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<br />00175'J
<br />
<br />27
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<br />Snoil ,1/1",,,1,,,,,'<'." Estim~t~"Il M'ail n"mocn lIa",", "ot chnn~cd sisnitkanll>' since 1<l'JK,
<br />but numhcrs ha.", ~ho\,n n decline I" a 'alucof4147 snail. in ^l'riI2004, Curiously. while
<br />hahilal has in,:rcasc<.l. 'Mil numhcrs have nol IHld a wrrcl"lcd incrca <;c. The lack ofincrcasc in
<br />
<br />E!ltlrT\ilted snail nuniJer!l 1998.2004
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<br />i..ptJngj
<br />L.~I~ J
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<br />>00,
<br />3745
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<br />20032004
<br />676714147
<br />la400.
<br />,.
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<br />_.nailnumhc1'!\may hca'S<lCilllcd ",illlsoil moi'lurc and shins in planl sf'\'c;c.composil i.mrmh<'r
<br />than Ihe amm,nl ufhahilal availahk The Ili",h",!;c fnlm the 'pring al Va",)'s I'uradi'<\: has
<br />dcdincd sinc'c 2tlOl.lhcal11oUnIOfwalcn:rc" rnund "ilhinlhchl ,hilalh".hccnm<:rcd\KCd,nnd
<br />highomshccphavchcgulIlnhahilunllyvi,ill""lrnragcno('are:t'''I"''liI""(,,,'d~<,)allhe
<br />springs. Thew factors in wmhinaliun lOa> be aITccCing snail numl>l'rs rccoNcd since 2001 {see
<br />ligurc al><'~cl.
<br />
<br />A'llIlIl.c l~c'''"rec,
<br />Aqunlic ""Slluree, cuntinue Co lIndergo review ,,(melhodolugies and hiscmie dala, New
<br />sampling mctho,hare being incorpordCed inCo munitoring Ihe spun fisher>'. mni\'e lish
<br />eomnHlIlicics,r""d I>nse, and wnlerqualilym"nitoring. l'roloenlrevicwIMncls\",'rchcltlti>rlhc
<br />wacerqllalityprogram(KlIaneec"I,,2001I,thcJ.\~sl'crrylrullllishery(('lIlverel nl.. 21100) and
<br />lI,r the '''I".uk progmm (HruMord el aI., 2(01), ",hich inchl,les th... main,tem Ii_her\' downstream
<br />ufl.ecshrry,nndlhea4\1:1tier""dl>:lSeprogrnmalll'yslem.wi,lepcr,f'><"'Ci\'e,
<br />R<<nmmen<latioM maJc 1\,r lhe native anJ nnn.n;uive tishel')'l'mgram~ have included incre..sing
<br />"mdonl sampling elTorts,_,Irt:nllthcningclTuns a'''>eialed with inl egralinnaerossdiscil'lines"nd
<br />developing mndehng cll\,rls_ A" ell.."'li\'e mark-re,'uplure p"'gram inlhc l.eK and dilTercnt
<br />stock ns"'''mcnt modcls forns",ssing the SlalllS and trend_, "flhc hum pl>aekchuhhuvcbccn
<br />dcvdnpcdfmmlhisre\'icwpf<>Cc,",
<br />
<br />(,("MKCFY20061","".IW",kl'l.n(l)Uflhh"uryCS.l00.1)
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