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Human Health Risk Assessment of Mercury in Fish March 2007( V0 Y; x. _. p
and Health Benefits of Fish Consumption
/ F+ z* n, C' @With respect to the types of mercury found in fish, both inorganic and organic mercury may be3 N& d m4 G) u2 z2 t6 b8 S: ^+ u' t0 R
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
7 z: l' e6 R; |' @! Bproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the, Z; [9 n; c% l' t* j. D
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury& ^9 O2 F4 t1 ~9 }2 {2 P M7 @; q
level increasing with age of the fish. In turn, bio magnification along the food chain leads to5 d# ]9 K) M4 L. G8 ]
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other4 P7 r) X; n7 L( J; i; d& ]
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far. w9 P! i- y1 A- w9 U" H
lesser extent than methyl mercury.
' y0 t n+ G P5 ^) nAPPENDIX I
; _# O/ _& Y* w- QSummary data for those samples of fish that were found by the Canadian Food Inspection Agency! n3 K+ n+ I8 ~' u) m
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.- K; T. \6 p" Q9 e
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
, }5 O$ G" B7 E1 E. w2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A3 @- f! U5 m. P/ O. H
concentration of zero indicates that mercury was not detected above the analytical detection limit.
. }, `* x/ N# N Q3 I, P' MTotal Mercury Concentration
+ j* j% {; s- k- ^9 ?; b0 W0 u(ppm) {& g1 h9 u& L, \8 T8 d8 X
Species0 `4 v. M7 n* u; S0 F
No. of% C7 S& h; ~+ O; @5 q3 [
samples
: v! m. t5 M: {% ]" e# Y(N) Mean Median Min Max i, M2 `$ a; K( o
Amberjacks 3 0.17 0.14 0.11 0.27+ l/ _" i* G0 m/ L, K
Barracouta 1 0.06 0.06 0.06 0.06! G& `8 L- d P) n: G2 ~; N7 J
Basa 5 0.02 0.02 0.02 0.029 H. m# ^* s+ M3 q% _$ S; J
Bullhead, Brown 2 0.09 0.09 0.07 0.1
8 z- H9 @( I% j+ mCapelin 4 0.02 0.02 0 0.05
5 i: R0 N- V: a0 O, mCarp 1 0.1 0.1 0.1 0.1; F% u/ h9 v$ o; L* E- }
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.376 \( N z( e q& v" u4 |
Char, Arctic 5 0.09 0.10 0.05 0.05
" {( ~7 f4 N9 J. h) YClam (various species) 40 0.03 0.01 0 0.08
5 b: t, c9 d W6 C8 j7 kCockle, Greenland 1 0.05 0.05 0.05 0.05" X' Z, Q" [& n0 A* N9 K" d4 T& u
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28% y/ o: E2 D0 V* a/ z
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.374 K/ G: H6 b6 u: n
Crawfish 1 0.1 0.1 0.1 0.12 _$ r. a. b! o! Q+ q# D. q
Drum, Freshwater 2 0.22 0.22 0.03 0.49 j0 f$ x! Z2 k* i/ c9 Y4 z
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
! I# |+ y- ^( w+ p, T: _Eel (species not specified) 107 0.24 0.16 0.01 1.70
1 j1 N' b( V: D! M4 l- ~Flounder (various species) 22 0.06 0.06 0.03 0.12/ N$ P/ A* o( o* @
Haddock 3 0.05 0.05 0.03 0.07 |
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