Reproduction and Spawning

Wright, Peter J.; Rowe, Sherrylynn

doi:10.1002/9781119460701.ch3

Cited by 9 publications

(8 citation statements)

References 233 publications

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“…In the present study area, fishing pressure was historically much higher in coastal areas (Engelhard et al, 2014) during the period when North Sea coastal populations have undergone large changes in maturation schedules (Wright et al, 2011). Despite intense fishing pressure, the present study suggests there is still a rich population structure, although there is some suggestion from past changes in egg density and areas where spawning adults are no longer recorded that some historic spawning grounds have been lost in Scottish coastal waters (Wright & Rowe, 2019). As small, resident populations tend to inhabit coastal grounds, it is possible that some small components of the stocks have been lost.…”

Section: Discussionmentioning

confidence: 48%

“…As cod are known to aggregate to spawn (Wright & Rowe, 2019) but tend to disperse when feeding, we sampled in autumn, shortly after the time they allocate energy to secondary gametogenesis (November -December), and thereafter during spawning (February -March).…”

Section: Samplingmentioning

confidence: 99%

“…Atlantic cod, Gadus morhua, is well suited to studying population diversity and reproductive traits as there is already considerable information on both genetic divergence (Bradbury et al, 2013; Barth et al, 2017) and variation in maturity and fecundity (Wright & Rowe, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Linking scales of life-history variation with population structure in Atlantic cod

Wright

Doyle

Taggart

et al. 2020

Preprint

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It is increasing recognised that sustainable exploitation of marine fish requires the consideration of population diversity and associated productivity. This study used a combination of genotypic screening and phenotypic traits to define the scale of population structuring in Atlantic cod inhabiting the northern North Sea (ICES 4a) and Scottish west coast (6a). The genetic analysis indicated an isolation by distance pattern with an even finer scale structuring than previously reported, that persisted over a decade and between feeding and spawning seasons. Spatial variation in phenotypic traits reflected genetic variation with cod maturing later and at a larger size near the Viking Bank in 4a. The identified population structuring provides an explanation for differences in historic changes in maturation schedules and the temperature exposure recorded in previous electronic tagging studies. The study also highlights how the mismatch between stock divisions and population units is leading to a misunderstanding about stock recovery.

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Section: Discussionmentioning

confidence: 48%

Section: Samplingmentioning

confidence: 99%

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Linking scales of life-history variation with population structure in Atlantic cod

Wright

Doyle

Taggart

et al. 2020

Preprint

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show abstract

“…As cod are known to aggregate to spawn (Wright and Rowe, 2019) but tend to disperse when feeding, we sampled in autumn, shortly after the time they allocate energy to secondary gametogenesis (November-December), and thereafter during spawning (February-March). A total of 721 cod were sampled in November to December in 2013, when early stages of oogenesis could be detected histologically (Yoneda and Wright, 2005) and a further 803 during the spawning season between February and March (Gonzalez-Irusta and Wright, 2016) in 2013 and 2014.…”

Section: Samplingmentioning

confidence: 99%

“…Atlantic cod, Gadus morhua, is well-suited to studying population diversity and reproductive traits as there is already considerable information on both genetic divergence (Bradbury et al, 2013;Barth et al, 2017) and variation in maturity and fecundity (Wright and Rowe, 2019). Like most marine fish the level of genetic differentiation based on unlinked neutral SNPs appears to be very low in Atlantic cod (Bradbury et al, 2013;Berg et al, 2015) with most reported genomic divergence being related to polymorphic chromosomal rearrangements linked to adaptive loci (Bradbury et al, 2013;Berg et al, 2015;Sodeland et al, 2016;Fairweather et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Linking Scales of Life-History Variation With Population Structure in Atlantic Cod

et al. 2021

Self Cite

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It is increasingly recognised that sustainable exploitation of marine fish requires the consideration of population diversity and associated productivity. This study used a combination of genotypic screening and phenotypic traits to define the scale of population structuring in Atlantic cod inhabiting the northern North Sea (ICES Sub-division 4a) and Scottish west coast (ICES Division 6a). The genetic analysis indicated an isolation by distance pattern with an even finer scale structuring than previously reported, that persisted over a decade and between feeding and spawning seasons. Spatial variation in phenotypic traits reflected genetic variation with cod maturing later and at a larger size near the Viking Bank in 4a. The identified population structuring provides an explanation for differences in historic changes in maturation schedules and the temperature exposure recorded in previous electronic tagging studies. The study also highlights how the mismatch between stock divisions and population units is leading to a misunderstanding about stock recovery.

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Development of a new ‘ultrametric’ method for assessing spawning progression in female teleost serial spawners

Anderson

Alix

Charitonidou

et al. 2020

Sci Rep

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The collection and presentation of accurate reproductive data from wild fish has historically been somewhat problematic, especially for serially spawning species. Therefore, the aim of the current study was to develop a novel method of assessing female spawning status that is robust to variation in oocyte dynamics between specimens. Atlantic cod (Barents Sea stock) were used to develop the new 'ultrametric' method, that is based on the progressive depletion of the vitellogenic oocyte pool relative to the rather constant previtellogenic oocyte (PVO) pool. Fish were subsequently partitioned into one of four categories that accurately reflected changes in their oocyte size frequency distribution characteristics and gonadosomatic index throughout spawning. the ultrametric method overcomes difficulties associated with presence of bimodal oocyte distributions, oocyte tails, lack of clear hiatus region, and presence of free ova, and can be implemented at a single sampling point. Much of the workflow is fully automated, and the technique may circumvent the need for histological analysis depending on the desired outcome. The ultrametric method differs from the traditional autodiametric method in that PVOs can be separated by ultrasonication and then enumerated, and ovarian homogeneity is not a mandatory requirement per se. The method is designed for determinate spawners but might be extended to include indeterminate spawners.

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Reproduction and Spawning

Cited by 9 publications

References 233 publications

Linking scales of life-history variation with population structure in Atlantic cod

Linking scales of life-history variation with population structure in Atlantic cod

Linking Scales of Life-History Variation With Population Structure in Atlantic Cod

Development of a new ‘ultrametric’ method for assessing spawning progression in female teleost serial spawners

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