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Human Health Risk Assessment of Mercury in Fish March 2007
, r/ N8 J& f7 V" Band Health Benefits of Fish Consumption
* `+ ]- c3 ^* t4 o+ w6 [With respect to the types of mercury found in fish, both inorganic and organic mercury may be& L0 i6 w! o. _+ l4 v/ z
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
5 g1 s3 J* M% u2 b$ P! x/ Q) Xproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the3 g; X, y6 w1 Y( C
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
8 g1 |, L+ t9 l; v+ y# v" m2 r: mlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to9 S" I1 D1 T5 k3 `# ?3 N
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other) |4 a3 b8 E0 s' H) y- _
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far# d( a) k% w- y. R0 [2 ]) w
lesser extent than methyl mercury.
) ?, v$ d' I: Q" t0 ]$ H5 [APPENDIX I
, M8 ~0 T; s: s" Z, S# ^) y/ ^# m5 pSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
$ ~5 n( B$ v- `$ @7 u! R/ ^(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
t9 _, Z6 ]4 E0 p9 [Samples were collected at the importers= or at domestic processing plants during the periods April 1,3 N; J- ]$ `7 ?0 L
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! v4 _3 m" i3 V8 O, B% R8 }, cconcentration of zero indicates that mercury was not detected above the analytical detection limit.9 D: W" s/ R1 w8 w1 |
Total Mercury Concentration" @; y$ W! O& t1 m" U
(ppm)
2 \3 {8 @8 X8 F! |" q1 xSpecies
- l& y5 ?9 G" qNo. of) A# c; t: X; l) d/ u6 \- F
samples
. W) m/ \/ c+ s% u ~) h(N) Mean Median Min Max
( I& o0 I F: `+ WAmberjacks 3 0.17 0.14 0.11 0.27
; r# V' a8 p$ b! x& h& ~* f0 H dBarracouta 1 0.06 0.06 0.06 0.06: q$ ], _: R" ~9 Y2 P" k# _
Basa 5 0.02 0.02 0.02 0.02, r. N9 K7 S$ t1 V) K
Bullhead, Brown 2 0.09 0.09 0.07 0.1
, J+ d& X n; D$ ECapelin 4 0.02 0.02 0 0.05
0 l3 Z% h' E' [8 tCarp 1 0.1 0.1 0.1 0.1* y1 b# d, A. l8 S W
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
! K' [$ H3 _* m5 z, G; L& [( yChar, Arctic 5 0.09 0.10 0.05 0.05! _0 f0 h8 K: j& ^1 v
Clam (various species) 40 0.03 0.01 0 0.08
) P( w- ?2 E/ B8 |Cockle, Greenland 1 0.05 0.05 0.05 0.05$ G- |7 Q4 \3 G6 L' ]: I
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
2 C* ?8 e3 ^7 r% Y# Z) B$ o2 E# ICrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.375 f: t$ Y5 U% w* Y8 G2 v5 p% x
Crawfish 1 0.1 0.1 0.1 0.1
' a8 F6 V' K) h- S$ a, y- E& CDrum, Freshwater 2 0.22 0.22 0.03 0.49 m' y+ S: C8 j
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
' K/ Y% i5 |2 p) w; nEel (species not specified) 107 0.24 0.16 0.01 1.70# k, q& W. G' G# Z1 O! H
Flounder (various species) 22 0.06 0.06 0.03 0.12
- ?( C: x9 X5 T) n- F( T X/ HHaddock 3 0.05 0.05 0.03 0.07 |
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