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Human Health Risk Assessment of Mercury in Fish March 2007
% Z* U7 {- _) [ x$ B/ Band Health Benefits of Fish Consumption" u# ]3 | b Y8 X/ {4 R
With respect to the types of mercury found in fish, both inorganic and organic mercury may be9 {1 s- Q& b0 C$ L9 M; d
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
& E) Y3 T4 i2 ~+ C) Y+ z, Q( j+ Nproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
7 B4 r s# m0 n: n- ?proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
4 e9 G+ }# C& N8 l' {) ]2 x* S) O& slevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
" O& i8 Z$ O9 w6 |& z& Fhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other x' K5 j: S0 [. [" I3 F0 r
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
2 a. {- ~% Q$ V+ Ulesser extent than methyl mercury.
9 i: [; m+ h' {5 }4 e& d- JAPPENDIX I; e0 }- R0 y+ r6 |2 W
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
D3 h G& X- O4 |: L5 A4 f* L5 N(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury. @& W9 B, A3 K( G9 R8 R
Samples were collected at the importers= or at domestic processing plants during the periods April 1,( w$ Z- F, q% n; e3 s- U) X' h& h
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! n# Y2 ?# A3 R1 r! m+ M Bconcentration of zero indicates that mercury was not detected above the analytical detection limit.
4 W6 w ^+ L1 C7 h. U5 ^Total Mercury Concentration, W. f2 J- Q3 j
(ppm)
9 X5 t1 q' g& @1 F$ N. e1 OSpecies7 q a( ]8 R* \4 T" m [
No. of1 Y$ O& v, R) ]/ G: b( o9 ? O
samples
9 f' h- X7 @2 ]" j(N) Mean Median Min Max
$ ~# @# h" F& Z" A! U2 ^& ]9 JAmberjacks 3 0.17 0.14 0.11 0.27
6 a+ z) |" n! q* rBarracouta 1 0.06 0.06 0.06 0.06$ H% Z4 C+ K5 t9 E6 ^
Basa 5 0.02 0.02 0.02 0.02
7 [7 _! T, s3 R2 K6 j, b4 Q+ bBullhead, Brown 2 0.09 0.09 0.07 0.1- z" ?7 @& T% [5 {! ~% O
Capelin 4 0.02 0.02 0 0.05 c* \, n! J1 a2 s+ c {
Carp 1 0.1 0.1 0.1 0.1
# _0 Z3 ^/ g2 B MCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
, I# M8 h2 G' U0 KChar, Arctic 5 0.09 0.10 0.05 0.05) r! @$ ~+ R9 l: h1 w. R4 o
Clam (various species) 40 0.03 0.01 0 0.08# Q' B6 S, V; f/ o u
Cockle, Greenland 1 0.05 0.05 0.05 0.05
( T K2 ?, \% ?- `% W4 _Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
' V0 _; X7 V) _6 b( {Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
: V3 F6 y* J; k( q# T, YCrawfish 1 0.1 0.1 0.1 0.12 B8 A0 `& f' A A }: S6 ~
Drum, Freshwater 2 0.22 0.22 0.03 0.47 e8 ^5 Z9 S3 L8 F1 ~
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76: |, L* Y$ a# j% V2 B
Eel (species not specified) 107 0.24 0.16 0.01 1.70
. _2 R0 L- L! C7 G, I$ FFlounder (various species) 22 0.06 0.06 0.03 0.12
' R9 u; C. r5 UHaddock 3 0.05 0.05 0.03 0.07 |
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