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Human Health Risk Assessment of Mercury in Fish March 2007" \- v% j2 d: T+ v
and Health Benefits of Fish Consumption
0 `1 a$ a3 c2 m+ sWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
+ m% l7 B1 ^: O2 C1 s- v% X2 n$ _3 npresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical" x k7 `* t6 Q9 m S" P6 F6 c
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
; ]8 Z+ k$ Z" M9 xproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury; ?9 f4 j/ S" l) W
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
) X, W8 S0 H( j$ ^higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other. }+ u6 t) d4 Q9 P' }+ z y! F
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
: F4 a, s/ b/ d* dlesser extent than methyl mercury.3 K3 U) }, |4 a2 g# D+ i9 |
APPENDIX I; s M. u$ M7 j0 |% c
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency* U; z6 i5 e6 e' |. Y8 ^, W2 |, J& W5 X
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury./ Z# r% d' O! v/ |
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
- v$ ]0 V/ s. C: n2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
) H0 [0 {+ Q6 w# t2 j+ uconcentration of zero indicates that mercury was not detected above the analytical detection limit.+ ~" T, w* d% c5 x M! u
Total Mercury Concentration
/ h i3 K7 a. C7 [" f(ppm), e0 Z) [* H1 n6 p
Species
1 o. e% b8 h+ a) F1 d! i' W- kNo. of
" m. I" i, z& e7 M/ Z7 T1 S. T0 Ssamples. u" o/ Q: d' `' f2 }
(N) Mean Median Min Max" ^9 n# l% K2 K! x
Amberjacks 3 0.17 0.14 0.11 0.278 S* H ~% N! A! M, R5 a" H. ] c
Barracouta 1 0.06 0.06 0.06 0.06
: v2 h2 e! b7 Z0 vBasa 5 0.02 0.02 0.02 0.02$ I$ o3 v% w$ r- }" a% r
Bullhead, Brown 2 0.09 0.09 0.07 0.1# F3 G9 O% z0 M" G( S" ?3 V$ {
Capelin 4 0.02 0.02 0 0.05
, B0 ?) G, ] L/ f. G6 HCarp 1 0.1 0.1 0.1 0.1( G+ } T1 \/ b. q8 b
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
# F$ ]! N4 B% q) p0 mChar, Arctic 5 0.09 0.10 0.05 0.05
7 U- X, O" R8 ?; d. Z! [0 ~" EClam (various species) 40 0.03 0.01 0 0.08
( @5 u3 |2 {( wCockle, Greenland 1 0.05 0.05 0.05 0.05; k, |3 P! r, R, ?2 M4 L+ h8 @. z% |
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
! F0 n3 @' e) e8 o+ kCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
O7 H7 c8 D3 R3 VCrawfish 1 0.1 0.1 0.1 0.1
- e* _: j# x8 u- B- D3 K% LDrum, Freshwater 2 0.22 0.22 0.03 0.47 Y' W. O1 o0 u( f9 D# m3 g8 X
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
% i0 x* U& N6 nEel (species not specified) 107 0.24 0.16 0.01 1.70
% c) l2 E! d: A6 s6 y/ L+ Z! u( T5 VFlounder (various species) 22 0.06 0.06 0.03 0.12
! ?" F5 G1 [3 @Haddock 3 0.05 0.05 0.03 0.07 |
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