{"id":57606,"date":"2026-07-13T11:04:42","date_gmt":"2026-07-13T11:04:42","guid":{"rendered":"https:\/\/matis.is\/?p=57606"},"modified":"2026-07-13T11:06:25","modified_gmt":"2026-07-13T11:06:25","slug":"er-haegt-ad-spa-fyrir-um-gaedi-fiskimjols-sem-innihaldsefnis-i-laxeldisfodri-med-litrofsgreiningu","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/frettir\/er-haegt-ad-spa-fyrir-um-gaedi-fiskimjols-sem-innihaldsefnis-i-laxeldisfodri-med-litrofsgreiningu\/","title":{"rendered":"Er h\u00e6gt a\u00f0 sp\u00e1 fyrir um g\u00e6\u00f0i fiskimj\u00f6ls sem innihaldsefnis \u00ed laxeldisf\u00f3\u00f0ri me\u00f0 litr\u00f3fsgreiningu?"},"content":{"rendered":"

The project was recently completed \u201e\u00der\u00f3un mynd- og litr\u00f3fsgreiningarsp\u00e1l\u00edkans til a\u00f0 meta g\u00e6\u00f0i fiskimj\u00f6ls sem innihaldsefnis \u00ed laxeldisf\u00f3\u00f0ri\u201c<\/strong>, sem styrkt var af Matv\u00e6lasj\u00f3\u00f0i og T\u00e6kni\u00fer\u00f3unarsj\u00f3\u00f0i Rann\u00eds. Markmi\u00f0 verkefnisins var a\u00f0 \u00fer\u00f3a sp\u00e1l\u00edkan sem gerir fiskimj\u00f6lsframlei\u00f0endum kleift a\u00f0 meta g\u00e6\u00f0i fiskimj\u00f6ls sem innihaldsefnis \u00ed laxeldisf\u00f3\u00f0ri \u00e1 hra\u00f0virkan, hagkv\u00e6man og n\u00e1kv\u00e6man h\u00e1tt me\u00f0 einfaldri NIR-litr\u00f3fsgreiningu og\/e\u00f0a ofurr\u00f3fsgreiningu (near-infrared spectroscopy<\/em>, NIR \/ hyperspectral imaging<\/em>).<\/p>\n\n\n\n

Flestir \u00edslenskir fiskimj\u00f6lsframlei\u00f0endur nota n\u00fa \u00feegar NIR-t\u00e6kni til a\u00f0 m\u00e6la efnasamsetningu fiskimj\u00f6ls. Sl\u00edkar m\u00e6lingar gefa g\u00f3\u00f0ar uppl\u00fdsingar um efnainnihald mj\u00f6lsins, en n\u00fdtast takmarka\u00f0 \u00feegar meta \u00e1 raunveruleg g\u00e6\u00f0i \u00feess sem hr\u00e1efnis \u00ed fiskeldisf\u00f3\u00f0ur, \u00fear sem meltanleiki n\u00e6ringarefna og \u00e1hrif \u00e1 v\u00f6xt laxa skipta mestu m\u00e1li.<\/p>\n\n\n\n

\u00cd verkefninu var leitast vi\u00f0 a\u00f0 br\u00faa \u00feetta bil me\u00f0 \u00fev\u00ed a\u00f0 tengja g\u00f6gn \u00far NIR-litr\u00f3fsgreiningu og ofurr\u00f3fsgreiningu vi\u00f0 ni\u00f0urst\u00f6\u00f0ur \u00far vaxtar- og meltanleikatilraunum me\u00f0 Atlantshafslax. A\u00f0fer\u00f0in var ekki n\u00fd af n\u00e1linni, \u00fear sem norskir f\u00f3\u00f0urframlei\u00f0endur hafa \u00fer\u00f3a\u00f0 samb\u00e6rileg sp\u00e1l\u00edk\u00f6n og nota\u00f0 \u00feau um \u00e1rabil vi\u00f0 mat \u00e1 g\u00e6\u00f0um \u00feess fiskimj\u00f6ls sem \u00feeir kaupa. \u00deau l\u00edk\u00f6n hafa \u00fe\u00f3 veri\u00f0 var\u00f0veitt sem vi\u00f0skiptaleyndarm\u00e1l og veitt f\u00f3\u00f0urframlei\u00f0endunum samkeppnisforskot.<\/p>\n\n\n\n

Me\u00f0 \u00fer\u00f3un samb\u00e6rilegra NIR-sp\u00e1l\u00edkana fyrir \u00edslenska fiskimj\u00f6lsframlei\u00f0endur var stefnt a\u00f0 \u00fev\u00ed a\u00f0 veita \u00feeim samb\u00e6rilegar uppl\u00fdsingar um eiginleika afur\u00f0a sinna og vi\u00f0skiptavinir \u00feeirra hafa n\u00fa \u00feegar. Sl\u00edk \u00feekking g\u00e6ti styrkt marka\u00f0sst\u00f6\u00f0u \u00edslensks fiskimj\u00f6ls, auki\u00f0 ver\u00f0m\u00e6task\u00f6pun og b\u00e6tt innra g\u00e6\u00f0aeftirlit fyrirt\u00e6kjanna.<\/p>\n\n\n\n

\u00cd dag byggist ver\u00f0lagning \u00edslensks fiskimj\u00f6ls a\u00f0 mestu \u00e1 pr\u00f3teininnihaldi en tekur s\u00ed\u00f0ur mi\u00f0 af g\u00e6\u00f0um eins og meltanleika e\u00f0a \u00e1hrifum \u00e1 v\u00f6xt fiska. \u00dear sem \u00edslenskt fiskimj\u00f6l er yfirleitt framleitt \u00far mj\u00f6g fersku hr\u00e1efni \u00ed t\u00e6kniv\u00e6ddum verksmi\u00f0jum, \u00fear sem vinnsluferli\u00f0 er hanna\u00f0 til a\u00f0 tryggja h\u00e1marksg\u00e6\u00f0i, m\u00e1 \u00e6tla a\u00f0 \u00fea\u00f0 eigi m\u00f6guleika \u00e1 a\u00f0 vera meti\u00f0 \u00e1 fleiri forsendum en pr\u00f3teininnihaldi einu saman.<\/p>\n\n\n\n

Verkefni\u00f0 bygg\u00f0i \u00e1 AVS-forverkefni sem lauk \u00e1ri\u00f0 2021 me\u00f0 \u00fatg\u00e1fu sk\u00fdrslunnar \u201e<\/strong>N\u00e6r-innrau\u00f0 litr\u00f3fsgreining \u2013 Sta\u00f0a \u00feekkingar um notkun NIR \u00ed fiskmj\u00f6lsi\u00f0na\u00f0i<\/a>.\u201c <\/strong>sem og \u00e1 vinnu norr\u00e6ns \u00feekkingarnets um fiskimj\u00f6l og l\u00fdsi (Nordic Center of Excellence Network in Fishmeal and Fish oil<\/a>).<\/p>\n\n\n\n

Gefin hefur veri\u00f0 \u00fat final report of the project<\/strong><\/a> \u00fear sem ger\u00f0 er grein fyrir framkv\u00e6md ranns\u00f3knarinnar og helstu ni\u00f0urst\u00f6\u00f0um. \u00c1grip sk\u00fdrslunnar fer h\u00e9r \u00e1 eftir.<\/p>\n\n\n\n

Abstract<\/strong><\/p>\n\n\n\n

Fiskeldi \u00ed heiminum er \u00ed \u00f6rum vexti og hefur \u00e1 s\u00ed\u00f0ustu \u00e1ratugum veri\u00f0 s\u00fa grein matv\u00e6laframlei\u00f0slu sem vaxi\u00f0 hefur hra\u00f0ast. \u00c1 heimsv\u00edsu hefur fiskeldi aukist a\u00f0 me\u00f0altali um 6,7% \u00e1 \u00e1ri s\u00ed\u00f0ustu \u00ferj\u00e1 \u00e1ratugi. Fiskeldisf\u00f3\u00f0ur hefur \u00fer\u00f3ast samhli\u00f0a \u00feessari uppbyggingu, enda eru innihaldsefnin takm\u00f6rku\u00f0, bera st\u00e6rstan hluta framlei\u00f0slukostna\u00f0ar og r\u00e1\u00f0ast a\u00f0 miklu leyti af kolefnisspori fiskeldis.<\/p>\n\n\n\n

N\u00e1nast allt fiskimj\u00f6l sem framleitt er \u00e1 \u00cdslandi er n\u00fdtt sem innihaldsefni \u00ed laxeldisf\u00f3\u00f0ur, \u00fear sem \u00fea\u00f0 er mikilv\u00e6gur pr\u00f3tein- og orkugjafi. Fiskimj\u00f6l er almennt ver\u00f0lagt \u00fat fr\u00e1 pr\u00f3teininnihaldi, en mat \u00e1 \u00f6\u00f0rum g\u00e6\u00f0aeiginleikum, svo sem meltanleika og \u00e1hrifum \u00e1 v\u00f6xt fiska, er b\u00e6\u00f0i t\u00edmafrekt og kostna\u00f0arsamt og krefst s\u00e9rh\u00e6f\u00f0s b\u00fana\u00f0ar.<\/p>\n\n\n\n

NIR-litr\u00f3fsgreining b\u00fd\u00f0ur hins vegar upp \u00e1 hra\u00f0virkar og \u00f3ey\u00f0andi m\u00e6lingar \u00e1 efnasamsetningu og g\u00e6\u00f0um og hefur veri\u00f0 notu\u00f0 v\u00ed\u00f0a \u00ed sj\u00e1var\u00fatvegi. N\u00e1nast allar fiskimj\u00f6lsverksmi\u00f0jur landsins eiga NIR-t\u00e6ki sem n\u00fdtt eru til innra g\u00e6\u00f0aeftirlits, me\u00f0al annars til a\u00f0 fylgjast me\u00f0 efnasamsetningu og \u00f6\u00f0rum g\u00e6\u00f0abreytum.<\/p>\n\n\n\n

\u00cd \u00feessari ranns\u00f3kn var kanna\u00f0 hvort NIR-litr\u00f3fsgreining g\u00e6ti sp\u00e1\u00f0 fyrir um efnasamsetningu, g\u00e6\u00f0i, meltanleika og vaxtavi\u00f0br\u00f6g\u00f0 Atlantshafslaxa (Salmo salar<\/em>). Safna\u00f0 var 26 fiskmj\u00f6lss\u00fdnum af mismunandi ger\u00f0um og g\u00e6\u00f0um fr\u00e1 innlendum og erlendum framlei\u00f0endum. \u00dar hverju s\u00fdni var framleitt laxeldisf\u00f3\u00f0ur samkv\u00e6mt s\u00f6mu uppskrift og \u00fea\u00f0 s\u00ed\u00f0an pr\u00f3fa\u00f0 \u00ed vaxtar- og meltanleikatilraunum me\u00f0 lifandi fiski. Markmi\u00f0i\u00f0 var a\u00f0 kanna hvort \u00fer\u00f3a m\u00e6tti sp\u00e1l\u00edkan sem g\u00e6ti meti\u00f0 g\u00e6\u00f0i fiskimj\u00f6ls sem hr\u00e1efnis \u00ed laxeldisf\u00f3\u00f0ur og \u00feannig stu\u00f0la\u00f0 a\u00f0 auknum g\u00e6\u00f0um og markvissara ver\u00f0mati \u00e1 fiskimj\u00f6li \u00ed framt\u00ed\u00f0inni.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Alls var 25 fiskimj\u00f6lss\u00fdnum af mismunandi fisktegundum og g\u00e6\u00f0um fr\u00e1 mismunandi framlei\u00f0endum safna\u00f0 og \u00feau send til TTZ \u00ed \u00de\u00fdskalandi, \u00fear sem fiskeldisf\u00f3\u00f0ri\u00f0 var framleitt. Hvert fiskimj\u00f6lss\u00fdni var um 50 kg.<\/p>\n\n\n\n

Val \u00e1 fiskimj\u00f6lss\u00fdnum<\/strong><\/p>\n\n\n\n

Fiskimj\u00f6lss\u00fdnin komu fr\u00e1 n\u00edu mismunandi framlei\u00f0endum og voru unnin \u00far \u00fdmsum fisktegundum, \u00fear \u00e1 me\u00f0al kolmunna, s\u00edld, lo\u00f0nu, makr\u00edl, ansj\u00f3su og Gulf menhaden. Efnagreining s\u00fdndi t\u00f6luver\u00f0an breytileika \u00ed samsetningu s\u00fdnanna. Pr\u00f3teininnihald var \u00e1 bilinu 62,3\u201373,8 g\/100 g, fituinnihald 6,5\u201312,2 g\/100 g og \u00f6skuinnihald 10,6\u201323,8 g\/100 g. Rakainnihald allra s\u00fdna var innan i\u00f0na\u00f0arvi\u00f0mi\u00f0a, e\u00f0a undir 10%.<\/p>\n\n\n\n

Nau\u00f0synlegar am\u00edn\u00f3s\u00fdrur voru a\u00f0 mestu samb\u00e6rilegar milli s\u00fdna, en mestur breytileiki m\u00e6ldist \u00ed l\u00fds\u00edni (4,5\u20136,1 g\/100 g) og val\u00edni (2,8\u20133,6 g\/100 g). Styrkur l\u00edfr\u00e6nna am\u00edna og heildarmagn rokgjarns bas\u00edsks niturs (TVB-N) var mj\u00f6g mismunandi milli s\u00fdna, sem endurspeglar mismunandi ferskleika hr\u00e1efnis og me\u00f0h\u00f6ndlun \u00feess fyrir vinnslu.<\/p>\n\n\n\n

Vaxtar- og meltanleikatilraunir<\/strong><\/p>\n\n\n\n

F\u00f3\u00f0urtilraunirnar voru framkv\u00e6mdar me\u00f0 Atlantshafslaxi (Salmo salar<\/em>) \u00ed tilraunaeldisa\u00f0st\u00f6\u00f0u Mat\u00eds \u00ed Reykjav\u00edk (MARS \u2013 Mat\u00eds Aquaculture Research Station). Hvert f\u00f3\u00f0ur var pr\u00f3fa\u00f0 \u00ed \u00feremur endurtekningum yfir sex vikna t\u00edmabil. Fiskar \u00ed \u00feremur eldiskerjum fengu sama f\u00f3\u00f0ur \u00ed sex vikur og hv\u00edldart\u00edmi var haf\u00f0ur \u00e1 milli tilrauna.<\/p>\n\n\n\n

Meltanleiki hr\u00e1pr\u00f3teins var \u00e1 bilinu 73,0\u201395,8% og meltanleiki am\u00edn\u00f3s\u00fdra svipa\u00f0ur. L\u00fds\u00edn og met\u00edon\u00edn reyndust lykilam\u00edn\u00f3s\u00fdrur \u00fear sem meltanleiki \u00feeirra tengdist sterkast vaxtarvi\u00f0br\u00f6g\u00f0um laxa og f\u00f3\u00f0urn\u00fdtingu. Munur \u00e1 vaxtarhra\u00f0a milli f\u00f3\u00f0urs\u00fdna var hins vegar tilt\u00f6lulega l\u00edtill. S\u00e9rt\u00e6kur vaxtarhra\u00f0i (SGR \u2013 Specific Growth Rate<\/em>) var \u00e1 bilinu 0,84\u20131,14, sem bendir til \u00feess a\u00f0 mismunur \u00ed samsetningu og g\u00e6\u00f0um fiskimj\u00f6ls hafi haft takm\u00f6rku\u00f0 \u00e1hrif \u00e1 heildarvaxtargetu vi\u00f0 \u00fe\u00e6r a\u00f0st\u00e6\u00f0ur sem pr\u00f3fa\u00f0ar voru.<\/p>\n\n\n\n

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Vaxtartilraunir voru framkv\u00e6mdar \u00e1 sei\u00f0um<\/em><\/figcaption><\/figure>\n\n\n\n

NIR-litr\u00f3fsgreining og l\u00edkanager\u00f0<\/strong><\/p>\n\n\n\n

NIR-litr\u00f3f voru m\u00e6ld fyrir \u00f6ll 26 s\u00fdnin me\u00f0 Bruker MPA-t\u00e6ki. Sp\u00e1l\u00edk\u00f6n voru \u00fer\u00f3u\u00f0 me\u00f0 minnstu fervika a\u00f0hvarfsgreiningu (PLSR) og fimm mismunandi forme\u00f0h\u00f6ndlunara\u00f0fer\u00f0um.<\/p>\n\n\n\n

\u00c1rei\u00f0anlegustu sp\u00e1l\u00edk\u00f6nin n\u00e1\u00f0u til rakainnihalds, \u00fear sem krosssta\u00f0festingarstu\u00f0ull (R\u00b2CV) var allt a\u00f0 0,82. Sp\u00e1l\u00edk\u00f6n fyrir vatnsleysanleg pr\u00f3tein s\u00fdndu einnig vi\u00f0unandi sp\u00e1gildi (R\u00b2CV allt a\u00f0 0,65). Hins vegar reyndust sp\u00e1l\u00edk\u00f6n fyrir a\u00f0rar breytur, \u00fear \u00e1 me\u00f0al am\u00edn\u00f3s\u00fdrusamsetningu, l\u00edfr\u00e6n am\u00edn, TVB-N, meltanleika og vaxtarvi\u00f0br\u00f6g\u00f0, almennt \u00f3fulln\u00e6gjandi. L\u00edklegasta sk\u00fdringin er s\u00fa a\u00f0 s\u00fdnasafni\u00f0 var l\u00edti\u00f0 (n = 26), breytileiki milli s\u00fdna takmarka\u00f0ur og gildissvi\u00f0 m\u00e6ldra breyta of \u00fer\u00f6ngt.<\/p>\n\n\n\n

Einnig var kanna\u00f0 hvort ofurr\u00f3fsgreining (hyperspectral imaging<\/em>) g\u00e6ti n\u00fdst vi\u00f0 mat \u00e1 g\u00e6\u00f0um fiskimj\u00f6ls sem innihaldsefnis \u00ed laxeldisf\u00f3\u00f0ri, en fylgnin reyndist enn veikari en me\u00f0 NIR-litr\u00f3fsgreiningu.<\/p>\n\n\n\n

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Meltanleikatilraunir voru ger\u00f0ar \u00e1 fullor\u00f0num fiskum<\/em><\/figcaption><\/figure>\n\n\n\n

Ni\u00f0urst\u00f6\u00f0ur og umr\u00e6\u00f0ur<\/strong><\/p>\n\n\n\n

\u00c1\u00f0ur en ranns\u00f3knin h\u00f3fst var lj\u00f3st a\u00f0 NIR-litr\u00f3fsgreining getur n\u00fdst vel til hra\u00f0greiningar \u00e1 efnasamsetningu og \u00fdmsum g\u00e6\u00f0aeiginleikum fiskimj\u00f6ls. Markmi\u00f0 \u00feessa verkefnis var hins vegar metna\u00f0arfyllra: a\u00f0 tengja efnasamsetningu og g\u00e6\u00f0aeiginleika fiskimj\u00f6ls vi\u00f0 lykilm\u00e6likvar\u00f0a \u00e1 virkni laxeldisf\u00f3\u00f0urs, \u00fe.e. meltanleika og v\u00f6xt. Hef\u00f0i \u00fea\u00f0 tekist hef\u00f0i veri\u00f0 unnt a\u00f0 \u00fer\u00f3a sp\u00e1l\u00edkan sem g\u00e6ti meti\u00f0 \u00e1hrif fiskimj\u00f6ls \u00e1 meltanleika og vaxtar\u00e1rangur laxa \u00e1\u00f0ur en \u00fea\u00f0 v\u00e6ri nota\u00f0 \u00ed f\u00f3\u00f0urframlei\u00f0slu.<\/p>\n\n\n\n

Ni\u00f0urst\u00f6\u00f0urnar s\u00fdna a\u00f0 NIR-litr\u00f3fsgreining hentar vel til hra\u00f0greiningar \u00e1 rakainnihaldi fiskimj\u00f6ls og a\u00f0 nokkru leyti vatnsleysanlegum pr\u00f3teinum. Til a\u00f0 sp\u00e1 \u00e1rei\u00f0anlega fyrir um fl\u00f3knari g\u00e6\u00f0abreytur, svo sem meltanleika og vaxtarvi\u00f0br\u00f6g\u00f0, \u00fearf hins vegar mun st\u00e6rra og fj\u00f6lbreyttara s\u00fdnasafn. \u00dev\u00ed er lagt til a\u00f0 \u00ed framhaldi ver\u00f0i s\u00fdnasafni\u00f0 st\u00e6kka\u00f0, fj\u00f6lbreytni hr\u00e1efnis aukin, tilraunaa\u00f0fer\u00f0ir samr\u00e6mdar og kanna\u00f0ir m\u00f6guleikar \u00f3l\u00ednulegra sp\u00e1l\u00edkana me\u00f0 sj\u00e1lfst\u00e6\u00f0um pr\u00f3funarg\u00f6gnum.<\/p>\n\n\n\n

\u00cd stuttu m\u00e1li t\u00f3kst \u00fev\u00ed ekki a\u00f0 \u00fer\u00f3a \u00fea\u00f0 sp\u00e1l\u00edkan sem stefnt var a\u00f0 \u00ed verkefninu, \u00fear sem fj\u00f6ldi s\u00fdna og breytileiki \u00feeirra reyndist ekki n\u00e6gjanlegur til a\u00f0 byggja upp l\u00edkan sem uppfyllir kr\u00f6fur um \u00e1rei\u00f0anleika.<\/p>\n\n\n\n

The report can be accessed here<\/a> og frekari uppl\u00fdsingar veitir jonas@matis.is<\/a><\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Vel var fylgst me\u00f0 \u00f6llum umhverfis\u00fe\u00e1ttum, eins og vatnsg\u00e6\u00f0um, s\u00farefni, hitastigi ofl.<\/em><\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Meltanleika- og vaxtartilraunir f\u00f3ru fram \u00ed MARS \u00fear sem fj\u00f6ldi eldiss\u00e9rfr\u00e6\u00f0inga starfar<\/em><\/p>\n\n\n\n

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N\u00fdlega lauk verkefninu \u201e\u00der\u00f3un mynd- og litr\u00f3fsgreiningarsp\u00e1l\u00edkans til a\u00f0 meta g\u00e6\u00f0i fiskimj\u00f6ls sem innihaldsefnis \u00ed laxeldisf\u00f3\u00f0ri\u201c, sem styrkt var af 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