Variability in total egg production and implications for management of the southern stock of European hake

Méhault, Sonia; Domínguez-Petit, Rosario; Cerviño, Santiago; Saborido-Rey, Fran

doi:10.1016/j.fishres.2010.03.019

Cited by 63 publications

(78 citation statements)

References 42 publications

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“…Therefore, it is reasonable to assume that reproductive potential of Argentine Hake may be affected by the liver condition of spawning females. Positive relationships between DW and the variables of TL, GW, and age were observed for Argentine Hake-results that coincide with previous studies of this species (Macchi et al, 2006), and for European Hake (Mehault et al, 2010). Moreover, the positive relationship between DW and fecundity indicates that larger females of Argentine Hake invest energy in both the quantity and quality of the oocytes that they produce.…”

Section: A B C D Esupporting

confidence: 88%

“…It has been shown that the reproductive potential of a fi sh stock is strongly infl uenced by the size and age of spawning females. During the reproductive season, older and larger individuals produce more oocytes than younger and smaller spawners because fecundity and spawning frequency are higher in larger females and, in general, their reproductive period is longer than the period of smaller spawners (Marshall et al, 1998;Marteinsdottir and Thorarinsson, 1998;Marteinsdottir and Begg, 2002;Macchi et al, 2004;Mehault et al, 2010). Therefore, variation in length composition of a fi sh stock caused by fi shing activity or by other sources of mortality would affect the number of eggs spawned at a population level.…”

Section: Maternal Effects On Fecundity and Egg Quality Of The Patagonmentioning

confidence: 99%

“…The DW of each of these samples was considered an index of egg quality for the spawning females of Argentine Hake collected during the 2 research cruises because, in general, dry mass is associated with the quantity of yolk reserves stored in oocytes (Macchi et al, 2006;Mehault et al, 2010). The relationships between DW and the different morphophysiological variables (TL, GW, age, HSI, and Kn), on the basis of length, weight, or organ-body weight ratios, were evaluated with simple regression analysis as were the fecundity data.…”

Section: Egg Qualitymentioning

confidence: 99%

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Maternal effects on fecundity and egg quality of the Patagonian stock of Argentine Hake (Merluccius hubbsi)

Macchi¹,

Leonarduzzi²,

Diaz³

et al. 2013

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Abstract-The influences of age, size, and condition of spawning females on fecundity and oocyte quality were analyzed for the Patagonian stock of Argentine Hake (Merluccius hubbsi). Samples of mature females were collected in the spawning area as part of 2 research surveys conducted in January 2010 and 2011, during the peak of the reproductive season. Batch fecundity (BF) ranged between 40,500 (29 cm total length [TL]) and 2,550,000 (95 cm TL) hydrated oocytes, and was positively correlated with TL, gutted weight, age, hepatosomatic index (HSI), and the relative condition factor (Kn). Relative fecundity ranged between 85 and 1040 hydrated oocytes g -1 and showed significant positive relationships with gutted weight, HSI, and Kn; however, coefficients of determination were low for all regressions. Dry weights of samples of 100 hydrated oocytes ranged between 1.8 and 3.95 mg and were positively correlated with all variables analyzed, including batch and relative fecundity. Multiple regression models created with data of the morphophysiological characteristics of females supported maternal influences on fecundity and egg weights. Within the studied size range (29-95 cm TL), larger individuals had better somatic and egg condition, mainly revealed by higher HSI and hydrated oocytes with larger oil droplets (275.71µm [standard error 1.49]). These results were associated with the higher feeding activity of larger females during the spawning season in comparison with the feeding activity of young individuals (<5 years old); the better nutritional state of larger females, assumed to result from more feeding, was conducive to greater production of high-quality eggs.

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Section: A B C D Esupporting

confidence: 88%

Section: Maternal Effects On Fecundity and Egg Quality Of The Patagonmentioning

confidence: 99%

Section: Egg Qualitymentioning

confidence: 99%

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Maternal effects on fecundity and egg quality of the Patagonian stock of Argentine Hake (Merluccius hubbsi)

Macchi¹,

Leonarduzzi²,

Diaz³

et al. 2013

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“…The dominance of M. poutassou was expected because this study was carried out during the relatively short (February−March) but intense spawning period of this species off the Iberian coasts (Whitehead et al 1984-1986, Rodriguez 2008. This study also coincided with the main spawning period of M. merluccius in the region (Mehault et al 2010) and with the beginning of the spawning period of S. scombrus in the NE Atlantic (Whitehead et al 1984(Whitehead et al -1986. This is supported by the fact that all S. scombrus larvae were collected at the very end of the cruise and by their average size (2.7 mm), which corresponds to lecithotrophic larvae (Russell 1976).…”

Section: Lfcmentioning

confidence: 70%

Composition and structure of the larval fish community in the NW Iberian upwelling system during the winter mixing period

Rodrı́guez

Cabrero²,

Gago³

et al. 2015

Mar. Ecol. Prog. Ser.

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The composition and structure of the larval fish community (LFC) in the NW Iberian upwelling system in late winter 2012 were examined, and the influence of abiotic and biotic factors on the horizontal distribution of fish larvae and on the horizontal structure of the LFC was investigated. The LFC, composed of 62 taxa (59 species and 3 genera) in 28 families, was dominated by Micromesistius poutassou followed by Scomber scombrus, Merluccius merluccius and Maurolicus muelleri. Multivariate analyses identified depth, sea surface temperature, geostrophic velocity and mesozooplankton biomass as the environmental factors involved in explaining variability in the LFC parameters (larval fish abundance, species richness and diversity) and revealed that the LFC was structured into coastal and slope larval fish assemblages. The main factor defining these assemblages was depth. However, the unusual coastal downwelling that occurred during the study would have participated in creating them and in maintaining assemblage boundaries, so that the importance of depth to the cross-shelf structuring of the LFC may have been overestimated. Our results suggest that larval fish assemblages in regions of coastal upwelling are driven by coastal downwelling during the winter mixing period and support the idea that fish larvae act as short-term (~10 d) biological tracers of the hydrography of the region during that period.

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“…This has already been shown to be true empirically (e.g. Marshall et al 2006, Mehault et al 2010. It is therefore of interest to follow the impact of b > 1 on biological reference points, similar to the analysis done by Spencer et al 2007.…”

Section: Relative Fecundity and Links To Reference Pointsmentioning

confidence: 70%

Report of the Workshop on Implementation of Stock Reproductive Potential into Assessment and Management Advice for Harvested Marine Species

Morgan¹,

Marshall²,

O’Brien³

et al. 2012

NAFO Sci. Coun. Studies

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Variability in total egg production and implications for management of the southern stock of European hake

Cited by 63 publications

References 42 publications

Maternal effects on fecundity and egg quality of the Patagonian stock of Argentine Hake (Merluccius hubbsi)

Maternal effects on fecundity and egg quality of the Patagonian stock of Argentine Hake (Merluccius hubbsi)

Composition and structure of the larval fish community in the NW Iberian upwelling system during the winter mixing period

Report of the Workshop on Implementation of Stock Reproductive Potential into Assessment and Management Advice for Harvested Marine Species

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