Biological parameters of the bathyal fish black scabbardfish (Aphanopus carbo Lowe, 1839) off the Canary Islands, Central-east Atlantic

Pajuelo, José G.; González, Jorge Iván; Santana, J. I.; Nespereira, José María Lorenzo; García-Mederos, Antonio; Tuset, Víctor M.

doi:10.1016/j.fishres.2007.12.022

Cited by 31 publications

(46 citation statements)

References 21 publications

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“…Concerning the second possibility, new spawning areas have been found very recently in the Canary islands (Pajuelo et al, 2008) and near the northwest coast of Africa (Perera, 2008) in addition to Madeiran waters, the previously known spawning area of black scabbardfish (Figueiredo et al, 2003). therefore, it is possible that a spawning migration of the individuals with better condition may occur to one of these known areas in the southern northeast Atlantic.…”

Section: Discussionmentioning

confidence: 97%

“…however, mature individuals were only caught in Madeiran waters (Figueiredo et al, 2003) and, more recently, off the Canary islands (Pajuelo et al, 2008) and the northwest coast of Africa (Perera, 2008). Moreover, only two individuals with ripe gonads were cited by ehrich (1983) in Porcupine Bank and Magnússon and Magnússon (1995) found specimens in spent condition in icelandic waters.…”

Section: Discussionmentioning

confidence: 99%

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Reproductive strategies in black scabbardfish (Aphanopus carbo Lowe, 1839) from the NE Atlantic

et al. 2009

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suMMARY: gonads of the ne Atlantic black scabbardfish were examined to give an insight into the reproductive biology of this species. it was concluded that black scabbardfish had determinate fecundity because: (i) a distinct hiatus in oocyte size was observed between pre-vitellogenic and vitellogenic oocytes; (ii) vitellogenic oocytes increased in size during the spawning season; (iii) the number of vitellogenic oocytes did not increase during the spawning season; and (iv) the intensity of atresia was low in pre-spawning and spawning ovaries. Fecundity estimates ranged from 73 to 373 oocytes g -1 female. Comparison of developing ovaries from mainland Portugal and Madeira revealed that those from Madeira were more advanced in development, with more cortical alveoli stage oocytes and a higher gonadosomatic index. starting in July, the reproductive development of all females from mainland Portugal was interrupted by a generalised atresia of developing oocytes. Completion of gametogenesis and spawning only occurred for fish from Madeira but some fish from this area also failed to complete oocyte development due to mass follicular atresia of vitellogenic oocytes. the percentage of Madeiran fish that failed to spawn due to follicular atresia ranged from 21.2% in 2006 to 37.4% in 2005.Keywords: black scabbardfish, skipped spawning, fecundity, atresia, Portugal.ResuMen: Estrategias reproductivas en el sable negro (AphAnopus cArbo Lowe, 1839) en el Atlántico nordeste. -Las gónadas del sable negro del Atlántico nordeste fueron examinadas para conocer la biología reproductiva de esta especie. Los resultados sobre el tipo de fecundidad mostraron que la especie tenía una fecundidad determinada en base a los siguientes hechos: (i) hiato entre ovocitos previtelogénicos y vitelogénicos; (ii) aumento de tamaño de los ovocitos vitelogénicos durante el período de puesta; (iii) ausencia de incremento en el número permanente de ovocitos vitelogénicos avanzados durante el período de puesta y (iv) una pequeña atresia en los ovarios antes de la ovulación y durante ella. Las estimaciones de fecundidad se establecieron entre 73 y 373 ovocitos g -1 hembra. La comparación de los ovarios de hembras en desarrollo de aguas frente a Portugal continental y las de Madeira mostró una diferencia significativa en el tamaño medio de los ovocitos entre las dos áreas, y que las hembras de Madeira presentaron una mayor cantidad de ovocitos con alvéolos corticales y un índice gonadosomático mayor. A partir de julio y en hembras recolectadas frente a Portugal de continente, todos los individuos comenzaron a sufrir una atresia generalizada en sus ovocitos, mientras que en las aguas de Madeira, el ciclo reproductivo continúa hasta ovulación. sin embargo, en algunas hembras de Madeira la gametogénesis también se paraliza y todos los ovocitos vitelogénicos son absorbidos vía atresia folicular. el porcentaje de hembras no reproductivas varió del 21.23% en 2006 al 37.4% en 2005.Palabras clave: sable negro, skip spawning, fecundidad, atresia, Portugal. 2009, 19...

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Reproductive strategies in black scabbardfish (Aphanopus carbo Lowe, 1839) from the NE Atlantic

et al. 2009

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“…The reason why Aphanopus spp. occurs in deeper waters in the Canary Islands and Madeira may be in order to avoid overlapping with the trophic niches of other trichiurids as well as other species, such as Promethichthys prometheus (Pajuelo et al, 2008). Previous studies have concluded that otolith size is related to the habitat and behaviour of species (Paxton, 2000;Tuset et al, 2003;Volpedo and Echevarría, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, juveniles probably move from the northwest of Scotland to the Portuguese continental coast in search for food during their first years of life. When they reach sexual maturity, they migrate to the Macaronesian archipelagos, the only known reproductive areas (Martins et al, 1994;Machado et al, 1998;Figueiredo et al, 2003;Pajuelo et al, 2008;Neves et al, 2009). This means that the North Atlantic population may be considered as a population unit, independently of management and assessment aspects for regulating its fisheries.…”

Section: Introductionmentioning

confidence: 99%

“…The external identification of these species is currently impossible, since it is necessary to count dorsal fins and vertebrae in order to distinguish them (Nakamura and Parin, 1993;Parin, 1995). The bathymetric distribution of A. carbo ranges between 200 and 2300 m, although the depth of the most frequent distribution is around 1000 m; whereas A. intermedius lives from 300 to 1500 m (Nakamura and Parin, 1993;Lorance et al, 2001;Morales-Nin and Sena-Carvalho, 1996;Pajuelo et al, 2008). However, due to the current confusion between the two species, it is not possible to confirm precisely the depth distribution of each species.…”

Section: Introductionmentioning

confidence: 99%

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Using sagittal otoliths and eye diameter for ecological characterization of deep-sea fish: Aphanopus carbo and A. intermedius from NE Atlantic waters

Tuset¹,

Piretti²,

Lombarte³

et al. 2010

Sci. Mar.

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SUMMARY:The sagittal otolith and eye diameter of two sympatric species of the genus Aphanopus, A. carbo and A. intermedius, from North Atlantic waters were investigated. The study objectives were to find morphometric variables of otoliths to identify the two species and relate ecomorphological characters of otolith and eye diameter to the depth distribution of each species. The otoliths of the two species are very similar, although significant differences in shape, otolith height and weight and the sulcus acusticus area were detected. The ratio between eye diameter and cephalic length (ED:CL ratio) was also significantly different. In both analyses A. carbo obtained higher values, which suggests that A. carbo and A. intermedius live in different spatial niches, and that A. carbo inhabits deeper waters. The ratio between the sulcus and otolith areas (S:O) was low compared to other fish species, which suggests that the hearing capacity of Aphanopus spp. is adapted to low frequency sound. This adaptation may be related to the oceanographic conditions in which these species live, and in particular to the characteristics of sound transmission in the "SOFAR channel".Keywords: ecology, morphometry, otolith, Aphanopus carbo, Aphanopus intermedius, teleosts.RESUMEN: Uso del otolito sagitta y el diámetro del ojo para la caracterización ecológica de peces de profundidad: AphAnopus cArbo and A. intermedius del Atlántico nororiental. -El otolito sagitta y el diámetro del ojo de dos especies simpátricas del género Aphanopus, A. carbo y A. intermedius, del Atlántico Norte fueron analizados. Los objetivos del estudio se centraron en encontrar las variables morfométricas del otolito que pudiesen ser empleadas en la diferenciación de ambas especies y en establecer una correspondencia entre la profundidad de distribución de las especies y las características ecomorfológicas del otolito y del diámetro del ojo. Los otolitos de ambas especies resultaron ser parecidos, si bien se detectaron diferencias significativas en la forma, en el peso y la anchura del otolito y en el área del sulcus acusticus. La proporción entre el diámetro del ojo y la longitud cefálica (ED:CL) también puso de manifiesto diferencias significativas entre ambas especies. En ambos análisis, los resultados indicaron que A. carbo alcanza valores mayores. Ello proporciona evidencias para poder afirmar que A. carbo y A. intermedius viven en nichos espaciales diferentes, habitando A. carbo aguas más profundas. La proporción entre al área del sulcus y el área del otolito (S:O) alcanzó valores bajos en comparación con otras especies, lo cual sugiere que la capacidad auditiva de Aphanopus spp. está adaptada a sonidos de baja frecuencia. Dicha adaptación podría estar relacionada con las condiciones oceanográficas donde viven estas especies y, en particular, con las características de la transmisión del sonido dentro del denominado "canal SOFAR".

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A State Space Model Approach for Modelling the Population Dynamics of Black Scabbardfish in Portuguese Mainland Waters

Natário

Figueiredo

Carvalho

2015

CIM Series in Mathematical Sciences

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Biological parameters of the bathyal fish black scabbardfish (Aphanopus carbo Lowe, 1839) off the Canary Islands, Central-east Atlantic

Cited by 31 publications

References 21 publications

Reproductive strategies in black scabbardfish (<i>Aphanopus carbo</i> Lowe, 1839) from the NE Atlantic

Reproductive strategies in black scabbardfish (<i>Aphanopus carbo</i> Lowe, 1839) from the NE Atlantic

Using sagittal otoliths and eye diameter for ecological characterization of deep-sea fish: <i>Aphanopus carbo</i> and <i>A. intermedius</i> from NE Atlantic waters

A State Space Model Approach for Modelling the Population Dynamics of Black Scabbardfish in Portuguese Mainland Waters

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