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Human Health Risk Assessment of Mercury in Fish March 2007
' C& `+ V" }# W5 Land Health Benefits of Fish Consumption
6 p& ^; v* o$ V; P% i+ g! c7 fWith respect to the types of mercury found in fish, both inorganic and organic mercury may be$ e! Z' D E2 O9 [: r/ A
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
: n/ L+ `/ w8 \) S% y) N. @properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
/ ]( B { J6 f, @# aproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
7 O* k! _3 \+ q6 Q; U Slevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
& f* [; @5 Q, h+ i, ?! b% y( c$ jhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other) a( l" i5 i+ G, w A2 ~
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
$ @6 x" `& b9 o% clesser extent than methyl mercury.
+ l E n! X$ @ `5 BAPPENDIX I
% { `, ]# F( W* w5 O7 ESummary data for those samples of fish that were found by the Canadian Food Inspection Agency
8 P) b, V2 o; I" j(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.* D, ?2 _5 Z' }5 N9 m4 `
Samples were collected at the importers= or at domestic processing plants during the periods April 1,, V' h" ]; _. Y( P" _! q
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A# V) W+ z2 U- W# Q/ u( ~! x9 s( Q
concentration of zero indicates that mercury was not detected above the analytical detection limit.
' |8 l$ B' N z, z0 xTotal Mercury Concentration
6 c2 J0 f) U; z6 L4 M(ppm)
. n/ r. e( V& MSpecies# k5 R1 {' X- e% K* Y
No. of6 K* m# j, T7 R% U4 s* a- s x! f
samples
# E% H/ v4 P" f" H5 v) _(N) Mean Median Min Max3 s, x$ {% T. n# Z
Amberjacks 3 0.17 0.14 0.11 0.27
, r t" Y- Q3 [, l2 P) s3 ^, JBarracouta 1 0.06 0.06 0.06 0.06
! j! a) N3 }: K% U" @. ]& ?9 p! rBasa 5 0.02 0.02 0.02 0.02
$ J% @/ ^8 W" k6 H; C' y9 uBullhead, Brown 2 0.09 0.09 0.07 0.1: g+ f3 ]$ v% G) N/ ?! F' _6 n% P
Capelin 4 0.02 0.02 0 0.05
+ r9 R- h* \ D/ FCarp 1 0.1 0.1 0.1 0.1
" W- V4 [# |& Y8 o: Y9 K$ I4 T& ]Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.374 s' w0 A \, u2 Y; X
Char, Arctic 5 0.09 0.10 0.05 0.05
3 \4 N0 _! D, c# u, N$ T6 T6 jClam (various species) 40 0.03 0.01 0 0.08! e0 G! p: t9 ~+ m
Cockle, Greenland 1 0.05 0.05 0.05 0.05
# A+ H. L5 l( vCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28" v0 L# }, d2 w! Z5 L
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
+ F, i" C7 K2 l9 tCrawfish 1 0.1 0.1 0.1 0.1
* p& L |- P8 ^7 D; P! @6 zDrum, Freshwater 2 0.22 0.22 0.03 0.4% t* T0 P* K) ~
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
1 @$ w1 {* l! m3 @Eel (species not specified) 107 0.24 0.16 0.01 1.70' i/ |; h* w8 o- D+ Q
Flounder (various species) 22 0.06 0.06 0.03 0.12
5 |) `2 n9 b- u1 a1 LHaddock 3 0.05 0.05 0.03 0.07 |
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