Age and growth of redfish (Sebastes marinus, S. mentella, and S. fasciatus) on the Flemish Cap (Northwest Atlantic)

Saborido-Rey, Fran; Garabana, Dolores; Cerviño, Santiago

doi:10.1016/j.icesjms.2003.11.003

Cited by 30 publications

(23 citation statements)

References 11 publications

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“…Bomb radiocarbon is well established as an effective method of age validation for long-lived species, often with a precision of as little as 1-2 years (Kalish 1993;Campana 2001). Given that two previous radiochemical studies have confirmed the overall accuracy of C&B preparations and sections for determining the age of S. mentella and S. marinus in the Atlantic (albeit with low precision; Campana et al 1990;Stransky et al 2005a), and in light of another two studies that have confirmed the accuracy of these methods for ageing S. mentella to an age of 10 years (Mayo et al 1981;Saborido-Rey et al 2004), the bomb radiocarbon results in the present study were initially puzzling. The consistent offset of 9 years between the NWA reference chronology and the redfish core chronology indicates that either our growth increment counts were underaged by 9 years in every fish that we aged or the NWA surface marine chronology was inappropriate for use on Sebastes spp.…”

Section: Discussionmentioning

confidence: 93%

“…Few other studies have attempted to compare the growth of these two Sebastes species, in part because of their problematic species identification. In comparing the growth and longevity of S. fasciatus, S. mentella and S. marinus on the Flemish Cap, Saborido-Rey et al (2004) commented on the difficulty of distinguishing between the first two species, but then neglected to state how they identified the species. They concluded that S. marinus grew fastest, S. mentella grew slowest and that longevities ranged from 32 to 34 years for S. mentella and S. fasciatus (Table 3).…”

Section: Discussionmentioning

confidence: 99%

“…The accuracy of the C&B method has been validated in two independent radiometric studies (Campana et al 1990;Stransky et al 2005a). Nevertheless, growth parameters reported in different studies have varied widely, in part because of the difficulty of distinguishing among the three redfish species Sebastes marinus, S. mentella and S. fasciatus (Saborido-Rey et al 2004). As a result, it has been difficult to know whether there are real differences in growth trajectories among regions and species, or whether the reported differences are due to differences in otolith interpretation or errors in species identification.…”

Section: Introductionmentioning

confidence: 99%

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Image-enhanced burnt otoliths, bomb radiocarbon and the growth dynamics of redfish (Sebastes mentella and S. fasciatus) off the eastern coast of Canada

Campana

Valentin

MacLellan

et al. 2016

Mar. Freshwater Res.

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Abstract. Many past attempts to age deep-water redfish (Sebastes mentella) and Acadian redfish (S. fasciatus) in the north-west Atlantic have been stymied by inappropriate ageing methods, the absence of age validation and the failure to differentiate among species. Herein we report substantial improvements in methods for ageing Sebastes spp. by linking the established 'crack and burn' method to modern sectioning and image-enhancement protocols. Bomb radiocarbon assays of the otolith core and monitoring of year-class progression confirmed the accuracy of the resulting age determinations to an age of 46 years. The use of microsatellite DNA to confirm species identity eliminated past confusion caused by species mixtures. Age determinations of 1252 redfish from the eastern coast of Canada demonstrated the presence of significant differences in growth rate and longevity both between the two redfish species and among populations and stocks, with a maximum observed longevity of 70 years. Even within species and stocks, an individual fish with a fork length of 38 cm could be anywhere between 15 and 50 years of age, highlighting a near cessation of somatic growth after sexual maturation. In keeping with other deep-water species, sustainable management will require more attention to the low productivity expected of redfish stocks, rather than the high initial biomass that can support short-term but high catch rates.Additional keywords: age validation, annuli, break and burn, 14 C, false check.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Image-enhanced burnt otoliths, bomb radiocarbon and the growth dynamics of redfish (Sebastes mentella and S. fasciatus) off the eastern coast of Canada

Campana

Valentin

MacLellan

et al. 2016

Mar. Freshwater Res.

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“…Several studies have described the biology and ecology of Flemish Cap fish species (Rodríguez-Marín et al, MS 1994;Rodríguez-Marín and De Cárdenas, MS 1997;Saborido-Rey and Junquera, 1999 a,b;Murua, MS 2000;Saborido-Rey, MS 2001;Alpoim et al, MS 2002). Most previous works concerned single species and speciesspecific spatial distributions, population dynamics or biology.…”

Section: Introductionmentioning

confidence: 99%

Persistence and variation in the distribution of bottom-trawl fish assemblages over the Flemish Cap

Gronzález-Troncoso¹,

Paz²,

Cardoso³

2006

J. Northw. Atl. Fish. Sci.

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The aim of this study is to test the variability of the assemblages defined in the Flemish Cap area. Data from 951 bottom hauls were analysed, covering depths between 126 and 740 m in the years 1995-2002. The fish fauna in Flemish Cap appears distributed in a persistent structural zonation defined in three assemblages. The first three factors of a Principal Component Analysis explained the 78.4% of the variance in distribution species, and they are consistent with the results of a cluster analysis. The three characteristic assemblages show a temporal persistence, but some changes appear in this period, for instance: displacements of the assemblages limits towards shallower waters, and some changes in relative position of the dominant species in each assemblage. These changes can be related with the constant decrease of the biomass of the main demersal fish species like Atlantic cod and American plaice. The species of Genus Sebastes appear as dominant fish species in the area.

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“…Between-sex differences in growth were tested using the Chow test (Chow, 1960;Saborido-Rey et al, 2004).…”

Section: Age Determination and Growth Calculationmentioning

confidence: 99%

Reproductive strategy of common dentex Dentex dentex: management implications

et al. 2016

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Common dentex Dentex dentex is an iconic endangered species in the Mediterranean where is a sought after target species for small-scale, recreational and spearfishing fisheries. The reproductive biology of D. dentex in the natural environment is poorly known; therefore the reproductive strategy of the species was assessed by combining reproductive traits with the growth characteristics (estimated from length-at-age data), the size/age of sexual maturity and the energetic dynamics. A total of 358 wild fish were sampled on Mallorca Island (W Mediterranean) from March 1996 to June 1999 with a 19 to 84.7 cm total length (LT) range. The sex ratio was skewed towards females (1.361) albeit the length composition was not different between sexes (p = 0.551). Three young immature individuals (< 28 cm LT, 0.8% individuals) were rudimentary hermaphrodites supporting the late gonochoristic species classification. The age composition determined from sagitta otolith interpretation ranged from 0 to 26 years (yr). Concerning growth, between sex differences in von Bertalanffy parameters were not relevant, even after accounting for potential between-year differences. The most noticeable difference was found for L∞ (64.7 cm for females versus 61.6 for males) but even in this case, the bayesian credibility interval of between-sex differences included zero. Maturity ogives at size and age showed that females achieved 50% maturity at 34.9 cm LT and 3.3 years, while males did at 33.8 cm LT and 2.5 years. The onset of gonad developing phase took place in December, while it progresses until April. The spawning peak was in April and May for both sexes. A generalized linear model showed that female size didn’t affect significantly the spawning season, whilst there was a strong seasonality in the spawning. Most of the evidences showed that fecundity is likely determinate, with an asynchronous oocyte development before spawning and a clear ovarian bimodal organization after the onset of spawning. Female weight explained 84% of the observed variance for fecundity. The gonadosomatic, hepatosomatic and condition indexes varied significantly with the reproductive season for females and only the gonadosomatic index for males. Storage in muscle seemed to be the primary source of energy for reproduction, although liver appeared to play a short-term role in egg production, suggesting a combination of capital and income breeding. The results indicate that the life history strategy of common dentex possess consist on maturing well before reaching maximum size, investing in growth after maturation, and therefore the reproductive effort is distributed through a longer lifespan and related with the size attained after maturation. At present no management measures are directed to D. dentex; given its life history strategy we suggest that a slot limit should be implemented, i.e. a minimum and a maximum landing size, with a minimum size of 35 cm. The upper threshold, to protect the higher reproductive potential of older and larger fish, should still be defined.

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Age and growth of redfish (Sebastes marinus, S. mentella, and S. fasciatus) on the Flemish Cap (Northwest Atlantic)

Cited by 30 publications

References 11 publications

Image-enhanced burnt otoliths, bomb radiocarbon and the growth dynamics of redfish (Sebastes mentella and S. fasciatus) off the eastern coast of Canada

Image-enhanced burnt otoliths, bomb radiocarbon and the growth dynamics of redfish (Sebastes mentella and S. fasciatus) off the eastern coast of Canada

Persistence and variation in the distribution of bottom-trawl fish assemblages over the Flemish Cap

Reproductive strategy of common dentex Dentex dentex: management implications

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