Fróðskaparrit - 01.01.2001, Page 137

141
News and Progress 2000
Nýtt innan vísindi í 2000
✓
PhD-theses / Arsins doktarar 2000
Jan Arge Jacobsen
Doktararitgerð um laksakanningar norðan fyri Føroyar
í mai 2000 vardi hann doktararitgerð við
Universitetið í Bergen við heitinum "As-
pects of the marine ecology of Atlantic sal-
mon (Salmo salar L.)".
Laksakanningar norðan fyri Føroyar
Havøkið norðan fyri Føroyar er týdningar-
mikið føði- og uppvakstrarøki hjá laksi, tá
ið hann er farin úr áunum út á hav. Laksa-
kanningamar høvdu sum endamál at læra
meir um leiklutin hjá laksi í hesi vistfrøði-
ligu skipan.
Kannað var, hvaðani laksurin stavar, ið
gongur á beiti norðanfyri í vetrarhálvuni.
Alilaksur, ið onkursvegna er sloppin úr ali-
brúkum, er at finna millum villa laksin í
sjónum. Kannað var, hvussu hesin laksur
klárar seg millum villa laksin á víðum havi
- ferðast hann, og etur hann á sama hátt
sum hin villi laksurin?
Laksalús er eisini at finna á laksi á opn-
um havi. Kannað var, um alilaksurin er
meira fongdur við lús enn villi laksurin.
Abstract
The thesis focuses on the oceanic life-his-
tory of Atlantic salmon (Salmo salar L.) in
the Northeast Atlantic Ocean. The main
aims were to study the spatial and temporal
stock structure of salmon, their feeding
habits in the high seas, and possible inter-
actions of escaped farmed salmon with
wild salmon. The productive frontal areas
north of the Faroe Islands and in the Nor-
wegian Sea are important feeding grounds
for salmon, and a fishery for salmon has
developed in these areas. The fish was
sampled by floating long-lines during au-
tumn (November-December) and winter
(January-March), and a total of about
25,000 salmon have been examined during
this study.
Salmon that had escaped from fish farms
were found intermingled with wild salmon
in the high seas. The proportion of escaped
fish in the fishery was low until 1988, when
it increased and reached a peak around
1990 and decreased again in recent years. It
is concluded that if farmed components in
Fróðskaparrit 49. bók 2001: 141-151