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Human Health Risk Assessment of Mercury in Fish March 20074 h; H. [" q R7 C8 ^& D! d0 N
and Health Benefits of Fish Consumption
K; S% V0 u7 s: {% O2 d: pWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
9 K) L8 w& |" B! ^# H2 Xpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
: C5 t- B' J+ ~7 ^8 hproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the, ?! Y& |: ]% j9 J- d) [6 _; d
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury3 Q3 R& a1 G! p& ^0 R- e x% z# A/ g
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
* E* J$ h0 O# [4 k- Ihigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other' _. [7 b) \: d0 N- s" j
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far8 E! c8 C5 ^/ V2 h
lesser extent than methyl mercury.& d) z" {4 ~7 q
APPENDIX I x' u1 ^% j' E; x0 I$ U
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
5 C; H0 ]) e) t4 b6 R3 S' k& ~- r+ Y2 R(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.8 N/ ?' w" R: Y4 b5 E
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
* H& D: p) t1 a- c3 s7 P' x( f B2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A0 X1 s5 T8 f5 g i ` q& e! {. W
concentration of zero indicates that mercury was not detected above the analytical detection limit.
4 o6 A- f. C% ~# y* z; X; ATotal Mercury Concentration
. y; C. u! w O2 N- O5 n(ppm)
$ M2 z. Q: c/ x oSpecies
9 }. V% b! \1 t0 r: a2 SNo. of# i. p: q7 B' q1 E5 V4 F+ B8 `# z
samples
z$ U) v+ x7 g: B4 f! r(N) Mean Median Min Max
8 H3 B: N: z9 ], l, }3 Z ]Amberjacks 3 0.17 0.14 0.11 0.27
( }: H% z/ R9 Y; J, cBarracouta 1 0.06 0.06 0.06 0.06
" v1 ~ f# {: f5 F8 f fBasa 5 0.02 0.02 0.02 0.027 o7 ?- W& Z$ F9 M% w9 w4 }3 e
Bullhead, Brown 2 0.09 0.09 0.07 0.1
9 m5 d: `8 z, g" ~5 y1 i2 D4 HCapelin 4 0.02 0.02 0 0.05: V+ ~; F u4 D+ g1 s! D
Carp 1 0.1 0.1 0.1 0.1" \# ?, f8 ]& h7 E P
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37" H/ L8 B" H- _8 z! a. W
Char, Arctic 5 0.09 0.10 0.05 0.05+ d9 U1 {' k6 L' _5 E- p& b) d. E
Clam (various species) 40 0.03 0.01 0 0.082 u' \ E$ h0 d6 r
Cockle, Greenland 1 0.05 0.05 0.05 0.05
/ z: c! `( {. X6 T2 u5 oCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28+ b4 y6 h7 N G# C$ U1 Z" X( @8 s$ P
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37! m0 {4 O0 \+ ^' j. y4 R: [
Crawfish 1 0.1 0.1 0.1 0.1- A, ?# b, j% b1 |3 P/ t7 i
Drum, Freshwater 2 0.22 0.22 0.03 0.4: H" e* j' L v% N: D" C' ]
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.769 d. P* z7 F: J( g
Eel (species not specified) 107 0.24 0.16 0.01 1.702 A$ `* c" C& w; W" F4 _! n& K$ s
Flounder (various species) 22 0.06 0.06 0.03 0.12
8 E1 {" h; X% i, @Haddock 3 0.05 0.05 0.03 0.07 |
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