Age and growth of black scabbardfish (&lt;i&gt;Aphanopus carbo&lt;/i&gt; Lowe, 1839) in the southern NE Atlantic

Vieira, Alberto; Farias, Inês; Figueiredo, Ivone; Neves, Ana; Morales‐Nin, Beatriz; Sequeira, Vera; Martins, Rogélia; Gordo, Leonel Serrano

doi:10.3989/scimar.2009.73s2033

Cited by 22 publications

(22 citation statements)

References 32 publications

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“…Figure 3 represents the growth curves according to sex for all available studies, restricted to the length range of each fish sample. Growth estimates from Vieira et al (2009) and Delgado et al (2013) seem to be in agreement, without any meaningful area effect. Ageat-length from Kelly et al (1998) was consistently higher than in all the other studies.…”

Section: Fisheriesmentioning

confidence: 77%

“…Nonetheless, in the results of Vieira et al (2009) the absence of small individuals caught off Madeira may have interfered with the accuracy of the growth parameter estimates. In contrast, slow growth rate is observed for adults, as a result of a transfer of energy investment from growth to reproduction (Lika and Nisbet 2000).…”

Section: Fisheriesmentioning

confidence: 99%

“…Therefore, all females larger than the length at first maturity are expected to mature and spawn simultaneously. Assuming that the age at maturity is approximately 6.5 years (after Figueiredo et al 2003 andVieira et al 2009) and that the oldest specimens found were 14 years old Delgado et al 2013), females are expected to be able to spawn for a period of 8 years. However, the presence of nonreproductive adults mixed with spawning adults in Madeira during the spawning period suggests that skipped spawning may occur in this species Ribeiro Santos et al 2013a).…”

Section: Reproductionmentioning

confidence: 99%

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Black scabbardfish,Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle

Farias

Morales‐Nin

Lorance

et al. 2013

Aquat. Living Resour.

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-The biology, ecology, and dynamics of the deep-sea teleost black scabbardfish in the northeast Atlantic are reviewed. The black scabbardfish is a commercial bathypelagic species found in the NE Atlantic mostly from Iceland to the Canary Islands and Western Sahara, at depths from 800 to 1300 m. The spatial structure of its population is still uncertain, although the existence of one single stock that migrates around the NE Atlantic driven by feeding and reproduction is the most likely hypothesis consistent with available data. This review is based on data from commercial fisheries off the Faroe Islands, Hatton Bank, the west of the British Isles, and Portugal (mainland, Azores, and Madeira) and from Icelandic and Scottish scientific surveys collected between 1988 and 2012. Spawning of black scabbardfish occurs around Madeira and the Canary Archipelagos during the last quarter of the year. According to the migratory hypothesis, eggs, larvae, and possibly juveniles move north to areas from south of Icelandic and Faroe Islands to the west of the British Isles where they remain for some years to feed and grow. Then, they move south to the area off mainland Portugal, where they reach the size of first maturity but do not reproduce, and later move further south to the spawning grounds. Further studies are needed to understand which of the environmental conditions prevailing around Madeira and the Canaries, but not elsewhere, allow this species to mature and subsequently reproduce. This review suggests that a multidisciplinary approach is required to confirm the spatiotemporal migration and habitats used by black scabbardfish populations in the NE Atlantic at different life stages. Otolith contour shape and microchemistry, fatty acids, carbon and nitrogen stable isotopes, as well as steroid hormones are proposed as promising alternative tools for responding to this challenge.

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Section: Fisheriesmentioning

confidence: 77%

Section: Fisheriesmentioning

confidence: 99%

Section: Reproductionmentioning

confidence: 99%

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Black scabbardfish,Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle

Farias

Morales‐Nin

Lorance

et al. 2013

Aquat. Living Resour.

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“…Fish age can usually be estimated using the periodicity of the formation of growth increments in calcified hard structures, such as scales, otoliths, fin rays and vertebrae (Wright et al 2002). However, otoliths are the structures preferred by fisheries scientists because of (i) the precision of age estimates based on annuli; (ii) the relative ease of otolith preparation and annuli enumeration; (iii) the lack of reabsorption (the mineral deposited is not used again, even in periods of starvation); and (iv) the continuous growth of otoliths throughout the lifetime of the fish (Bergstad 1995, Mendonza 2006, Vieira et al 2009). In addition to age and growth determination, otoliths have also been studied in many different fields, such as fish biology (hearing and balance in fishes), larval fish ecology, species identification, fish stock identification and environmental reconstruction of fish habitats (Mendonza 2006).…”

Section: Introductionmentioning

confidence: 99%

Age, growth and mortality of <i>Pontinus kuhlii</i> (Bowdich, 1825) (Scorpaeniformes: Scorpaenidae) in the Gorringe, Ampère, Unicorn and Lion seamounts

Paiva¹,

Neves²,

Sequeira³

et al. 2013

Sci. Mar.

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SUMMARY: Age and growth of Pontinus kuhlii were studied using otoliths of 153 males and 148 females, with males having a greater length (and age) than females. A high level of agreement was achieved among readers. Due to gear selectivity, only ages above 7 years (males) and 8 years (females) were estimated in whole otoliths. To estimate length-at-age in younger specimens, backcalculation was also considered but its use in otoliths with ages greater than 22 years was not possible because the growth rings were too close to each other. Von Bertalanffy growth parameters were estimated by sex using each of these methods and also using an approach that combines mean length-at-age obtained from backcalculation and direct reading on the otoliths. The likelihood ratio test showed significant differences between sexes in the three approaches and Akaike's information criterion suggests that the backcalculation approach was the best one for describing P. kuhlii growth: TL=38.89[1-e (-0.07(t+1.96)) ] and TL=56.50[1-e (-0.04(t+1.87)) ] for females and males, respectively. Natural mortality estimates varied around 0.15 year -1 and 0.07 year -1 for females and males, while the total mortality estimated for 2011 was 0.33 year -1 for females and 0.21 year -1 for males.Keywords: Pontinus kuhlii, offshore rockfish, whole otoliths, precision estimators, age and growth, Scorpaenidae, mortality. RESUMEN: Edad, crEcimiEnto y mortalidad dE Pontinus kuhlii (Bowdich, 1825) (ScorpaEniformES: ScorpaEnidaE) En loS montES SuBmarinoS dE GorrinGE, ampèrE, unicorn y lion. -La edad y crecimiento de Pontinus kuhlii se ha estudiado a partir de otolitos de 153 machos y 148 hembras, alcanzando los machos una talla mayor (y edad) que las hembras. Un alto nivel de acuerdo fue alcanzado entre los lectores. Debido a la selectividad del arte de pesca, sólo las edades de más de 7 años (machos) y 8 años (hembras) pudieron ser estimadas en otolitos enteros. Para la estimación de la talla por edad en los ejemplares más jóvenes, el retrocálculo también fue considerado, pero su uso en los otolitos con edades mayores de 22 años no fue posible, ya que los anillos de crecimiento se encontraban demasiado cerca unos de los otros. Los parámetros de crecimiento, ajustados a la ecuación de Von Bertalanffy, fueron estimados por sexo con ambos métodos, y también a partir de otro que combina la talla media por grupo de edad obtenida a partir del retrocálculo y de la lectura directa en los otolitos. La prueba de máxima verosimilitud mostró diferencias significativas entre sexos en los tres métodos y el criterio Akaike de información sugiere que el retrocálculo fue el mejor para describir el crecimiento de P. kuhlii: TL=38.89[1-e (-0.07(t+1.96)) ] y TL=56.50[1-e (-0.04(t+1.87)) ] para las hembras y machos, respectivamente. La estimación de la mortalidad natural varió entre 0.15 año -1 y 0.07 año -1 para hembras y machos, mientras que la mortalidad total estimada para 2011 fue de 0.33 año -1 para las hembras y 0.21 año -1 para los machos.Palabras clave: Pontinus kuhlii, rasc...

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“…There are differences between taxonomic groups, with elasmobranchs being intrinsically more vulnerable to fishing than teleosts, and differences within taxonomic groups, resulting in the more vulnerable teleosts such as orange roughy and roundnose grenadier receiving similar scores to the more productive elasmobranch species Etmopterus spinax. Note that for black scabbardfish, the most conservative life history parameters were selected (Kelly et al 1998) although all other studies suggest shorter longevity and faster growth Pajuelo et al 2008;Vieira et al 2009;Delgado et al 2013). As shown by a metaanalysis on the life history traits of deepwater species (Drazen and Haedrich 2012), the least productive species within each taxonomic group were the ones inhabiting the deeper depth zones.…”

Section: Discussionmentioning

confidence: 99%

Assessing the risk of vulnerable species exposure to deepwater trawl fisheries: the case of orange roughyHoplostethus atlanticusto the west of Ireland and Britain

Dransfeld

Gerritsen

Hareide

et al. 2013

Aquat. Living Resour.

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-With slow growth rates, late maturity and a high maximum age of 100 years or more, orange roughy can be classified as a vulnerable deepwater fish species that can only sustain low rates of exploitation. Historical patterns of exploitation associated with this species suggest that it is currently not possible to manage its fisheries in the Northeast Atlantic sustainably, and the total allowable catch for orange roughy has been gradually reduced to zero for European fisheries since 2010. Orange roughy to the west of Ireland and Britain occurs on distinct bathymetric features (seamounts, hills and canyons) as well as on flat ground along the continental slope. Productivity-susceptibility analysis (PSA) was performed to evaluate the biological vulnerability of orange roughy in relation to other deepwater species and the risk that recent and current fisheries pose to its populations in the study area. Time-dependant PSA, based on the spatial overlap between orange roughy distribution and recent and current deepwater fisheries demonstrated a strong reduction in risk over time when fisheries stopped directed targeting practices and continued with mixed deepwater trawl fisheries. Some spatial overlap between the species and current fisheries remains, and while the method can show relative risk reduction, it cannot provide information on whether the risk is low enough to allow the recovery of depleted populations.

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Age and growth of black scabbardfish (<i>Aphanopus carbo</i> Lowe, 1839) in the southern NE Atlantic

Cited by 22 publications

References 32 publications

Black scabbardfish,Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle

Black scabbardfish,Aphanopus carbo, in the northeast Atlantic: distribution and hypothetical migratory cycle

Age, growth and mortality of <i>Pontinus kuhlii</i> (Bowdich, 1825) (Scorpaeniformes: Scorpaenidae) in the Gorringe, Ampère, Unicorn and Lion seamounts

Assessing the risk of vulnerable species exposure to deepwater trawl fisheries: the case of orange roughyHoplostethus atlanticusto the west of Ireland and Britain

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