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Human Health Risk Assessment of Mercury in Fish March 2007! h2 V" b6 ~1 a1 g. K/ M, W
and Health Benefits of Fish Consumption0 }, @7 c$ \. ~
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
; ~8 g. a7 Y0 Q! x) lpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
" y( t( {( H* J# z, L, ~) Fproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
6 g& H' e* ~# W4 c# g3 D2 kproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury* c/ Z" ^. _4 J. f5 h; K3 I
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
- r7 b' ^& d" ?# G- ?higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
, R/ K7 G0 o$ x/ ^& h2 i& Horganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
( B1 n) K/ j4 _: `1 ^lesser extent than methyl mercury.3 R/ W# f/ R5 w) T
APPENDIX I2 O. L4 u+ Z; n0 c
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency$ A: v4 I4 g0 K- J9 d2 a
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
. [6 r6 u" ]6 O& q9 ] n0 }Samples were collected at the importers= or at domestic processing plants during the periods April 1,0 m$ e4 ?1 H* w" N, O: A- m) U
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
! d- k; x9 n1 l7 o, n' v; Rconcentration of zero indicates that mercury was not detected above the analytical detection limit.3 O- X, w& Q4 {! \6 B1 Q: a
Total Mercury Concentration
7 I3 S8 o* W* w0 m0 ^0 @(ppm)6 O7 M0 ~4 {1 X4 s1 {' b' g
Species0 |3 y& m3 m( B9 ^7 U* e
No. of) }( f+ t, [' ]; m, Z U
samples
4 _5 a X# `9 Z8 ]* s$ e' t(N) Mean Median Min Max, R- V5 g2 Z: a' M* u; Z
Amberjacks 3 0.17 0.14 0.11 0.27. z# m/ l, F0 I" H
Barracouta 1 0.06 0.06 0.06 0.066 Q4 c% J' Z7 x
Basa 5 0.02 0.02 0.02 0.02
7 D8 Z! r \8 h7 v, Z6 }& [Bullhead, Brown 2 0.09 0.09 0.07 0.11 s3 q k4 d% a ]
Capelin 4 0.02 0.02 0 0.05' I, ^4 x4 [# c3 x: o9 U
Carp 1 0.1 0.1 0.1 0.1
+ U! L+ w# @8 |7 [1 C9 t1 A }Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37/ Q$ p$ D L% J1 i+ R" {0 ^, k' d
Char, Arctic 5 0.09 0.10 0.05 0.05
$ Y' K+ o5 O8 B6 m2 \7 F5 V3 pClam (various species) 40 0.03 0.01 0 0.08/ e. y* w3 A% }8 v( h/ a* H
Cockle, Greenland 1 0.05 0.05 0.05 0.05
, m, n6 J/ B: f3 cCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28/ g6 p3 b8 o6 H6 Y5 p4 I0 B
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
: B& ~! Q, m" i+ b5 s. YCrawfish 1 0.1 0.1 0.1 0.1
6 y# w4 d0 f2 v* [+ ~Drum, Freshwater 2 0.22 0.22 0.03 0.4- b( j2 y6 ]% T7 n
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.768 O8 f& @- `7 b. y- \
Eel (species not specified) 107 0.24 0.16 0.01 1.70/ C! q- \, r5 J" ?9 U$ d
Flounder (various species) 22 0.06 0.06 0.03 0.12
+ N/ s5 j; ]) J+ |$ yHaddock 3 0.05 0.05 0.03 0.07 |
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