Using a multi-parameter approach to reassess maturity of spiny dogfish, Squalus acanthias, following increased fishing pressure in the Western North Atlantic

Bubley, Walter J.; Sulikowski, James A.; Koester, David; Tsang, Patricia

doi:10.1016/j.fishres.2013.06.004

Cited by 18 publications

(16 citation statements)

References 45 publications

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“…On the Scotian shelf, the maximum L T varied between 1121 (females) and 957 mm (males) and the L T50 between 821 (females) and 635 mm (males) ). In the Gulf of Maine (Bubley et al, 2013), sizes at maturity were larger than those estimated in this study. On the other hand, female sexual maturity was attained at a similar size (760-880 mm) in the north-east Atlantic Ocean (Jones & Ugland, 2001).…”

Section: Discussioncontrasting

confidence: 81%

“…: +54 223 4862586; email: jcolonello@inidep.edu.ar 1759 The reproduction of S. acanthias has been studied throughout the world. There is considerable variation in population parameters, but in general, S. acanthias is lecithotrophic with slow growth Tribuzio et al, 2009;Bubley et al, 2013), a late age of sexual maturity Bubley et al, 2013), widespread low fertility and a complex reproductive cycle (Compagno, 1984;Hanchet, 1988;Jones & Ugland, 2001;Demirhan & Seyhan, 2007;Capapé & Reynaud, 2011). These features are common to many species of sharks and suggest a low reproductive potential and low intrinsic growth rate.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive and population parameters of spiny dogfish Squalus acanthias in the south‐western Atlantic Ocean

Colonello

Cortés

Belleggia

et al. 2016

Journal of Fish Biology

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The objective of this study was to estimate reproductive and population parameters of the spiny dogfish Squalus acanthias for the south-western Atlantic Ocean. In total, 2714 specimens (1616 males and 1098 females) were collected from surveys carried out using research vessels. Males ranged from 225 to 861 mm total length (LT ) and females from 235 to 925 mm LT . The size at maturity of females (651 mm) was significantly greater than that of males (565 mm). The maximum proportion of mature individuals (Pmax ) of the gestation ogive was <1, which indicates that a proportion of mature females was not in gestation. This inactivity may be explained by the occurrence of resting periods between cycles or by the asynchrony of the reproductive cycle. The estimated Pmax for the maternity ogive suggested that about one third of mature females were in the maternity stage (i.e. with embryos >156 mm). The temporal and spatial co-occurrence of non-gravid adult females at different stages of ovarian development, as well as gravid females at all embryonic development stages would indicate that the female reproductive cycle in the south-western Atlantic Ocean is asynchronous. The results indicate that S. acanthias is susceptible to fishing pressure on account of its length at maturity, extended reproductive cycles and low fecundity.

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Section: Discussioncontrasting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Reproductive and population parameters of spiny dogfish Squalus acanthias in the south‐western Atlantic Ocean

Colonello

Cortés

Belleggia

et al. 2016

Journal of Fish Biology

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“…This fishing strategy has resulted in a recent increase in the adult male:female sex ratio in the catch of this species and in a decrease in the average size at maturity for adult females in the U.S. Atlantic stock from the sizes reported by Nammack et al (1985) (Sosebee, 2005; Rago and Sosebee 4 )-a drop from 80 cm TL to about 74.5 cm TL, according to Bubley et al (2013). Overall, this decline indicates that the actual size at maturity of adult females from the NEAMAP surveys during 2007-2013 was likely to have been smaller than the 80 cm TL used in our analysis.…”

Section: Methodsmentioning

confidence: 98%

“…Bayesian approaches have several advantages over traditional methods and have been applied successfully to fisheries studies (Colloca et al, 2009;Muñoz et al, 2013;Pennino et al, 2014). Bayesian methods allow the inclusion of both the observed data and model parameters as random variables (Banerjee et al, 2004) and provide more realistic and accurate estimations of uncertainty (Pennino et al, 2014).…”

Section: Modeling Species Abundancementioning

confidence: 99%

“…However, most of the common applications do not always provide accurate results when run with traditional prediction methods (i.e., frequentist inference), often because of a large amount of spatiotemporal variability in the data that characterizes dynamic marine ecosystems (Roos et al, 2015). To account for this variability, we used hierarchical Bayesian spatiotemporal models in our study.Bayesian approaches have several advantages over traditional methods and have been applied successfully to fisheries studies (Colloca et al, 2009;Muñoz et al, 2013;Pennino et al, 2014). Bayesian methods allow the inclusion of both the observed data and model parameters as random variables (Banerjee et al, 2004) and provide more realistic and accurate estimations of uncertainty (Pennino et al, 2014).…”

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confidence: 99%

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Modeling the habitat distribution of spiny dogfish (Squalus acanthias), by sex, in coastal waters of the northeastern United States

Dell’Apa¹,

Pennino²,

Bonzek³

2016

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Abstract-A hierarchical Bayesian approach was used to model the spatiotemporal habitat distribution of spiny dogfish (Squalus acanthias) of both sexes (adults) caught during trawl surveys conducted by the Northeast Area Monitoring and Assessment Program in inshore coastal waters between New England and North Carolina during [2007][2008][2009][2010][2011][2012][2013]. The best model for predicting catch per unit of effort (CPUE) for this species includes the following relevant variables: bathymetry, sea surface temperature, salinity, chlorophyll-a (chl-a) concentration, season and time of survey, and a random spatial effect for both sexes. Predicted CPUE was related to depth for both sexes; females occurred in shallower waters than those in which males occurred. Also, more females than males were predicted to occur in warmer, less saline and more productive (higher chl-a concentration) waters. Seasonality and time of predicted CPUE indicated that the abundance of females was higher in inshore coastal waters in the spring and in the morning, and the abundance of males was greater in the afternoon and in the fall in the same area. Collectively, these results provide information that enhances our understanding of differences in habitat selection and spatiotemporal distribution of the 2 sexes of this species-information that can help to modify present management strategies for the U.S. Atlantic fishery.The spiny dogfish (Squalus acanthias) is a small shark commonly found in oceanic and coastal temperate waters throughout the world, at depths less than 900 m (Compagno et al., 2005;Dell'Apa et al., 2015). The species is sexually dimorphic; adult females, on average, are larger than adult males (Nammack et al., 1985). Moreover, aggregations of adult individuals are segregated by sex and size (Ford, 1921;Shepherd et al., 2002;Dell'Apa et al., 2014)-a common occurrence with elasmobranchs (Springer, 1967; Sims, 2005). Sexual segregation can be the effect of social segregation, in which the interaction between the sexes is limited by behavioral differences between the sexes, or it can be the effect of habitat segregation, in which the 2 sexes use habitats with different physical and environmental characteristics. Social segregation and habitat segregation can also occur simultaneously for the two sexes and can lead to differences in spatial distribution and habitat associations between the sexes (Wearmouth and Sims, 2008). Additionally, sexual dimorphism may influence feeding habits in live-bearing elasmobranchs (Sims, 2005), resulting in the 2 sexes having evolved specific physiological requirements that have led to differences in diet and prey preferences (Ruckstuhl and Clutton-Brock, 2005). Consequently, the 2 sexes may occupy different habitats characterized by different prey compositions and thus reduce intraspecific competition (Sims, 2005).For commercially important species, such as the spiny dogfish (Lack, 2006;Dell'Apa et al., 2013), predicting abundance and identifying habitat associations in response to enviro...

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Fecundity and Embryonic Development of Spiny Dogfish in the Northwest Atlantic Ocean

Dutton

Gioia

2018

Trans Am Fish Soc

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We investigated the fecundity and embryonic development of Spiny Dogfish Squalus acanthias (68.8-88.4 cm TL; n = 49) caught in the northwest Atlantic Ocean off Long Island, New York, between October 2014 and January 2015. Ovarian fecundity ranged from 0 to 6 eggs, whereas uterine fecundity ranged from 0 to 7 embryos. The average ovarian fecundity and uterine fecundity were equal at 4.1, and fecundity increased with maternal body length. All ovarian eggs and embryos in an individual female were at the same stage of development. Ovarian eggs (n = 200) ranged from 1.4 to 4.9 cm in diameter and weighed between 1.3 and 39 g. Embryos (n = 200) ranged from 8.6 to 27.5 cm TL and weighed between 2 and 74 g. The sex ratio of the embryos (female : male) was 1.17:1.00; however, within individual females, one sex dominated over the other. The development of ovarian eggs was concurrent with embryo development. The data collected in this study can be used in future stock assessments for the northwest Atlantic Spiny Dogfish population.

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Using a multi-parameter approach to reassess maturity of spiny dogfish, Squalus acanthias, following increased fishing pressure in the Western North Atlantic

Cited by 18 publications

References 45 publications

Reproductive and population parameters of spiny dogfish Squalus acanthias in the south‐western Atlantic Ocean

Reproductive and population parameters of spiny dogfish Squalus acanthias in the south‐western Atlantic Ocean

Modeling the habitat distribution of spiny dogfish (Squalus acanthias), by sex, in coastal waters of the northeastern United States

Fecundity and Embryonic Development of Spiny Dogfish in the Northwest Atlantic Ocean

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