Oocyte recruitment and fecundity type in fishes: Refining terms to reflect underlying processes and drivers

Ganias, Konstantinos; Lowerre‐Barbieri, Susan K.

doi:10.1111/faf.12267

Cited by 31 publications

(40 citation statements)

References 45 publications

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“…The D cOvi values increased gradually in line with the stage of oocyte development ( i ) ( (Supporting Information Figure S6), this observation, together with the OSFD patterns ( Figure 3a) indicated that this species performs a discrete development of oocytes (Ganias & Lowerre-Barbieri, 2018).…”

Section: Resultsmentioning

confidence: 62%

“…The D cOv i values increased gradually in line with the stage of oocyte development ( i ) (Table ). Oocytes at different development stages were simultaneously present during different MATs (Supporting Information Figure S6), this observation, together with the OSFD patterns (Figure a) indicated that this species performs a discrete development of oocytes (Ganias & Lowerre‐Barbieri, ). As shown in Figure b, the L T ‐based O cN i of early secondary growth oocytes (CAO + VTO1) decreased after the peak of spawning activity was reached, suggesting that the standing stock of oocytes is not replaced after this point.…”

Section: Resultsmentioning

confidence: 68%

“…However, regional variability or geographic gradients can also be expected, due to the phenotypic plasticity of these traits (Morgan & Rideout, ). Moreover, there is no snapshot of secondary growth development which can definitively predict the fecundity type (Ganias & Lowerre‐Barbieri, ) and evidence of intermediate traits for both the breeding strategy and the fecundity type are sound because these are no longer considered binary concepts, but continuums (Ganias, ). In this sense, a better understanding of the oocyte recruitment dynamics and the cues involved may help to clarify the fecundity pattern.…”

Section: Discussionmentioning

confidence: 99%

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Trade‐offs between life‐history traits in a coldwater fish in the Mediterranean Sea: the case of blue whiting Micromesistius poutassou

Serrat

Lloret

Frigola‐Tepe

et al. 2019

Journal of Fish Biology

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A combination of traditional and emerging methodologies was used to assess the trade‐offs between several life‐history traits (linked to reproduction and condition) and parasitism in a commercially‐exploited cold‐water species, blue whiting Micromesistius poutassou, in the Mediterranean Sea. The use of histological and gravimetric methods revealed conflicting evidence as to the fecundity type (indeterminate or determinate) of this species. Moreover, there seem to be condition‐mediated compensations between egg quality and egg quantity. The effects of parasitism on reproduction and condition are species‐specific and occur mainly at high intensities of infection; they include a lower batch fecundity (affecting reproductive potential), a higher hepatosomatic index and a higher spleen‐somatic index. Considering the fact that larger fish spawn more eggs and that the minimum landing size is lower than the size at maturity, these results may have implications for the future management of M. poutassou stocks in the Mediterranean Sea. Local environmental conditions may account for geographical differences regarding infection in M. poutassou. Altogether, the results support the idea that the complex trade‐offs between parasitism, reproduction and condition need to be considered in order to understand the status of cold‐water species such as M. poutassou.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

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Trade‐offs between life‐history traits in a coldwater fish in the Mediterranean Sea: the case of blue whiting Micromesistius poutassou

Serrat

Lloret

Frigola‐Tepe

et al. 2019

Journal of Fish Biology

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“…The lack of PG reserves in females with the most developed ovaries indicated that all PG oocytes had been recruited to the SG phase. Complete recruitment of PG oocytes to the SG phase characterises the semelparous life strategy (Ganias & Lowerre‐Barbieri, ). Thus, our result aligns with previous reports that allis shad in the Mondego River is mostly semelparous (Alexandrino, ).…”

Section: Discussionmentioning

confidence: 99%

Primary and secondary oocyte growth dynamics in anadromous semelparous Allis shad Alosa alosa

Mouchlianitis

Belo

Vieira

et al. 2019

Journal of Fish Biology

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We analysed the ovarian dynamics of the anadromous semelparous allis shad Alosa alosa for which our working hypothesis was that mature pre-spawning females would have very low or even exhausted primary growth (PG) oocyte reserves; semelparity has been linked with the depletion of the pool of PG oocytes. To test this hypothesis, the PG oocytes were enumerated, their recruitment pattern to the secondary growth (SG) phase was analysed and their potential replenishment from the pool of oogonia was examined in females caught very close to the Mondego River mouth, in central Portugal and along the river. The development of the SG oocytes was also analysed, the fecundity (batch, total and annual) values were estimated and the intensity of atresia was quantified. Ovarian samples and histological sections were investigated in parallel. A dynamic recruitment pattern of PG oocytes to the SG phase was revealed, where all PG oocytes were recruited and were not replenished by oogonia. Annual fecundity was subject to down-regulation due to atresia prior to spawning and its size was multiple times higher than the size of batch fecundity. Lack of population synchronicity in ovarian development and spawning migration was also observed.This multifaceted analysis of the ovarian dynamics of this species will contribute to management efforts for this critically endangered and economically important fish throughout its geographical distribution. The results reported in this study will also assist in unravelling the complexity of the early processes of oogenesis in fish. K E Y W O R D Salosines, anadromy, fecundity, oocyte recruitment, oogonia, semelparity

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“…However, we encountered difficulties when using this technique with G. morhua and found that the hiatus limits were not always clear (this study). Thus, the required stringency of fecundity style may certainly be problematic 11 when studying oocyte size frequency distributions (OSFDs).…”

mentioning

confidence: 99%

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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Oocyte recruitment and fecundity type in fishes: Refining terms to reflect underlying processes and drivers

Cited by 31 publications

References 45 publications

Trade‐offs between life‐history traits in a coldwater fish in the Mediterranean Sea: the case of blue whiting Micromesistius poutassou

Trade‐offs between life‐history traits in a coldwater fish in the Mediterranean Sea: the case of blue whiting Micromesistius poutassou

Primary and secondary oocyte growth dynamics in anadromous semelparous Allis shad Alosa alosa

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

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