Variability of northeast Arctic cod (Gadus morhua) distribution on the main spawning grounds in relation to biophysical factors
نویسندگان
چکیده
منابع مشابه
Mapping the spawning grounds of North Sea cod (Gadus morhua) by direct and indirect means.
Despite recent evidence for sub-stock structuring, North Sea cod are assessed as a single unit. As a consequence, knowledge of sub-stock trends is poor. In particular, there are no recent evaluations of which spawning grounds are active. Here we report results from the first ichthyoplankton survey to cover the whole North Sea. Also, this survey, conducted in 2004, was the first to make extensiv...
متن کاملFisheries change spawning ground distribution of northeast Arctic cod.
Prior to the 1920s, the northeast Arctic (NA) cod were caught at spawning grounds ranging from the southernmost to the northernmost parts of the Norwegian coast, but have for the last 50 yr mainly been caught around the Lofoten archipelago and northwards. The NA cod have their feeding and nursery grounds in the Barents Sea, and migrate south towards the Norwegian coast in the winter to spawn. T...
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Drastic changes in both ageand length-at-maturity of cod (Gadus morhua) on Flemish Cap have been observed during this decade. In the present paper, growth by cohort in this period was analyzed and compared with the observed trend in maturation. Different cohorts displayed different growth rates, the strongest 1990 year-class showing fastest growth. The compensatory response to lower population ...
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The biology of cod reproduction is well described in the scientific literature. However, sperm biology and spermatozoa management are poorly studied in this species. Because of its recent farming expansion, a better knowledge of cod gametes is becoming especially useful. This work aimed at establishing tools to study sperm biology in cod, and also investigated the existence of changes in cod sp...
متن کاملLong-term change in a behavioural trait: truncated spawning distribution and demography in Northeast Arctic cod
Harvesting may be a potent driver of demographic change and contemporary evolution, which both may have great impacts on animal populations. Research has focused on changes in phenotypic traits that are easily quantifiable and for which time series exist, such as size, age, sex, or gonad size, whereas potential changes in behavioural traits have been under-studied. Here, we analyse potential dr...
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ژورنال
عنوان ژورنال: ICES Journal of Marine Science
سال: 2014
ISSN: 1054-3139,1095-9289
DOI: 10.1093/icesjms/fsu126