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NKML med venner på Lygnin


Chironomus
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Guest StadJon

Takk for turen og mange gode latterkuler, herlig bande å tilbringe dagen med. Det var et fint øyeblikk da pigghåen til Irvin gled forbi under isen første gang, snakk om prakteksemplar.

Om vær og vind osv. er ok til helgen så håper jeg å ta en ny tur da, nytter ikke å fortsette trenden med feilkroka piggskater. Det rare var at begge mine som ble feilkroket i går, kroket seg sel,v og på omtrent akkurat samme sted på kroppen. Barnslig oppførsel egentlig.

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De er der store deler av vinteren, men sjelden vi ser de fødende, så er nok ingen gyteaggregering i hovedsak. Næringssøk, kombinert med spredt gyting vil jeg tro. Tviler sterkt at det er noe særlig vandring mellom midt-norske og skotske bestander. Vi regner med de vandrer ut av Namsenfjorden om våren, men at de reiser helt til Skotland er vel noe tvilsomt - men kan ikke si noe sikkert. Mer sannsynlig at det er noe utveksling mellom bestander lenger sør på vestlandet.

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"Migrations: British and Norwegian scientists have tagged spurdog since the late 1950s, with many thousands

of fish tagged [19,20,21]. Preliminary examination of the data indicated little mixing between northern waters

and southern areas, with the greatest number of recaptures from Scottish and Norwegian waters. Hence, the

existence of Scottish-Norwegian and Channel stocks were claimed [19,22,23]. There were, however, a few

recaptures from outside the area, including the Barents Sea, west coast of Ireland, English Channel and

northern Bay of Biscay [19]. Though fewer fish have been tagged in more southerly areas, fish tagged in the

Irish Sea have moved to northern Scotland and the Celtic Sea, and fish tagged in the Celtic Sea were

recaptured from all around the British Isles [11]. Changes in the migration patterns of spurdog in the North

Sea have also been reported [24]. Hence, the most recent analyses of tagging studies have suggested that

there is a single North-East Atlantic stock [11]. Transatlantic migrations have also been reported, albeit very

infrequently [25,26]."

from.. http://www.ices.dk/marineworld/fishmap/ices/pdf/spurdog.pdf

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