The concept of fecundity regulation in plaice (<i>Pleuronectes platessa</i>) tested on three Irish Sea spawning populations

Kennedy, James; Witthames, Peter R.; Nash, Richard D.M.

doi:10.1139/f07-034

Cited by 59 publications

(71 citation statements)

References 41 publications

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“…There was no difference in fecundity between 1997 and 1998, this could be due to the fact that in some species fecundity differences only become apparent late in ovary maturation (Kennedy et al, 2007). This is because fecundity is strongly influenced by body weight during oocyte recruitment and early vitellogenesis resulting in no differences in a body size-fecundity relationship.…”

Section: Discussionmentioning

confidence: 96%

“…It is also common for weight to be a better predictor of fecundity than length (Koops et al, 2004;Kennedy et al, 2007). However, the mechanisms as to why weight or length provides the best predictor are poorly understood.…”

Section: Discussionmentioning

confidence: 99%

“…This is opposed to determinate spawners which recruit a batch of oocytes to the developing pool and then there is no more recruitment until the next maturity cycle (Hunter et al, 1992). It is now known that the fecundity in determinate spawners is not fixed but subject to down-regulation (Kurita et al, 2003;Thorsen et al, 2006;Kennedy et al, 2007). Downregulation is a process in which the fecundity is reduced to match the energy and/or food availability of the fish (Kjesbu and Witthames, 2007;Kennedy et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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When to count your eggs: Is fecundity in Greenland halibut (Reinhardtius hippoglossoides W.) down-regulated?

Kennedy

Gundersen

Boje³

2009

Fisheries Research

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Fecundity in several fish species is subject to down-regulation by atresia so if fecundity is estimated many months before spawning, this will be an overestimation of the realised fecundity (actual number of eggs spawned). In order to get accurate measurements of fecundity it is important to have knowledge on when potential fecundity (estimated fecundity at time of sampling) closely resembles the realised fecundity. Down-regulation of fecundity for Greenland halibut (Reinhardtius hippoglossoides W.) was assessed using fish caught off East Greenland 1998, 1999 and 2000. The fish caught in 1998 and 1999 were in an early and late stage of vitellogenesis respectively of the same maturation cycle. The fish caught in 2000 were also at an early stage of vitellogenesis. Fecundity decreased by 43% between early and late vitellogenesis. Fecundity in 1999 appeared to be the second lowest recorded for Greenland halibut but it is believed to be due to developmental stage rather than low productivity. There was no difference in fecundity between 1997 and 1998. It is believed that differences in fecundity between years only become apparent in late maturation as size during oocyte recruitment has a very large influence on fecundity. Neither Fulton's condition nor hepatosomatic index had any significant influence on fecundity.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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When to count your eggs: Is fecundity in Greenland halibut (Reinhardtius hippoglossoides W.) down-regulated?

Kennedy

Gundersen

Boje³

2009

Fisheries Research

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“…Little clutch-to-clutch size fluctuation is reported in ectotherms, but there is evidence for long-term plasticity cued by energy acquisition during the prespawning period when the gonads are developing. In many exploited marine species, for example, downregulation of fecundity is common as the spawning season approaches (Kennedy et al, 2007(Kennedy et al, , 2008(Kennedy et al, , 2009, and is likely an adaptive adjustment of spawning season fecundity to match nutrient levels.…”

Section: Clutch Sizementioning

confidence: 99%

Life-history plasticity in female threespine stickleback

et al. 2015

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The postglacial adaptive radiation of the threespine stickleback fish (Gasterosteus aculeatus) has been widely used to investigate the roles of both adaptive evolution and plasticity in behavioral and morphological divergence from the ancestral condition represented by present-day oceanic stickleback. These phenotypes tend to exhibit high levels of ecotypic differentiation. Population divergence in life history has also been well studied, but in contrast to behavior and morphology, the extent and importance of plasticity has been much less well studied. In this review, we summarize what is known about life-history plasticity in female threespine stickleback, considering four traits intimately associated with reproductive output: age/size at maturation, level of reproductive effort, egg size and clutch size. We envision life-history plasticity in an iterative, ontogenetic framework, in which females may express plasticity repeatedly across each of several time frames. We contrast the results of laboratory and field studies because, for most traits, these approaches give somewhat different answers. We provide ideas on what the cues might be for observed plasticity in each trait and, when possible, we inquire about the relative costs and benefits to expressed plasticity. We end with an example of how we think plasticity may play out in stickleback life history given what we know of plasticity in the ancestor.

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“…Downregulation likely occurs to some extent in all ovaries (Kjesbu 2009), but is accelerated in fish in poor condition (e.g. Kjesbu et al 1991, Kennedy et al 2007). We only found partial support for the latter explanation in the present study.…”

Section: Fecundity Regulationmentioning

confidence: 99%

Liver energy, atresia and oocyte stage influence fecundity regulation in Northeast Arctic cod

Skjæraasen¹,

Nash²,

Kennedy³

et al. 2010

Mar. Ecol. Prog. Ser.

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Marine ecosystems are changing; global warming-induced increases in water temperatures and fishing have caused truncated age structures and small sizes at maturity in many stocks. This may affect both populations' total reproductive output and the link between population demography and recruitment, yet detailed information on fecundity regulation is generally lacking for marine fishes. We therefore examined associations between liver energy, oocyte stage, leading cohort oocyte size (LC 20 ), atresia and fecundity for the Northeast Arctic cod (NEAC) Gadus morhua L. from 2006 to 2008 in a comprehensive field and laboratory study. The relationship between the relative liver size (hepatosomatic index, HSI ) and specific liver energy content was best described by an asymptotic curve, increasing rapidly at first, then levelling of at HSI > 6%. LC 20 increased towards the spawning season, but was also positively associated with total length. At present there is thus a tendency towards larger NEAC females spawning earlier. The incidence of atresia was highest during the advanced yolk granule stage. Only 1% of females that reached an LC 20 > 300 μm absorbed all oocytes and thereby aborted spawning. Potential fecundity showed a parabolic relationship with LC 20 , peaking around 614 μm, i.e. approximately on February 1st, and was positively associated with weight, liver energy and, presently, age. In summary, NEAC females that start vitellogenesis will likely spawn. Atresia and fecundity down-regulation appears only to become pronounced close to spawning. Finally, the size-dependent spawning time, which appears to have emerged in the stock recently, may alter the link between population demography and recruitment.KEY WORDS: Gadus morhua · Fecundity regulation · Atresia · Liver energy · Size-dependent spawning time Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 404: [173][174][175][176][177][178][179][180][181][182][183] 2010 Marine ecosystems are also changing in ways that may affect allocation patterns. Fishing has severely depleted commercial stocks (Hutchings & Reynolds 2004), and common denominators of contemporary stocks are a truncated age structure and smaller size at maturity compared to historic data (Trippel et al. 1997, Marteinsdottir & Thorarinsson 1998, Murawski et al. 2001. Although the importance of an in-depth understanding of the biological processes affecting maturation and thereby indirectly recruitment is acknowledged, essential information is lacking for most marine species.In terms of fecundity styles, fish can be broadly distinguished into 2 categories: indeterminate and determinate spawners (Hunter et al. 1992, Murua & Saborido-Rey 2003. Indeterminate spawners recruit new oocytes throughout the spawning period, whereas determinate spawners recruit a finite number of oocytes to the maturing pool prior to spawning. For fish employing the latter strategy, such as the batchspawning Atlantic cod Gadus morhua L., only a downregulation of potent...

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The concept of fecundity regulation in plaice (Pleuronectes platessa) tested on three Irish Sea spawning populations

Cited by 59 publications

References 41 publications

When to count your eggs: Is fecundity in Greenland halibut (Reinhardtius hippoglossoides W.) down-regulated?

When to count your eggs: Is fecundity in Greenland halibut (Reinhardtius hippoglossoides W.) down-regulated?

Life-history plasticity in female threespine stickleback

Liver energy, atresia and oocyte stage influence fecundity regulation in Northeast Arctic cod

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