Rannsóknir

Frá árinu 2001 hefur bleikju stöðugt verið að fækka í Eyjafjarðará.veiditolur_eyjafjordur_2012 Á sama tíma hefur urriða  fjölgað nokkuð. veiditolur_urridi_eyjafjordur_2012 Stangveiðimenn og landeigendur höfðu áhyggjur af þessu og var árið 2007 ákveðið að takmarka mjög veiðar á bleikju í ánni.  Veiðar í hliðarám voru bannaðar, veiðitími styttur á efri svæðum og kvóti settur á bleikju.  Eyjafjarðará er því með fyrstu ám á Íslandi sem kvótasetja bleikju.  Litlar sem engar rannsóknir hafa verið gerðar á áhrifum veiða&sleppa á bleikju.   Því var ákveðið að hrinda slíkri rannsókn í gang við Eyjafjarðará.   Í stuttu máli gengur hún út á að nokkrir veiðimenn á svæðinu eru vopnaðir merkibyssum og merkja allan fisk sem þeir sleppa.  Niðurstaðan er svo hversu mikið af fiski endurveiðist.   Treyst er á að stangveiðimenn skili inn upplýsingum um merkta fiska sem þeir veiða.   Ýmist með þvi að skrá í veiðibækur,  hafa beint samband við merkingamann, hafa samband við Fiskistofu eða skilað í hreisturpoka.  Mest hefur verið skráð í veiðibækur.   Athygli vakti að nokkrir af aflahæstu veiðimönnunum í Eyjafjarðará skráðu ekki einn einasta endurveiddan merktan fisk meðan aðrir, sem jafnvel veiddu færri fiska, skiluðu upplýsingum um nokkra endurveidda merkta fiska.  Þetta var raunin ekki bara eitt veiðitímabil – heldur nokkur tímabil.   Óljóst er hvað þeim gengur til með því. Þegar þetta er skrifað (ágúst 2013) hafa verið merktir um 1500 fiskar í 12 ám.  Hér má sjá töflu yfir endurheimtur eftir tegundum á veiðiám.  Hafa ber í huga að endurveiðihlutfall ákvarðast ekki bara af lifun fiskjar, heldur einnig af veiðihlutfalli.  Rannsóknir benda til að veiðihlutfall á laxi sé nærri 70% en það er heldur óljósara á bleikju, sennilega afar breytilegt og gæti verið 20%-60%. – með áherslu á “gæti verið”. endurveidi_eyjafjordur_2012   Við hvetjum alla veiðimenn til að skila inn upplýsingum um merktan fisk.  Einnig vantar okkur, til aldursgreiningar,  hausa af drepnum fiski, ásamt hefðbundum veiðibókarupplýsingum (lengd/þyngd, staður/stund, kyn/tegund, veiðimaður/agn). Auglýsing merki 2010

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