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Human Health Risk Assessment of Mercury in Fish March 20076 F9 M6 M2 N6 c! A/ M* L! Q
and Health Benefits of Fish Consumption
1 T" {9 F# ]8 l# }# @. dWith respect to the types of mercury found in fish, both inorganic and organic mercury may be# {. D# P1 z0 l/ P1 y+ P
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
* r- t0 l- @5 ^1 Nproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
+ a+ O6 X+ |3 g c+ Tproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
+ y; f3 `, u& b& Xlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
$ T( L5 l' H2 G/ ^7 Khigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other) t u! W" L2 S# A7 [4 H
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far) j; G, K. m3 E5 @3 p$ r' _6 r, i
lesser extent than methyl mercury.
$ N Z+ ~$ x) vAPPENDIX I
9 Z+ }7 l2 l2 y, dSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
& p* V0 {& w: p9 A* E(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.$ ^* `( [; L5 M, @5 @
Samples were collected at the importers= or at domestic processing plants during the periods April 1,- W V& l! k& I
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A" x k7 w3 _; |$ T. r" X" t
concentration of zero indicates that mercury was not detected above the analytical detection limit.3 v F/ z9 j( K% u* [
Total Mercury Concentration
" c5 n. W# d, g1 l0 }. D(ppm) l" x# ^2 S/ U% t0 p
Species5 {3 C9 U! @2 \" p" I# u Z
No. of
r8 I2 h4 @" P1 C* K ^- E$ Asamples J* a* |6 J% w2 u# ]- Z
(N) Mean Median Min Max
- @6 D* ? m) t7 |Amberjacks 3 0.17 0.14 0.11 0.279 D9 Y) q# G1 ]4 z# ^
Barracouta 1 0.06 0.06 0.06 0.06# M; [0 H" ]+ o- ~# A5 J; I0 B
Basa 5 0.02 0.02 0.02 0.023 J* ~3 E9 n% a! d/ P4 M9 Q: X: y% l9 s
Bullhead, Brown 2 0.09 0.09 0.07 0.1
" i$ o) O# U6 s, r. x3 hCapelin 4 0.02 0.02 0 0.05& w& Z! g0 ~4 z* ]( ~, e: G
Carp 1 0.1 0.1 0.1 0.1
1 [5 X- o9 M/ _$ s4 O2 bCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
H, K% d4 k. c& s8 f! m5 rChar, Arctic 5 0.09 0.10 0.05 0.05
: ~0 z! H: a6 P m" R, s+ Y3 H+ IClam (various species) 40 0.03 0.01 0 0.08
; ^5 I+ d- K, t! fCockle, Greenland 1 0.05 0.05 0.05 0.05
2 P4 D1 ?$ G$ JCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28- ~9 K0 Z$ i* u6 G; j, d
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37# w3 ]6 ^6 f1 Q$ D5 R& W% f# y! T
Crawfish 1 0.1 0.1 0.1 0.18 d2 Q( F4 Z1 C6 }# A2 m. |
Drum, Freshwater 2 0.22 0.22 0.03 0.4
8 y$ S' K v0 e3 t/ KEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
, F2 g+ E/ p! sEel (species not specified) 107 0.24 0.16 0.01 1.70! n. m$ `: Q% |+ j% z2 z6 b1 A/ C
Flounder (various species) 22 0.06 0.06 0.03 0.12: s( O* l5 ~# T4 o1 u
Haddock 3 0.05 0.05 0.03 0.07 |
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