There are no translations available.

Ni√įurst√∂√įur fiskiranns√≥kna √≠ vatnakerfi Elli√įa√°nna 2022

Jóhannes Sturlaugsson


Ellidaar-fiskteljari-2022-LAXFISKAR2

Myndin h√©r a√į ofan s√Ĺnir 3 merkta laxa √≠ fiskteljaranum √≠ Elli√įa√°num √≠ j√ļl√≠ 2022 (2 √∂rmerkta sbr. vei√įiugga √ĺeirra vantar og einn me√į √ļtvortis sl√∂ngumerki sem sj√° m√° ne√įan bakugga).


Ni√įurst√∂√įur √°rlegra ranns√≥kna Laxfiska √≠ Elli√įa√°num 2022 fyrir Orkuveitu Reykjav√≠kur sem unnar eru √≠ samvinnu vi√į Stangavei√įif√©lag Reykjav√≠kur vitnu√įu um a√į stofnar lax og urri√įa √≠ Elli√įa√°num v√¶ru √≠ mj√∂g g√≥√įu √°standi. Ni√įurst√∂√įurnar voru settar fram √≠ 2 sk√Ĺrslum. Annars vegar √≠ √°rlegri sk√Ĺrslu langt√≠mav√∂ktunar √° fiskistofnum √≠ vatnakerfi Elli√įa√°nna Elli√įa√°r 2022 - Ranns√≥knir √° fiskistofnum vatnakerfisins og hins vegar √≠ sk√Ĺrslunni √Ārb√¶jarkv√≠sl Elli√įa√°nna - Fiskiranns√≥knir 2022

 

Ganga laxins √≠ Elli√įa√°rnar 2022 samanst√≥√į af r√≠flega 1600 l√∂xum sem n√°nast allir t√≥ku √ĺ√°tt √≠ hrygningunni √ĺv√≠ laxvei√įar √≠ √°nni byggja alfari√į √° √ĺv√≠ a√į vei√įa og sleppa. Enduheimtur √° afturbata hoplaxi sumari√į 2022 fr√° merkingum √° hrygningarlaxi √≠ √Ārb√¶jarkv√≠sl 2021 g√°fu forvitnilega inns√Ĺn √≠ v√¶gi hrygningarlaxa √° √ĺv√≠ l√≠fsskei√įi √≠ g√∂ngu laxins √≠ Elli√įa√°rnar 2022. Talningar iŐĀ AŐĀrb√¶jarkviŐĀsl √° hrygningart√≠ma 2022 s√Ĺndu a√į √ĺ√° voru √ĺar √° bilinu 192 til 212 laxar e√įa um 8% af √ĺeim l√∂xum sem gengu √≠ Elli√įa√°rnar √ĺa√į sumar. Sei√įab√ļskapur √≠ vatnakerfi Elli√įa√°nna var g√≥√įur 2022.  G√≥√į sta√įa laxins √≠  Elli√įa√°num vitnar um gott √°stand vistkerfis √ĺessarar gersemi Reykjv√≠kurborgar.

                     Ocean distribution of Atlantic salmon                                       mapped using pop-up satellite tags

Jóhannes Sturlaugsson

In June 2021 the paper ‚ÄěRedefining the oceanic distribution of Atlantic salmon" was published in  Nature Scientific Reports. Based on the main findings of a international study led by Audun Rikardsen at Arctic University of Norway, the paper covers the marine distribution of Atlantic salmon and gives new important knowledge on some of the major environmental factors that influence the distribution and other behaviour of the salmon. Data was sampled by tagging salmon with pop-up satellite archival tags. Post-spawned salmon was tagged when they migrated to the ocean from seven European areas in Norway, Denmark, Ireland, Spain and Iceland. Maiden North American salmon was also captured and tagged at sea at West Greenland.

atlantic_salmon_from_laxa_iceland-migration_route_from_po-up_satellite_ tag_data-laxfiskar-johannes_sturlaugsson

 

The salmon tagged in Iceland was tagged in spring 2011 by Johannes Sturlaugsson at the research company Laxfiskar. Johannes used pop-up satellite archival tags (PSATs) to map the ocean distribution of post-spawned salmon from river Laxa in Adaldal NE - Iceland.
In June 2021 the paper ‚ÄěRedefining the oceanic distribution of Atlantic salmon‚Äú was published in  Nature Scientific Reports. Based on the main findings of a international study led by Audun Rikardsen at Arctic University of Norway, the paper covers the marine distribution of Atlantic salmon and gives new important knowledge on some of the major environmental factors that influence the distribution and other behaviour of the salmon. Data was sampled by tagging salmon with pop-up satellite archival tags. Post-spawned salmon was tagged when they migrated to the ocean from seven European areas in Norway, Denmark, Ireland, Spain and Iceland. Maiden North American salmon was also captured and tagged at sea at West Greenland.

The salmon tagged in Iceland was tagged in spring 2011 by Johannes Sturlaugsson at the research company Laxfiskar. Johannes used pop-up satellite archival tags (PSATs) to map the ocean distribution of post-spawned salmon from river Laxa in Adaldal NE - Iceland.

Here below is a video showing the coverage of Kastlj√≥s (Spotlight) at The Icelandic National Broadcasting Service(R√öV) on the part of the study carried out in Iceland by Johannes Sturlaugsson/Laxfiskar. 

lax_i_sjo-kastljos_fjallar_um_kortlagningu_a_ferdum_laxins

There are no translations available.

Forsvarsa√įilar Hafranns√≥knastofnunar sni√įgengu l√∂g og vanda√įa stj√≥rns√Ĺsluh√¶tti er √ĺeir notu√įu og birtu √≠ leyfisleysi √≥birt ranns√≥knarg√∂gn J√≥hannesar Sturlaugssonar / Laxfiska

Jóhannes Sturlaugsson

 

√ć √°liti sem Umbo√įsma√įur Al√ĺingis birti n√Ĺveri√į vegna kv√∂rtunar √° starfsh√°ttum √ĺ√°verandi forstj√≥ra Hafranns√≥knastofnunar og svi√įsstj√≥ra hj√° s√∂mu stofnun, er a√į finna √°fellisd√≥m er tekur til √ĺess skorts √° v√≠sindasi√įfer√įi sem √ĺar var til umfj√∂llunar. Hafranns√≥knastofnun var√į uppv√≠s a√į √ĺv√≠ a√į taka, nota og birta √≥birt ranns√≥knarg√∂gn √≠ eigu J√≥hannesar Sturlaugssonar hj√° Laxfiskum √≠ desember 2018 √°n vitneskju hans e√įa leyfis. Um var a√į r√¶√įa arfger√įarg√∂gn fr√° eldisl√∂xum √ļr F√≠fusta√įadals√° √≠ Arnarfir√įi og tilheyrandi upprunagreiningu √ĺeirra. √ć kj√∂lfari√į kvarta√įi eigandi gagnanna √≠ byrjun jan√ļar 2019 til Hafranns√≥knastofnunar yfir √ĺeim vinnubr√∂g√įum. √ć √ĺv√≠ skyni a√į lenda √ĺessu m√°li var forsvarsa√įilum Hafranns√≥knastofnunar s√≠√įan bo√įinn s√° kostur a√į bi√įjast afs√∂kunar √° framfer√įi s√≠nu. En einnig √ĺyrftu √ĺeir a√į sj√° til √ĺess a√į √ĺar sem g√∂gnin voru birt af h√°lfu Hafr√≥ sem eigin g√∂gn v√¶ru, √ĺ√° v√¶ri tilgreint a√į √ĺar v√¶ru um a√į r√¶√įa g√∂gn J√≥hannesar/Laxfiska. Skemmst er fr√° a√į segja a√į forsvarsa√įilar Hafranns√≥knastofnunar virtu ekki √ĺ√° b√≥n. Vegna umr√¶ddra starfsh√°tta var kvarta√į til Umbo√įsmanns Al√ĺingis sem t√≥k m√°li√į til me√įfer√įar og lauk √ĺv√≠ me√į √°liti √ĺv√≠ sem birt var 30. apr√≠l 2021. A√į ne√įan er a√į finna hlekk √° √ĺa√į √°lit Umbo√įsmanns Al√ĺingis. H√©r er vi√į h√¶fi a√į nefna s√©rstaklega fimm atri√įi sem komi√į er inn √° √ĺv√≠ √°liti Umbo√įsmanns Al√ĺingis (1-5):

 


1. √ć √°liti Umbo√įsmanns Al√ĺingis kemur fram √ĺa√į √≥l√∂gm√¶ti og si√įleysi sem f√≥lst √≠ √ĺv√≠ af h√°lfu forsvarsa√įila Hafranns√≥knastofnunar a√į nota og birta √≥birt ranns√≥knarg√∂gn J√≥hannesar Sturlaugssonar hj√° Laxfiskum √°n hans leyfis.


2. √ć √°liti Umbo√įsmanns Al√ĺingis er viki√į or√įum a√į t√∂lvup√≥stum fr√° fyrrverandi forstj√≥ra Hafranns√≥knastofnunar til J√≥hannesar Sturlaugssonar eiganda Laxfiska me√į v√≠sun √≠ innihald √ĺeirra og me√į hli√įsj√≥n af reglum er gilda um h√°tterni opinberra starfsmanna (sbr. 1. mgr. 14. gr. laga nr. 70/1996). √ć √ĺv√≠ sambandi telur Umbo√įsma√įur Al√ĺingis r√©tt ‚Äěa√į √≠treka a√į Hafranns√≥knastofnun og starfsm√∂nnum hennar ber √≠ samr√¶mi vi√į vanda√įa stj√≥rns√Ĺsluh√¶tti a√į haga samskiptum s√≠num vi√į √ĺ√° sem til hennar leita me√į √ĺeim h√¶tti a√į g√¶tt s√© hlutleysis, sanngirni og fyllstu kurteisi √≠ gar√į √ĺeirra sem leita til stofnunarinnar me√į erindi s√≠n.‚Äú


3. √ć √°liti Umbo√įsmanns Al√ĺingis kemur fram a√į forsvarsa√įilar Hafr√≥ bi√įjast ekki afs√∂kunar √° framfer√įi s√≠nu fyrr en eftir √≠treku√į tilm√¶li √ĺar a√į l√ļtandi fr√° Umbo√įsmanni Al√ĺingis.


4. √ć √°liti Umbo√įsmanns Al√ĺingis kemur fram a√į forsvarsa√įilar Hafr√≥ ur√įu ekki vi√į √ĺeirri bei√įni a√į geta eiganda ranns√≥knargagnanna √ĺar sem √ĺau voru birt af √ĺeirra h√°lfu sem eigin v√¶ru (√≠ veffr√©tt og s√≠√įar √≠ sk√Ĺrslum).


5. √ć √°liti Umbo√įsmanns Al√ĺingis kemur fram a√į √ĺ√°verandi forstj√≥ri Hafranns√≥knastofnunar greindi Umbo√įsmanni Al√ĺingis ranglega fr√° m√°lav√∂xtum.

 

√Ālit Umbo√įsmanns (M√°l. nr. 10358/2020) er a√į finna √° eftirfarandi hlekk: https://www.umbodsmadur.is/alit-og-bref/mal/nr/8596/skoda/mal/

 

Morgunbla√įi√į fjalla√įi um m√°li√į 11. ma√≠, b√¶√įi √≠tarlega √≠ bla√įinu og einnig √° vefs√≠√įu sinni: https://www.mbl.is/200milur/frettir/2021/05/11/hafro_birti_rannsoknargogn_an_leyfis/


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Atferli bleikju √≠ √ěingvallavatni skr√°√į √°ri√į um kring

Jóhannes Sturlaugsson

 

Fer√įir fiska af m√∂rgum tegundum og stofnum er einn af √ĺeim √ĺ√°ttum n√°tt√ļrunnar sem e√įli m√°lsins samkv√¶mt hefur lengst af veri√į m√∂nnum hulinn √≠ sm√°atri√įum. Me√į tilkomu rafeindafiskmerkja hafa opnast √Ĺmsir m√∂guleikar til a√į afla √≠tarlegra uppl√Ĺsinga um heg√įun og umhverfi (atferlisvistfr√¶√įi) fiska, jafnvel svo √°rum skiptir. Undangengin 22 √°r hef √©g √°rlega rannsaka√į atferlisvistfr√¶√įi urri√įa √≠ √ěingvallavatni me√į rafeindafiskmerkjum. Jafnvel √ĺ√≥ svo a√į √©g hafi l√≠tillega nota√į rafeindafiskmerki til a√į sko√įa heg√įun bleikju √≠ √ěingvallavatni √° √°rum √°√įur (2007-2008), √ĺ√° var √ĺa√į ekki fyrr en sumari√į 2018 sem √©g nota√įi √ĺ√° t√¶kni til a√į afla samfelldra atferlisgagna um bleikjurnar √°ri√į um kring √≠ √ěingvallavatni. √ć √ĺeirri v√∂ktun minni √° heg√įun bleikjanna √ĺ√° eru rafeindafiskmerki af ger√į hlj√≥√įsendimerkja grundv√∂llur gagnas√∂fnunarinnar, sem og tilheyrandi s√≠ritandi skr√°ningast√∂√įvar sem starfr√¶ktar eru v√≠tt og breitt um √ěingvallavatn. √ěannig gefst f√¶ri √° a√į kortleggja landfr√¶√įilega sta√įsetningu bleikjanna √°ri√į um kring, anna√į atferli √ĺeirra (fiskd√Ĺpi) og vatnshitann sem √ĺ√¶r upplifa. Sl√≠kar uppl√Ĺsingar eru einnig skr√°√įar fyrir √ĺ√° urri√įa sem vakta√įir eru me√į sama h√¶tti.

√Čg hef n√ļ √ĺegar merkt me√į hlj√≥√įsendimerkjum 17 bleikjur af √ĺremur svipger√įum. √ěar er um a√į r√¶√įa murtu, ku√įungableikju, og r√°nbleikju, en dvergbleikjan sem stendur fyrir fj√≥r√įu svipger√į bleikjanna √≠ √ěingavallavatni hefur enn ekki komi√į vi√į s√∂gu ranns√≥knarinnar. Ranns√≥kn √ĺessi hefur skila√į um 200 √ĺ√ļsund skr√°ningum fr√° fer√įum bleikjanna, yfir t√≠mabili√į fr√° sumrinu 2018 √ĺar til g√∂gnum var s√≠√įast hla√įi√į ni√įur sumari√į 2020.

Ranns√≥knin hefur √ĺegar leitt √≠ lj√≥s a√į hluti fiskanna sem fylgt var eftir, allt fr√° murtum sem voru √≠ kringum 20 cm a√į lengd til st√≥rvaxinna bleikja, √°ttu √ĺa√į til a√į n√Ĺta s√©r √∂ll helstu sv√¶√įi √ěingvallavatns √° innan vi√į einu √°ri. En jafnframt voru d√¶mi um √ĺa√į a√į bleikjur h√©ldu sig √° vissum sv√¶√įum vatnsins √°ri√į um kring. Landfr√¶√įilegu uppl√Ĺsingarnar yfir dvalarsta√įi bleikjanna gefa f√¶ri √° a√į afmarka hrygningarsv√¶√įi √ĺeirra, vetursetusv√¶√įi og sv√¶√įin sem √¶tisg√∂ngurnar taka til.

√ör h√≥pi bleikjanna m√° nefna fr√≥√įlegar uppl√Ĺsingar fr√° t√¶plega tveggja √°ra r√∂√į skr√°ninga √° fer√įum st√¶rstu bleikjunnar, sem var 15 √°ra og 62 cm l√∂ng √ĺegar h√ļn veiddist sumari√į 2020. S√° fiskur dvaldi v√≠√įa √≠ sy√įri hluta vatnsins √ĺar sem hann var merktur og f√≥r einnig um mi√įbik vatnsins en gekk aldrei √≠ nyrsta hluta √ěingvallavatns. Skr√°ningar √ĺess fisks s√Ĺndu fr√≥√įlega vanafestu √≠ fer√įum fisksins m.t.t. √°rst√≠ma √ĺessi 2 √°r.

Hitam√¶lingarnar sem bleikjurnar framkv√¶mdu √° fer√įal√∂gum s√≠num s√Ĺndu ennfremur a√į √ĺegar kaldur fa√įmur vetrarins umvefur undirdj√ļp √ěingvallavatns, √ĺ√° √°ttu bleikjurnar √ĺa√į til a√į dvelja √° sv√¶√įum √ĺar sem yls naut vi√į vegna innstreymis volgra linda undan Nesjahrauninu.

√ěegar liti√į er til atferlis murtunnar √ĺ√° hefur ranns√≥knin ekki einungis gefi√į n√Ĺja inns√Ĺn √≠ hvernig s√° sm√°i og kn√°i fiskur fer v√≠tt og breitt um vatni√į me√į hli√įsj√≥n af √°rst√≠ma, heldur einnig skila√į s√©rlega fr√≥√įlegum uppl√Ĺsingum um √° hva√įa d√Ĺpi murtan heldur sig √° hverjum t√≠ma; allt fr√° yfirbor√įi og ni√įur √° 100 metra e√įa meira √° d√Ĺpstu sv√¶√įum √ěingvallavatns.

      bleikja_rnr4_murta_thingvallavatni-dvalarsvaedi_atferli_yfir_1_ar-johannes_sturlaugsson_laxfiskar

 

Bleikjan √≠ √ěingvallavatni hefur lengi vaki√į forvitni √ĺeirra sem rannsaka√į hafa fiska √≠ ferskvatni h√©rlendis. Sporg√∂nguma√įur √≠slenskra fiskiranns√≥kna, Bjarni S√¶mundsson rannsaka√įi bleikjuna √≠ √ěingvallavatni √≠ lok 19. aldar og √≠ upphafi 20. aldar. √ě√° setti Bjarni fram uppl√Ĺsingar um √ĺessar 4 svipger√įir bleikja √° grunni √ĺeirra nafngifta sem b√¶ndur vi√į vatni√į notu√įu √° √ĺeim t√≠ma til a√įgreiningar √° √ĺeim. Bleikjan √≠ √ěingvallavatni var s√≠√įan ranns√∂ku√į √≠tarlega √° margv√≠slegan m√°ta √ĺegar kom fram √° 20. √∂ldina og g√≥√įa samantekt um √ĺ√¶r ranns√≥knir er a√į finna √≠ b√≥kinni √ěingvallavatn - undraheimur √≠ m√≥tun (2002), sem P√©tur M. J√≥nasson og P√°ll Hersteinsson ritst√Ĺr√įu (sj√° kaflann Bleikjan: Sigur√įur S. Snorrason o.fl.). √ěa√į er s√≠√įan sumari√į 2018 sem n√Ĺr kafli h√≥fst √≠ ranns√≥knum √° bleikjunni √≠ √ěingvallavatni me√į umr√¶ddri v√∂ktun minni √≠ √ěingvallavatni √°ri√į um kring √° atferlisvistfr√¶√įi bleikja af mismunandi svipger√įum.

Ranns√≥kn m√≠n √° atferlisvistfr√¶√įi bleikju √≠ √ěingvallavatni kallast √° vi√į atferlisranns√≥knir m√≠nar √° urri√įanum √≠ √ěingvallavatni. G√∂gnin sem ranns√≥knin skilar gera √≠ senn kleift a√į kortleggja meginmynstri√į √≠ √°rst√≠√įabundinni heg√įun bleikja af mismunandi svipger√įum, en um lei√į √ĺann breytileika sem fyrirfinnst √≠ heg√įun einstaklinganna. Skr√°ningar √°ri√į um kring √≠ √ěingvallavatni er s√Ĺna dvalarsv√¶√įi bleikja, a√įra heg√įun √ĺeirra og vatnshitann sem √ĺ√¶r upplifa, voru framkv√¶mdar √° s√∂mu sv√¶√įum √° sama t√≠ma √° sama h√°tt fyrir urri√įa af 3 stofnum (√Ėxar√°, √Ėlfusvatns√° og √ötfalli). √ěessi samhli√įa skr√°ning √° atferlisvistfr√¶√įi bleikja af mismunandi svipger√įum og fyrir urri√įa af mismunandi stofnum, er gott d√¶mi um hvernig auka megi gagnsemi atferlisranns√≥kna √° fiskum. Sem h√©r er gert me√į √ĺv√≠ a√į beita skilvirkri n√ļt√≠mat√¶kni √≠ ranns√≥knum til a√į framkv√¶ma √≠tarlegar og hagn√Ĺtar atferlisranns√≥knir √° fiskum yfir v√≠√įfe√įm sv√¶√įi, √ĺar sem landfr√¶√įileg √ļtbrei√įsla er kortl√∂g√į jafnhli√įa. Ranns√≥kn sem gerir kleift a√į safna samt√≠mis uppl√Ĺsingum um mismunandi fisktegundir, fiskistofna og svipger√įir fiska, auk √ĺess sem sko√įa m√° heg√įun fiskanna n√°nar √ļt fr√° st√¶r√į √ĺeirra, l√≠fsstigi, kyni og kyn√ĺroska√°standi. Ranns√≥knin vitnar jafnframt um √ĺ√° spennandi m√∂guleika sem felast √≠ √ĺv√≠ a√į skr√° samhli√įa uppl√Ĺsingar um afr√¶ningja og br√°√į hans, l√≠kt og tilfelli√į er √≠ ranns√≥kn minni √° st√≥rurri√įanum og helstu br√°√į hans murtunni.

H√©r a√į ne√įan m√° sj√° umfj√∂llun St√∂√įvar 2 um ranns√≥knina √≠ fr√©ttum √ĺann 2. okt√≥ber 2020.

bleikja_i_thingvallavatni-atferlisrannsokn-johannes_ sturlaugsson-laxfiskar

 

  Oldest brown trout in Lake Thingvallavatn 19 years old 2019

Johannes Sturlaugsson

thingvallaurridi-brown_trout-salmo_trutta-copyright_johannes_sturlaugsson_laxfiskarPicture shows a male brown trout in river Oxara

During my annual monitoring of the brown trout in Lake Thingvallavatn for roughly 20 years, I have experienced many significant changes. For example, the brown trout stocks has expanded enormously during that period. In 1999 the number of spawners participating in spawning in the rivers were within 100, but last autumn they were around 3000. Also, the numbers of inactive spawners taking a break from spawning 2019, were estimated around 1000. So the total numbers of spawners in 2019 were around 4000, when considering the number of both the active and the inactive spawners. In addition to the spawners, there are all the thousands of immature brown trout in the lake. These piscivorous brown trout stocks of Lake Thingvallavatn are characterized by longevity, late maturation and hence a large body size. An immature fish can e.g. exceed 10 kg in body weight. The largest brown trout in my studies according to weight was a female that weighed 12,7 kg, but the longest one was 111 cm long old and skinny male. The brown trout of stocks of Lake Thingvallavatn and some other brown trout stocks from other lakes also located in higher areas inland are often called Iceage brown trout in Iceland (ice. √≠saldarurri√įi), for they were landlocked after the land rose following the last iceage. The features of the brown trout stocks in Lake Thingvallavatn are the same as of the ferox trout stocks in Scotland, Ireland and also Britain.


              Studies show drastic increase in size of stocks in Lake Thingvallavatn              

As my studies on the brown trout in Lake Thingvallavatn show, there has been a drastic increase in the size of the stocks, especially during the last decade. Parallel to this is the increased number of larger fish and older fish observed. In the autumn 2019 I  captured many old-timers in river Oxara during my research fishing at the spawning grounds. Whereof the oldest being 19 years old, which is the highest known age of a brown trout in Lake Thingvallavatn. Among these oldest fish at the spawning grounds was one that had participated for 8 years in the spawning, but had also taken a year break from spawning in between, so his total period of spawning participation did cover 12 years. Due to these characteristics of the brown trout in Lake Thingvallavatn, some fish have been captured many times. In some cases the fish was captured, both in the lake itself as well as at the spawning grounds in the rivers. One example of this is a brown trout I managed to recapture for 8 years in a row, when the fish entered the spawning grounds of the river.

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