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28% I _0 ^2 P5 V0 }, p1 \( e
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
m9 G! w5 I2 ]* ?7 ?4 O* s& n+ @9 HCrawfish 1 0.1 0.1 0.1 0.1* k& _1 P) O: \/ n8 K3 U
Drum, Freshwater 2 0.22 0.22 0.03 0.4
0 K2 ^2 { _ d* S8 LEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
+ c% M: Q$ m- TEel (species not specified) 107 0.24 0.16 0.01 1.70, f& L1 f2 u7 j6 K$ ^
Flounder (various species) 22 0.06 0.06 0.03 0.12; m0 j: W. S: a" w$ b1 a
Haddock 3 0.05 0.05 0.03 0.07 |
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