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Human Health Risk Assessment of Mercury in Fish March 2007* ?& Q# B0 Z1 G9 D* ?/ d; R
and Health Benefits of Fish Consumption. ]2 Z9 r5 C# M% V+ m
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
! U( s0 v; y4 dpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
) L0 K( @' G' U- q' vproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
9 |+ b! r/ K9 N: U, aproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury1 |4 ^+ B0 L% `/ g/ ?& \$ u! B
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
0 a# x0 N4 B1 G" ghigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
. Y3 a! m0 Z, I, ?+ D; @) A% `organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far5 u' a0 [ E; q: P! \
lesser extent than methyl mercury.7 u# @$ J! Y2 a
APPENDIX I2 e, l! [# f$ M$ Q5 I
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency' I$ `0 Z7 e \. j7 n4 f
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
* w+ r- Y! A/ S+ i% r! BSamples were collected at the importers= or at domestic processing plants during the periods April 1,1 v- }# Z: p) R
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A+ g, L% A/ L T8 M: C
concentration of zero indicates that mercury was not detected above the analytical detection limit.
# L. p7 r" k, W' z! {Total Mercury Concentration; p. Z( `3 d0 A5 b% ~
(ppm)
1 X, c5 ~2 R4 B! M3 bSpecies- f7 j K0 \9 o4 ?( C
No. of
- M$ k- z, s" p8 \5 Y3 gsamples6 t A, D6 U6 S$ R- C( B( |. N
(N) Mean Median Min Max
5 _+ s1 z" r# Z" l+ bAmberjacks 3 0.17 0.14 0.11 0.27
& V) o0 l; K+ H+ @2 R/ p3 ]/ P* s* \- dBarracouta 1 0.06 0.06 0.06 0.06
0 n% }) t2 K: a1 H8 A% M$ f0 BBasa 5 0.02 0.02 0.02 0.02
) }: [7 e+ j" P; TBullhead, Brown 2 0.09 0.09 0.07 0.1
5 z+ B8 m4 x3 p" k7 b3 f( w) d4 n0 ^Capelin 4 0.02 0.02 0 0.05
0 a0 y# y/ A3 Z/ kCarp 1 0.1 0.1 0.1 0.14 o: \2 @* o, c* I- l
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.378 f% X, O) G* e0 [: R1 b
Char, Arctic 5 0.09 0.10 0.05 0.05
: c# O1 t, L( V P& e% Z- MClam (various species) 40 0.03 0.01 0 0.08
3 W1 g) H3 w- E& {( v. f, \, F iCockle, Greenland 1 0.05 0.05 0.05 0.05
2 x/ e7 _( v- p. ], D+ U$ m% oCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
2 [ L+ T/ h9 h& N. nCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
" r) t/ ^9 V" [5 ~* MCrawfish 1 0.1 0.1 0.1 0.1
2 C7 T7 Z/ O# D) W6 H5 u2 d# B0 O8 SDrum, Freshwater 2 0.22 0.22 0.03 0.4
6 }" s, q5 k% A- p$ _+ v8 v# {7 pEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
( r8 B7 X8 U3 d2 m& `9 DEel (species not specified) 107 0.24 0.16 0.01 1.70
) T z% H! v5 f0 r0 h/ P: G9 jFlounder (various species) 22 0.06 0.06 0.03 0.12
8 H- z" D7 r/ j0 L: ~Haddock 3 0.05 0.05 0.03 0.07 |
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