{"id":41195,"date":"2025-09-22T12:53:27","date_gmt":"2025-09-22T10:53:27","guid":{"rendered":"https:\/\/deepseareporter.dev.phosdev.se\/?p=41195"},"modified":"2025-09-22T12:53:29","modified_gmt":"2025-09-22T10:53:29","slug":"gaddorna-blir-fler-visar-nytt-provfiske","status":"publish","type":"post","link":"https:\/\/deepseareporter.dev.phosdev.se\/sv\/gaddorna-blir-fler-visar-nytt-provfiske\/","title":{"rendered":"G\u00e4ddorna blir fler – visar nytt provfiske"},"content":{"rendered":"\n

I flera \u00e5r har det larmats om att g\u00e4ddorna minskar i Stockholms sk\u00e4rg\u00e5rd. Nu visar nytt provfiske ett tydligt trendbrott. G\u00e4ddan kan vara p\u00e5 v\u00e4g tillbaka.<\/strong><\/p>\n\n\n\n

Text: Arvid Wiclander Mellgren<\/sup><\/p>\n\n\n\n

Henrik C. Andersson \u00e4r fiskekonsulent vid L\u00e4nsstyrelsen i Stockholms l\u00e4n och leder projektet ReFisk \u2013 ett initiativ f\u00f6r att st\u00e4rka rovfiskbest\u00e5nden i sk\u00e4rg\u00e5rdsvikar.<\/p>\n\n\n\n

ReFisk genomf\u00f6rde 2019 och 2020 provfiske efter g\u00e4dda i Stockholms sk\u00e4rg\u00e5rds vikar. D\u00e5 konstaterade man ett svagt g\u00e4ddbest\u00e5nd, men n\u00e4r man i \u00e5r f\u00f6ljde upp provfisket var resultatet desto b\u00e4ttre.<\/p>\n\n\n\n

– Jag \u00e4r sj\u00e4lv lite f\u00f6rv\u00e5nad, det var helt sinnessjuka m\u00e4ngder med fisk i vissa vikar, s\u00e4ger Henrik C. Andersson<\/p>\n\n\n\n

\"\"
Henrik C Anderson vid ett provfiskepass. Foto: Daniel Brelin<\/figcaption><\/figure>\n\n\n\n

Provfisket genomf\u00f6rdes med en ny metod \u2013 fiskesp\u00f6n. I ReFisks metodbeskrivning st\u00e5r det att \u201dRespektive fiskare ska under hela f\u00f6rs\u00f6ket fiska efter b\u00e4sta f\u00f6rm\u00e5ga\u201d<\/em><\/p>\n\n\n\n

Spinnfiske – en risk f\u00f6r felmarginal?<\/strong><\/h2>\n\n\n\n

– Jo det g\u00f6r det, men det g\u00f6r det med alla provfiskemetoder. \u00c4ven med n\u00e4t och ryssjor. Just f\u00f6r g\u00e4dda \u00e4r fiske med sp\u00f6 mer effektivt, eftersom den \u00e4r en bakh\u00e5llsj\u00e4gare som f\u00f6r det mesta st\u00e5r still, s\u00e4ger Henrik C. Andersson.<\/p>\n\n\n\n

Under v\u00e5ren provfiskade de i 26 vikar, varav 13 \u00e4r fredade, allts\u00e5 otill\u00e5tna att fiska i annars. \u00d6vriga 13 var s\u00e5 kallade referensvikar till var och en av de fredade vikarna f\u00f6r att kunna urskilja effekten av fredning i resultatet. I en av referensvikarna, Myttingeviken s\u00f6der om Ljuster\u00f6, f\u00e5ngades 2019 och 2020 l\u00e5ngt under 0,5 g\u00e4ddor per fiskesp\u00f6 och timme.<\/p>\n\n\n\n

\u201dGaranterar ett visst \u00f6kat best\u00e5nd\u201d<\/h2>\n\n\n\n

N\u00e4r provfisket f\u00f6ljdes upp i v\u00e5ras var f\u00f6r\u00e4ndringen tydlig. I Stockholms innersk\u00e4rg\u00e5rd visade \u00e5rets provfiske ett m\u00e5ngdubblat f\u00e5ngstantal. I Myttingeviken f\u00e5ngades nu fyra g\u00e4ddor per sp\u00f6timme.<\/p>\n\n\n\n

– De \u00f6kningar vi ser nu garanterar ett visst \u00f6kat best\u00e5nd, s\u00e5 pass stor \u00e4r skillnaden, s\u00e4ger Henrik C. Andersson.<\/p>\n\n\n\n

Myttingeviken \u00e4r den enda referensviken med h\u00f6gre f\u00e5ngstfrekvens \u00e4n sin motsvarande fredade vik. Henrik C. Andersson menar att detta tyder p\u00e5 att fredning \u00e4r en f\u00f6rvaltningsmetod som fungerar och b\u00f6r till\u00e4mpas p\u00e5 fler och st\u00f6rre omr\u00e5den. Men \u00e4ven i referensvikarna var f\u00e5ngsterna betydligt fler \u00e4n 2019 och 2020.<\/p>\n\n\n\n

– Det har \u00f6kat mer i fredningsomr\u00e5den, men det har \u00f6kat i alla vikar i innersk\u00e4rg\u00e5rden. F\u00f6r\u00e4ndringen \u00e4r inte bara en effekt av fredning. N\u00e5got positivt har h\u00e4nt, s\u00e4ger fiskekonsulenten.<\/p>\n\n\n\n

Nyckeln: Abborre<\/h2>\n\n\n\n

Henrik C. Anderson vet inte s\u00e4kert varf\u00f6r g\u00e4ddan kan ha \u00e5terh\u00e4mtat sig s\u00e5 kraftigt men tror att abborrens roll \u00e4r viktig. N\u00e4r spiggarna blir f\u00f6r m\u00e5nga i sk\u00e4rg\u00e5rdsvikarna \u00e4ter de upp mycket av g\u00e4ddornas \u00e4gg. G\u00e4ddan \u00e4ter generellt inte mycket spigg. Men det g\u00f6r abborren.<\/p>\n\n\n\n

– Jag tror att abborren har en f\u00f6rm\u00e5ga att r\u00e4tta till de problem spiggen orsakar. Den \u00e4r en dedikerad spigg\u00e4tare, s\u00e4ger han.<\/p>\n\n\n\n

En till som tror att abborren kan ha haft en positiv p\u00e5verkan \u00e4r Ulf Bergstr\u00f6m, forskare vid Sveriges lantbruksuniversitet.<\/p>\n\n\n\n

\"\"
Ulf Bergstr\u00f6m, forskare SLU. Foto: Privat<\/figcaption><\/figure>\n\n\n\n

– Jag tror att det kan vara s\u00e5 att fler abborrar gynnar g\u00e4ddan eftersom de \u00e4r b\u00e4ttre p\u00e5 att h\u00e5lla spiggen i schack. Fast det har vi inte unders\u00f6kt, s\u00e5 det \u00e4r bara en fr\u00e5ga om spekulationer. Vi vet att abborrens tillv\u00e4xt \u00f6kat genom \u00f6kad f\u00f6dotillf\u00f6rsel och \u00f6kande temperaturer. Det kan bidra till att trycka ner spiggen. De h\u00e4r mekanismerna unders\u00f6ker vi just nu, s\u00e4ger han.<\/p>\n\n\n\n

Forskaren framh\u00e5ller ocks\u00e5 att man endast sett f\u00f6rb\u00e4ttringar i innersk\u00e4rg\u00e5rden.<\/p>\n\n\n\n

– I mellan- och yttersk\u00e4rg\u00e5rden har vi inte sett n\u00e5gra f\u00f6rb\u00e4ttringar \u00e4n s\u00e5 l\u00e4nge. D\u00e4r har spiggen tagit \u00f6ver och i m\u00e5nga omr\u00e5den slagit ut de lokala best\u00e5nden av rovfisk, s\u00e4ger Ulf Bergstr\u00f6m.<\/p>\n\n\n\n

Henrik C. Andersson konstaterar samma sak.<\/p>\n\n\n\n

– D\u00e4r \u00e4r g\u00e4ddan typ borta, s\u00e4ger han.<\/p>\n\n\n\n

Os\u00e4kert <\/h2>\n\n\n\n

Joakim Hansen, milj\u00f6analytiker vid Stockholms universitet, menar att det \u00e4r f\u00f6r tidigt att dra n\u00e5gra slutsatser om m\u00f6jliga orsaker till provfiskeresultatet \u2013 eller om g\u00e4ddbest\u00e5ndet i innersk\u00e4rg\u00e5rden ens har \u00f6kat.<\/p>\n\n\n\n

\"\"
Joakim Hansen, milj\u00f6analytiker vid Stockholms Universitet. Foto: Privat<\/figcaption><\/figure>\n\n\n\n

– Vi ska inte tolka detta f\u00f6r tidigt, vi m\u00e5ste f\u00f6rst titta p\u00e5 flera faktorer. Hur var v\u00e4dret? Hur var temperaturutvecklingen under v\u00e5ren? N\u00e4r gick isen? Det m\u00e5ste analyseras. Det blir ett forskarsvar fr\u00e5n mig helt enkelt, s\u00e4ger Joakim Hansen.<\/p>\n\n\n\n

Det \u00e4r dock ingen om\u00f6jlighet att g\u00e4ddorna blivit fler. Han lyfter ocks\u00e5 att spiggen verkar ha minskat de senaste \u00e5ren, att fisketrycket i utsj\u00f6n utanf\u00f6r Svealandskusten \u00e4r n\u00e5got l\u00e4gre och att det \u00e4r logiskt att fler fredade sk\u00e4rg\u00e5rdsomr\u00e5den g\u00f6r att g\u00e4ddorna har st\u00f6rre m\u00f6jlighet att \u00f6ka i antal.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Om Deep Sea Reporter: <\/strong>V\u00e5r ambition \u00e4r att granska och skildra fr\u00e5gor som r\u00f6r havet och det liv som finns under ytan. Vi verkar i allm\u00e4nhetens tj\u00e4nst och drivs sj\u00e4lvst\u00e4ndigt i f\u00f6rh\u00e5llande till politiska, kommersiella och andra intressen i samh\u00e4llet.<\/sup><\/p>\n\n\n\n

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