A small collection of material consisting of scales and relevant information collected in 1964/5 from sea trout of the Argideen Rive in County Cork was examined and the results compared with those obtained in the years 1954/5

Went, A E J

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4 0 TALMWAHOCWTA AGCJS HAS@AIi(;M (Department of Agricul ture  and I"ishericbs) FISHERY LEAFTAET N0,54* SEA TROUT OF THE RIVER AWGIDEEM. Fisheries Division Dublin. 1973 Sez t ~ 0 u - t  of the 3i~re.r ;i~ci*g "- -*- 732- A. ,3 .J . 'qznt hbstr*t. i sm11 collection o f  n z t s r i z l  c ~ n s i ~ t i ~ g  of SC&BS and r e l e v a ~ t  ormation obtshied i n  1964/5 from s e a  t rout  of the hg i i l een  Rivar 2I-i Caul* Cork Eas exa.mk1e.i t h e  resul t s  ?:ith these obta ined  i;z the  gears 1?54/5. In a revie;? of tb9 ~11~2st i5at ions of I;ziah s e a  t rout  (:ient, 1952) a short  account lr!aS gi~@n of  the  Sea t r ou t  of ."she -i&,.iGee:l IY~voy, b a s 4  02 a sm3;ii w o m t  o f  nct2rial. fro01 the rod  czJcc;~2i: collected by j,t, C~la i le l  @ton Trmers of ? ! b ~ l + & ~ ? ~ e ~  CO, Cor!r, iil gs3;rs 1354 ~1,: 1455, .At the t im2 %IBre Was some su,yr;estioil that the r n z , t ~ r i ? ~ l  i3i:i:z~C zot have be61 fully reorese?nta-Live Vn&t thzre Y;LS s tenGe-lcy 2033 the L s r s a r  fisl.1 t o  have been selzcted. Ln 1?64 md In65 a furtl-t3r ::xzll colleci-icri of Colonel Trzvera, tosether ai-lh r3onlc se ts  of scales Pron sea trout saolts, As the naterihl covered h o  a?-ciitional seaso?^lo it -ras thou2ht ~ o ~ t k ~ ; - L ? i i e  examining it t c  see if t?iaze nere .~:ly 07ifVious ciZz:+:ss 20 the l i f e  h i s t o ~ r  of the ssa -kout of the  jegideen :?i.~er, 7 u r  cameni;nce the -1954/5 results have a l s o  bean given iri sans  of t h e  Tabl-?s, Li 1954/5;5 oz-ilg t r ro srnolt ages lfJers i d e ~ t i f i e d ,  naaely t:ze trvo &id three-gear smoL-t c l a s s e s ,  unlike 1$54/5 whsa a fev one-sear sm~l t s  aere identified (2;;1b1e 1). 131 1364/5 there ncre relztively more txvo-yez>r 02.d smolts fhal 31 1?54/5. both the t-,-:o aid tkme-yeczr smolt w;es ir 1964/55 there ricre more tjr-e 3 smlts tbail t p e  A sno l t s ,  as wai; the c-se in 1354/5. Iil l?64/5 tliere b r a s  a prc>ontersnce of f i ~ ~ i c c l r  (t sea :ro1q3) in  the catches ( ~ 2 b i e  i;), ~vheress ill 1954/5 fish ;;_? t l leir  sccoad 2ost  nigrstion ', smxnez ( I  + 8 3 ; ~  ;;re1qj :-re;:e cos,ao;:zr a1d p::eiioz,iz1ated in %MB fish szml~led, %-hick proja5ly due t o  so~ric? extent to selection of the 12~g l l r  (and o l d s r )  f i sh ,  as B ~ < ; c s ~ P ~  ~ PO?&J. JL1 tile p r e v i o ~ ~ s  s x ; m e r s  j.:i 1464/G5, 'zs i:~ 1?54/55, hsd only one s p a ~ n i r l . ~  or_ -their scsllcs. in the 1964/55 eatcliaa 3(50:$) AM s?am-ed first as ikx~ook ,  ~ ( 3 3 . 3 ~ 9  as 1 + sea grou:, fish, and one (16.7;;) as a 2+ Sea group f i s h ,  ZCS %vera ,3~  s i z e s  01. the  VX:~OUB q e  categorids wem calculated and the results a;-? ~ i v e n  in 'lzJ>ie 3. ;Is o? th2 p ~ c v i o u s  occaeion there ltas %ere ~u'as, as C:?JI 1'3s sesn, i n  196~+/65~ as izi 1954/5 j, co~lsid.zre.z~blo overla13 as be9::esn the ~~eig$-ts &id lengt l is  of f is11 b e l o n ~ i n . 2  t o  d i f f e r e n t  q e  Groxps, me largest maiden fish on  tilii; occsaiozn weFf;iriecl. 2-;;- l b . ,  meaoure2 15.5 b c h e s  %id w s ; ~  t&t:en 011 20 July 1964.. It had spent  -tii:ro years in ths r i j .~?~ baf ore <;oirq; to t h e  ses as a S E O ~ ~  =d t h e i ~  jrj-~t over tyro f u l l  ;.easa f-39di~r.; irz -t!i2 sea. I-Ls "tctsl %:+e Ixas, t h e r e f o r e ,  4.+ ge?zx. iz B e  scale:: of the m~ideil or mspz-ined fish aer2 used, i n  the n o z x ~ l  way, t o  dete~n:.j . i~e thi3 srow-th of -the fish, i , s ,  assurriing tilat "che kzo;.:th >. m2as? lengl;!?~ f o r  tile vaiou;; srnol-k c l a s s e s  z ~ d .  s ~ o l t  y y e s  ;%e  give^. in Table 4. Ln general t h e  f s s t e s t  groa.,-ki. - arnolts mig-j-atea f i r s - t  but tile The g~o:irth r r z k s  of %he t rro sno1.l; ty.;es %I tlle k.;o s m ~ l t  classes :>.,re f a i r l y  close t o  -those co lc ids fed  f r o 3  tile 1$.54/55 m t o r i a , l  (given i n  bracvet.i) the mexn ;::alt s izes  irr t h e  vairious sriiolt tyfr13et a i d  classes being as i"olic.,ts:- So-ol-'~ clsss T-KP~ A Pype it 2 7.2 (6.8) 7.4 (7.71 3 3.1 (7.3) 5*3 (5.3) The cstculat?d g r o ~ t h  rakes of the actual. smol t s  cantu~ed iil 7964 v7eX-3 53 follc,~?!s:- Snolt  cles; 'To, Lensth in i l chc s  at e ld  of At c ?&are - Pirst yea r  Szcolid y a w  Third yaar -These ;io~:tl~ m x e s  were gej;erall~ ~li~ylltiy l o ~ ~ r e r  calcalc;tad fron -tze ~t~min,;: fish in 1964/65 as i i~dicated in T ~ b l e  5, 312 3;LTerq:F: ~&1~~lat'i?d l eng ths  at ttie e;ld of t:le cirst  =z,l i , k t c r  of fish ret~u-ning j-11 their second post rnni.g~ztia:l s m e r  cere as follo; ,s:-  TJO-~JCL~ ~1x011; class :- 11 j jxtches TbZee-y2sr snol t  class: -- 12.0 Liches 1~x1 ~ L 2 O l t  ~1-266~3:- 11.5 kld?es Tne ~ v e 7 , " q  J l?i?~,P-1;2$ at tlie end of t1? first 3rd seco-ld sea wbitsrs 2t-1 fish re turn id, kl their -tilird ~ O S  t zi:;zcrk Lon 3t~1~,3l '  -.rere : - l iYr j - t  ~ 2 a  xinter lci17 jliches Secoad sea w i n t e ~  13.3 .inches ?"Re preseii-i; ixve sti;;a.tion i;;-lai; i~z,de e ; i~ . l i e r  (~;~e:lt, 1962 ) j~ldic,2,,tz~ thstge:ler:?Aljr $h7? .:IT!Q~''G sizes of Sea -i;rout in the jh:gid,ee~ Rj-~er yiere about in %lie f i dd l e  r a q e  for Irish rivers, whereas gro7,~th j";, i;!le sea 3332B9TCE Went? A32-31m 3,J. iTent. (1952) Irish sea "irout, re-vi3r.r of in~ea-LL,.;~~-Lio~~s t o  date. %i, ?roc, R, Ihxbliri 5oc. AILId .ToOIOI ypI  255 - 296. - %101t ~ 1 3 , s ~  Smol-t ty-pe Tot  ti1 - A B Tzl2le 2. Tbn d3'stribuJCioa (2s lercenta~!:?s . ., of all f i s h  ~ ~ ~ ~ i ~ e ~ ~ )  =q the various 2 . ~ 3  e;roIl?a (~ i&ures  for 1354/5 LT braclrets. ) First pos.t-~i-;;5.ration su~;ii:"r or fkmock (+) 75.0 (32.2) Second poct-mQ~ration s7~i~r3;_r3. (1 +) 15*3 (51.8) mi&. p o ~ . ~ - i ; ~ ~ p G i , - ~ i g ~  stx::zler (2+ )  3 *6 (6 a 2  Previous sp~i'1~;123rs ( ' ~ i t h  SNs) 3 .'I (6.8) Table 3 ,  A:JVP~TZ:~ .~. m i g h t  end l e~lg tn  iq d i f f ~ ] ~ e z t  qse c;zt;e;-ories, Age C~teg;:op~r .L Table 4. Ksm icn,ytl-Ls 1x1 L-hes st t h e  a3.l of each y e a r  of freshrater l i f e  the ~ d i f  aren-t a n o l t  classes. Slnolt class ------- L?;?c:th .---- at 2nd of I,.% - .- First y e w  Second p a ~  TYTYdu -re&? m x ~ a , t  ion "" *--- 2 3.0 5 .6 - 3 7 94- 3.0 5 -5 7.5 8 .lj Table 5. :.;~~il l~~:&lls in inches at the e-,d of e x h  of frcnh?iatcr life b the different s~io1.t classes  mi! s n o l t  tmm, %+pe A 4-.. I? a o l t  First Second Third - --- -Y----- --- .-- i:_ t --I__ First -_- Secol?d . . . _  CTMLY~ At -- clctss Year Iezr Year a- __. mi,zrat i on --- Yaar Y$?,r Year c ~ i ~ ~ ? " t  i a : ~  

Sea trout of the River Argideen

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Sea trout of the River Argideen

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