Applied Fisheries Reproductive Biology: Contribution of Individual Reproductive Potential to Recruitment and Fisheries Management

Kjesbu, Olav Sigurd

doi:10.1002/9781118752739.ch8

Cited by 12 publications

(8 citation statements)

References 153 publications

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“…Observed fecundity is probably the most widely used indicator of reproductive fitness in recruitment studies (Grazer & Martin, 2012; Kjesbu, 2016). Throughout the reproductive cycle, fecundity may be reduced by atresia, that is, so‐called “down‐regulation”, or dynamically increased due to de novo recruitment of developing oocytes (Kjesbu, 2016). Under global warming and increasing atresia, lowered fecundity could be expected.…”

Section: Elevated Temperature and Female Fish: From Oogenesis To Egg mentioning

confidence: 99%

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

Alix

Kjesbu

Anderson

2020

Journal of Fish Biology

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Ambient temperature modulates reproductive processes, especially in poikilotherms such as teleosts. Consequently, global warming is expected to impact the reproductive function of fish, which has implications for wild population dynamics, fisheries and aquaculture. In this extensive review spanning tropical and cold‐water environments, we examine the impact of higher‐than‐optimal temperatures on teleost reproductive development and physiology across reproductive stages, species, generations and sexes. In doing so, we demonstrate that warmer‐than‐optimal temperatures can affect every stage of reproductive development from puberty through to the act of spawning, and these responses are mediated by age at spawning and are associated with changes in physiology at multiple levels of the brain–pituitary–gonad axis. Response to temperature is often species‐specific and changes with environmental history/transgenerational conditioning, and the amplitude, timing and duration of thermal exposure within a generation. Thermally driven changes to physiology, gamete development and maturation typically culminate in poor sperm and oocyte quality, and/or advancement/delay/inhibition of ovulation/spermiation and spawning. Although the field of teleost reproduction and temperature is advanced in many respects, we identify areas where research is lacking, especially for males and egg quality from “omics” perspectives. Climate‐driven warming will continue to disturb teleost reproductive performance and therefore guide future research, especially in the emerging areas of transgenerational acclimation and epigenetic studies, which will help to understand and project climate change impacts on wild populations and could also have implications for aquaculture.

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Section: Elevated Temperature and Female Fish: From Oogenesis To Egg mentioning

confidence: 99%

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

Alix

Kjesbu

Anderson

2020

Journal of Fish Biology

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“…Studies within applied fish reproductive biology have mostly targeted advanced developing oocytes, i.e. primarily VOs or FOM/HO (hydrated oocytes), when aiming at studying temporal and/or spatial fecundity dynamics 9 , 13 , 14 . However, over the recent years, several studies have pointed at the importance of focusing on the actual PVO production as well to better understand oocyte recruitment processes and thereby the underlying fecundity formation as such 10 , 13 , 21 , 24 , 25 , 28 , 29 .…”

Section: Discussionmentioning

confidence: 99%

“…PVO dynamics of mackerel mimics the one seen in another teleost warm-temperate, serial spawner, the European hake ( Merluccius merluccius ) 25 . Small oocytes, represented by phases PVO2 to PVO4b, were omnipresent constituting thereby “the reservoir of oocytes” 9 . However, our results contrasted in these respects with the finding of Greer-Walker et al 4 that the number of PVOs decline from October to January, then increase until June, indicating a typical feature of a determinate fecundity type.…”

Section: Discussionmentioning

confidence: 99%

“…One of the established criteria used to distinguish the fecundity type is the presence of a hiatus (or gap) in the oocyte size frequency distribution (OSFD) 4 , 6 . Formally, a clear hiatus should be found between previtellogenic (PVO) and vitellogenic oocytes (VO) in determinate spawners whereas being absent in indeterminate spawners 5 , 8 , 9 . This distinction may, however, be met with interpretation problems, e.g.…”

Section: Introductionmentioning

confidence: 99%

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First thorough assessment of de novo oocyte recruitment in a teleost serial spawner, the Northeast Atlantic mackerel (Scomber scombrus) case

Schmidt

Thorsén

Slotte

et al. 2021

Sci Rep

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The understanding of teleost fecundity type (determinate or indeterminate) is essential when deciding which egg production method should be applied to ultimately estimate spawning stock biomass. The fecundity type is, however, unknown or controversial for several commercial stocks, including the Northeast Atlantic mackerel (Scomber scombrus). Aiming at solving this problem, we applied state-of-the-art laboratory methods to document the mackerel fecundity type, including any de novo oocyte recruitment during spawning. Initially, active mackerel spawning females were precisely classified according to their spawning status. The number and size of all phasei-specific oocytes (12 phases), with a special attention to previtellogenic oocytes phases (PVO [PVO2 to PVO4a–c]), were also thoroughly investigated. Examinations of relative fecundity (RFi) clarified that the latest phase of PVOs (PVO4c) are de novo recruited to the cortical alveoli–vitellogenic pool during the spawning period, resulting in a dome-shaped seasonal pattern in RFi. Hence, we unequivocally classify mackerel as a true indeterminate spawner. As PVO4c oocytes were currently identified around 230 µm, mackerel fecundity counts should rather use this diameter as the lower threshold instead of historically 185 µm. Any use of a too low threshold value in this context will inevitably lead to an overestimation of RFi and thereby underestimated spawning stock biomass.

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“…Observed fecundity is probably the most widely used indicator of reproductive fitness in recruitment studies (Grazer & Martin, 2012;Kjesbu, 2016). Throughout the reproductive cycle, fecundity may be reduced by atresia, that is, so-called "down-regulation", or dynamically increased due to de novo recruitment of developing oocytes (Kjesbu, 2016). Under global warming and increasing atresia, lowered fecundity could be expected.…”

Section: Fecundity At Spawningmentioning

confidence: 99%

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

2021

Journal of Fish Biology

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Applied Fisheries Reproductive Biology: Contribution of Individual Reproductive Potential to Recruitment and Fisheries Management

Cited by 12 publications

References 153 publications

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

First thorough assessment of de novo oocyte recruitment in a teleost serial spawner, the Northeast Atlantic mackerel (Scomber scombrus) case

From gametogenesis to spawning: How climate‐driven warming affects teleost reproductive biology

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