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Human Health Risk Assessment of Mercury in Fish March 20073 ]2 B* R7 X% h J
and Health Benefits of Fish Consumption
8 H8 E/ h* g8 g! lWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
! R# T. g0 r" \4 X1 S, O0 bpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical/ k x; g! g/ H N+ k
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
, n2 n$ D6 s) C: qproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury( v; `" A8 U9 r: V! A! i- S
level increasing with age of the fish. In turn, bio magnification along the food chain leads to6 M' ?6 A4 s9 B
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
3 B) f$ V& v# Morganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far+ A% G& z, i U, m+ u5 e" W
lesser extent than methyl mercury.' N# H* ]3 S6 e7 J/ C. X( j
APPENDIX I# Q/ a2 W' o5 c3 r9 H* [3 Y
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency+ x: g; ?6 B( l4 v4 d: l& n) l8 k8 v
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.) H* Q% G t0 I, O8 X. ~0 ?
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
u0 d. @ w9 y2 ?8 Z" V2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A6 c" J3 X2 D8 y
concentration of zero indicates that mercury was not detected above the analytical detection limit.
8 f' i! t! N0 y* a) t3 z) OTotal Mercury Concentration
* E2 r% D# [3 \% j7 j, B(ppm)
! o6 f% `: U, X5 _Species
T) A) f( o% ?' q, _" P, {No. of4 m& R& {# D& d/ \" h
samples3 c/ U2 |+ i7 I8 K" M" g" U q
(N) Mean Median Min Max
4 s. x4 A1 R _+ `( b( D4 BAmberjacks 3 0.17 0.14 0.11 0.27' Q+ c9 d9 x9 M8 ~8 M
Barracouta 1 0.06 0.06 0.06 0.06
- @1 u1 X, v( \; Z/ u' r3 H7 LBasa 5 0.02 0.02 0.02 0.024 ~" e9 }/ q5 c0 o+ Y
Bullhead, Brown 2 0.09 0.09 0.07 0.1" ?# v0 X0 U5 B9 R5 q. j
Capelin 4 0.02 0.02 0 0.05
+ C3 i4 N/ w# `$ FCarp 1 0.1 0.1 0.1 0.1+ @, M1 v5 S1 \% @ i! q
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.371 ]9 p+ i" F. W! K/ \6 W
Char, Arctic 5 0.09 0.10 0.05 0.05- W0 g9 y9 D; }
Clam (various species) 40 0.03 0.01 0 0.080 a: Z* a: O' R! l7 }* _
Cockle, Greenland 1 0.05 0.05 0.05 0.055 v% q( Q5 i7 e( d n
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28* u/ Q0 r$ Z4 _- J6 ~; L
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
m2 M) a2 }9 XCrawfish 1 0.1 0.1 0.1 0.1
6 g" F0 {/ _. l2 ~/ EDrum, Freshwater 2 0.22 0.22 0.03 0.4
5 A( O$ z/ Y9 R# ^8 IEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
' r6 f2 G7 U0 }' Y- Y& @! GEel (species not specified) 107 0.24 0.16 0.01 1.701 ?! {: ~% f) ~7 x5 O1 g% Q$ C
Flounder (various species) 22 0.06 0.06 0.03 0.12
7 Z* D. G5 D8 V2 h( oHaddock 3 0.05 0.05 0.03 0.07 |
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