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Human Health Risk Assessment of Mercury in Fish March 2007
! ?$ ?0 i) D$ `; ~/ l, W$ Hand Health Benefits of Fish Consumption( |+ I$ w0 v1 F8 i! l( ?9 c
With respect to the types of mercury found in fish, both inorganic and organic mercury may be3 `% J: c: f# r J5 ?
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical1 z Y/ I8 g* _
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
, `" S, u" h( Yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
- y k9 E% N8 C# S( l# ^. z- Q) Elevel increasing with age of the fish. In turn, bio magnification along the food chain leads to5 @$ j" _( h8 a# A% M8 M
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
9 e8 R9 Z# b% I. S/ e- worganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far' l- g3 |; K7 s. z+ @
lesser extent than methyl mercury.5 O2 A. B0 ^, m8 Z7 `
APPENDIX I
( G2 D/ r2 j6 i0 Y' N3 B I6 ySummary data for those samples of fish that were found by the Canadian Food Inspection Agency, {4 L2 d3 w( Z8 G- U2 D
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
# X4 l% a: h: ^Samples were collected at the importers= or at domestic processing plants during the periods April 1,% X) P8 D2 p( n2 u0 h
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
& ^" n9 }3 J# D p5 e( yconcentration of zero indicates that mercury was not detected above the analytical detection limit." ~/ [' C7 c0 L. j! w' ]5 o+ A- |
Total Mercury Concentration7 F) W# W9 L2 ?% j& }& [
(ppm)
7 r3 S6 b K1 d, G+ g! a9 ^) J7 @8 YSpecies: }6 K- \$ f, G+ ^& O+ H2 p! I
No. of8 G$ u/ _* @+ q
samples
: s2 J7 k. J, V% n(N) Mean Median Min Max4 e X/ z q. J# F
Amberjacks 3 0.17 0.14 0.11 0.27
! f0 q1 L2 C ?. {, t9 {- q4 _Barracouta 1 0.06 0.06 0.06 0.06, H& P! O2 ?- I* G' J1 t
Basa 5 0.02 0.02 0.02 0.02# K M9 O$ s+ T. q s
Bullhead, Brown 2 0.09 0.09 0.07 0.1
" i* R8 u4 I3 R8 RCapelin 4 0.02 0.02 0 0.053 I% H3 ^+ L5 l, y8 S1 ]
Carp 1 0.1 0.1 0.1 0.1+ H' G! Q# i! _4 O
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37+ M c# a# O5 i* t" Z9 U
Char, Arctic 5 0.09 0.10 0.05 0.05& {# h; C6 `6 u0 E6 a( b+ K
Clam (various species) 40 0.03 0.01 0 0.08
7 M9 L+ Q+ t" |: `1 S7 Q+ }Cockle, Greenland 1 0.05 0.05 0.05 0.05
3 J4 P/ z3 h' dCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28* W4 \- |6 y- o, k) }" \# p/ j t, N
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
' m! t2 |' F" ` D! v: V/ G/ |8 U1 ~Crawfish 1 0.1 0.1 0.1 0.1
4 n6 d& Y+ S0 o m8 I4 JDrum, Freshwater 2 0.22 0.22 0.03 0.4
. Q; U1 w( n6 b" @, X$ j- j% fEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
5 P3 j% V; m' q. g/ R" CEel (species not specified) 107 0.24 0.16 0.01 1.70$ h d8 {0 A z) j/ @6 o
Flounder (various species) 22 0.06 0.06 0.03 0.12( z. ? U- L2 }2 C: I
Haddock 3 0.05 0.05 0.03 0.07 |
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