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Human Health Risk Assessment of Mercury in Fish March 2007
6 Z# N. ^4 N- l. x d t9 }1 Yand Health Benefits of Fish Consumption
7 V5 |% n: i5 }( V& y& Z, u8 Y! qWith respect to the types of mercury found in fish, both inorganic and organic mercury may be9 v$ W( z p/ I# T# {+ |+ _
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical$ O* T: t) y3 q' V x5 j3 l4 D) c
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the5 L+ M, q- R; `8 G& h
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
( e2 R& {( q. m* ^level increasing with age of the fish. In turn, bio magnification along the food chain leads to
$ u! |4 e* R2 z+ M7 G, n# ahigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
( l, s/ d: V! t" ~$ l, m% jorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
D$ }7 @8 Y9 }2 j. b6 R% xlesser extent than methyl mercury.
: l, B$ m' o3 _( qAPPENDIX I
% L) H5 ~: z' w: vSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ I& l0 W( I9 } Q+ ?* e" d9 y(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
6 Q* c- R- s. U9 `& USamples were collected at the importers= or at domestic processing plants during the periods April 1,
C- |/ F* l9 F4 _( H u2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
# J+ F0 e$ N, s4 o4 |concentration of zero indicates that mercury was not detected above the analytical detection limit." R4 ~6 P" S! s3 r8 {' O- J0 `) E
Total Mercury Concentration
4 @! B2 T7 e" M( b0 S: ?* F(ppm)- K6 ^" P/ |1 @! d1 `# E
Species
9 T. R+ M" i, @9 r0 xNo. of
2 @+ n& u; F- f6 ]samples
0 \+ X5 a7 N3 M5 v/ K @(N) Mean Median Min Max
7 m# `- k7 t0 I M: bAmberjacks 3 0.17 0.14 0.11 0.27; L, R( x7 v$ h$ b! z- n
Barracouta 1 0.06 0.06 0.06 0.06
) u5 o( G i0 x' Y$ ?: |+ m ABasa 5 0.02 0.02 0.02 0.02
* ^8 o( G O# ]6 O* g+ p: sBullhead, Brown 2 0.09 0.09 0.07 0.1% f7 s. U6 R! |# k& t. @
Capelin 4 0.02 0.02 0 0.05
6 R; d" y0 N+ RCarp 1 0.1 0.1 0.1 0.16 N6 M# q6 y0 L$ y9 e
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
" b* h+ g7 J6 _2 h. n1 _+ BChar, Arctic 5 0.09 0.10 0.05 0.056 B" j; C4 Z1 R) r
Clam (various species) 40 0.03 0.01 0 0.08) N' N! e2 Q2 n8 s, ^$ [) O
Cockle, Greenland 1 0.05 0.05 0.05 0.05
$ \$ Q% c9 {9 m+ w! m' s- {/ xCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.283 L( z- a% V/ R3 l
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
! K0 V$ u: a: d; S% N: UCrawfish 1 0.1 0.1 0.1 0.1/ J3 J3 u1 L9 L4 h: L
Drum, Freshwater 2 0.22 0.22 0.03 0.4
" Z2 W% @1 L- j WEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76" Z4 R e6 b# N
Eel (species not specified) 107 0.24 0.16 0.01 1.70
- m2 y# R! |- RFlounder (various species) 22 0.06 0.06 0.03 0.12
4 e' u3 X2 l) N+ z5 l" `, D( |Haddock 3 0.05 0.05 0.03 0.07 |
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