Evidence map›Paper›PMID 40328301›Full record

ArticleJournal of fish biology2025

Prematuration differences in male and female Atlantic cod: Investigating sex ratio, length and ecotype disparities in juveniles.

Sander Vollmerhaus Digre, Per Erik Jorde, Arild Folkvord, Jakob Hemmer-Hansen, Halvor Knutsen

Abstract read
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In one paragraph

Article in Journal of fish biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors.

Sander Vollmerhaus DigreDepartment of Biological Sciences, University of Bergen, Bergen, Norway.ORCID https://orcid.org/0009-0003-9290-7303
Per Erik JordeDepartment of Population Genetics, Institute of Marine Research, Nye Flødevigveien 20, Norway.ORCID https://orcid.org/0000-0001-5515-7257
Arild FolkvordDepartment of Biological Sciences, University of Bergen, Institute of Marine Research, Bergen, Norway.ORCID https://orcid.org/0000-0002-4763-0590
Jakob Hemmer-HansenNational Institute of Aquatic Resources, Technical University of Denmark, Silkeborg, Denmark.ORCID https://orcid.org/0000-0002-1033-2565
Halvor KnutsenDepartment of Population Genetics, Institute of Marine Research, Nye Flødevigveien 20, Norway.ORCID https://orcid.org/0000-0002-7627-7634

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Sexual size dimorphism (SSD) and skewed sex ratios are common in the animal kingdom, and marine fishes, such as the Atlantic cod (Gadus morhua), are no exception. This study utilized newly discovered sex-linked genetic markers to investigate young-of-the-year cod in the Skagerrak system, comprising approximately 2700 individuals from North Sea and fjord ecotypes. Overall, no significant difference in sex ratio was observed overall (51% females, 49% males), with consistent findings across 14 locations and three sheltering degrees. Although slightly more females were found in exposed areas, and slightly more males in sheltered regions, these differences were not significant. Size variation between female and male cod was generally negligible. These results indicate a likely purely genetic sex determination system in Atlantic cod and a lack of prematuration growth differences between sexes. This research enhances our understanding of the Atlantic cod, providing more insight into the Atlantic cod population in the Skagerrak and emphasizing the importance of genetic factors in sex determination.

Indexed as

Body SizeEcotypeGadus morhuaSex CharacteristicsSex RatioAnimalsFemaleGenetic MarkersMaleNorth SeaGenetic MarkersAtlantic codecotypesGadus morhuageneticsgenomicsjuvenileNorth Seasex ratiosexual size dimorphismSkagerrak

Identifiers

PMID40328301
PMCPMC12360136

What Socratic holds

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LicenceCC BY-NC
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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.