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Human Health Risk Assessment of Mercury in Fish March 20076 I1 a; g$ j$ d
and Health Benefits of Fish Consumption" R8 L1 i; _( \+ c
With respect to the types of mercury found in fish, both inorganic and organic mercury may be* ]/ \$ R- {/ ?3 F8 P- x; O9 z
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical" f) E! Q# H, G1 e
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the% t6 N; j) e' y8 c; n
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
+ @7 A2 V/ L0 r5 b2 C1 t; }level increasing with age of the fish. In turn, bio magnification along the food chain leads to: s9 o3 E, M4 ?& R
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
5 m8 ^, M$ v+ ^3 h5 w zorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
8 b; K6 F2 ?0 L2 }) D! [lesser extent than methyl mercury.
9 i8 }( s4 @4 g5 p, }APPENDIX I7 V* a: ~# @% v% B: ^5 m$ l
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
. D% l ]* R& \(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.9 s2 u( S* i, ^
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
! Q, z6 Z+ l) o# Y# H! ?2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
% I& o8 {% ]" a& ?# ^concentration of zero indicates that mercury was not detected above the analytical detection limit.$ w& ~* [2 ?# u% Q6 Q4 k$ H
Total Mercury Concentration, b6 \8 W' U' a; C5 c! M3 z7 u- c8 Y
(ppm)
3 }% y$ `( T9 ^. P LSpecies* @; ?9 D, h- U! q. U. q6 l
No. of& b, q' L# p$ [5 z6 V0 D2 }9 Y
samples
* N9 |! [& o$ ]. {8 p& m(N) Mean Median Min Max
: a3 ] {* z1 V* Y2 V1 q7 kAmberjacks 3 0.17 0.14 0.11 0.27
% P2 N0 { f6 o, {+ `" wBarracouta 1 0.06 0.06 0.06 0.06! |" a7 w. q2 @$ H% u$ M
Basa 5 0.02 0.02 0.02 0.02
" t# g! t( |/ {* m* p5 RBullhead, Brown 2 0.09 0.09 0.07 0.10 C1 \. k/ r s. o# N. C, O8 B
Capelin 4 0.02 0.02 0 0.05
3 L* u7 ~' I! S+ eCarp 1 0.1 0.1 0.1 0.1
! @4 E3 F2 `) [0 f$ ~/ NCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37: @* o {) X. c1 s3 b; s
Char, Arctic 5 0.09 0.10 0.05 0.05( Z* w+ |* O/ _+ I4 S+ ~* c
Clam (various species) 40 0.03 0.01 0 0.08' q* B" X, m8 A9 [: `, X2 f9 r) A- ]
Cockle, Greenland 1 0.05 0.05 0.05 0.058 d( _4 G2 U7 b3 r1 P( m
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
3 N9 u0 L' k6 s. cCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
8 X; B- e# W- R# [; Q7 U# B- nCrawfish 1 0.1 0.1 0.1 0.18 ^, B* N# Q7 w4 W" R0 d
Drum, Freshwater 2 0.22 0.22 0.03 0.4
; F4 z1 x/ y" M) G& O+ r. CEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
& Y& F d9 `/ k' G7 a" \. g' V) K# xEel (species not specified) 107 0.24 0.16 0.01 1.70
; y4 A2 g# ^1 Y. T4 TFlounder (various species) 22 0.06 0.06 0.03 0.129 o4 { b, P, S0 ?7 P9 {* P% G
Haddock 3 0.05 0.05 0.03 0.07 |
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