Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic
[eng] Aphanopus carbo (Lowe, 1839), the black scabbardfish, is a benthopelagic teleost with high commercial value in the NE Atlantic, especially in Madeira Archipelago and mainland Portugal. Given its commercial interest and high susceptibility to overfishing, as a consequence of low fecundity and l...
Main Author: | |
---|---|
Other Authors: | |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | http://hdl.handle.net/10803/673480 |
id |
ftubaleares:oai:www.tdx.cat:10803/673480 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Universitat de les Illes Balears (UIB): Theses and Dissertations Online (TDX) |
op_collection_id |
ftubaleares |
language |
English |
topic |
Aphanopus carbo black scabbardfish benthopelagic NE Atlantic population dynamics migration fatty acids stable isotopes sex steroids otolith trace elements peix sable negra bentopelàgic NE Atlàntic dinàmica de la població migració àcids grassos isòtops estables esteroids sexuals otòlit elements traça sable negro bentopelágico Atlántico NE dinámica poblacional migración ácidos grasos isotopos estables esteroides sexuales otolito elementos traza Ictiologia i Biologia Pesquera 57 574 |
spellingShingle |
Aphanopus carbo black scabbardfish benthopelagic NE Atlantic population dynamics migration fatty acids stable isotopes sex steroids otolith trace elements peix sable negra bentopelàgic NE Atlàntic dinàmica de la població migració àcids grassos isòtops estables esteroids sexuals otòlit elements traça sable negro bentopelágico Atlántico NE dinámica poblacional migración ácidos grasos isotopos estables esteroides sexuales otolito elementos traza Ictiologia i Biologia Pesquera 57 574 Alves Farias, Inês Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
topic_facet |
Aphanopus carbo black scabbardfish benthopelagic NE Atlantic population dynamics migration fatty acids stable isotopes sex steroids otolith trace elements peix sable negra bentopelàgic NE Atlàntic dinàmica de la població migració àcids grassos isòtops estables esteroids sexuals otòlit elements traça sable negro bentopelágico Atlántico NE dinámica poblacional migración ácidos grasos isotopos estables esteroides sexuales otolito elementos traza Ictiologia i Biologia Pesquera 57 574 |
description |
[eng] Aphanopus carbo (Lowe, 1839), the black scabbardfish, is a benthopelagic teleost with high commercial value in the NE Atlantic, especially in Madeira Archipelago and mainland Portugal. Given its commercial interest and high susceptibility to overfishing, as a consequence of low fecundity and low growth rate, improving the knowledge on its life cycle and population dynamics is of uttermost importance for improving fisheries management and advice. Although some questions persist, the agreed assumption is that there is a unique stock that undergoes a clockwise migration around the NE Atlantic driven by feeding and reproduction. The available information that supports the hypothetical migratory cycle of A. carbo was reviewed in this Thesis and different methodological approaches were proposed to explore its life history traits and relate them with the migratory cycle, in order to increase information on the species for a sustainable knowledge-based fishery management, and to assess its population dynamics and spatial pattern in the NE Atlantic. Differences in fatty acids and stable isotopes concentrations in the muscle tissue of specimens from different areas supported the species hypothetical migratory cycle. Mature specimens showed a prevalence of polyunsaturated fatty acids (PUFA) which are related with high energetic demands, supporting the hypothesis that the black scabbardfish continues to feed during the spawning period. PUFA associated with a response to stress were high in specimens from the southernmost areas which might be related with the expected long-distance migrations. The analysis of sex steroids in blood serum confirmed their role as intrinsic triggers for gonadal maturation and spawning in black scabbardfish. Based on estradiol (E2) and testosterone (T) concentrations, some developing females from Madeira were clustered with females from mainland Portugal, giving evidence that not all developing females will have the ability to mature and reproduce during the current spawning season. The ... |
author2 |
Morales Nin, Beatriz |
format |
Doctoral or Postdoctoral Thesis |
author |
Alves Farias, Inês |
author_facet |
Alves Farias, Inês |
author_sort |
Alves Farias, Inês |
title |
Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
title_short |
Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
title_full |
Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
title_fullStr |
Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
title_full_unstemmed |
Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic |
title_sort |
dynamics of the deep-sea teleost black scabbardfish (aphanopus carbo lowe, 1839) in the northeast atlantic |
publishDate |
2021 |
url |
http://hdl.handle.net/10803/673480 |
long_lat |
ENVELOPE(-30.309,-30.309,-80.537,-80.537) |
geographic |
Lowe |
geographic_facet |
Lowe |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
TDX (Tesis Doctorals en Xarxa) |
op_relation |
http://hdl.handle.net/10803/673480 |
op_rights |
ADVERTIMENT. Tots els drets reservats. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs. info:eu-repo/semantics/openAccess |
_version_ |
1786197597275291648 |
spelling |
ftubaleares:oai:www.tdx.cat:10803/673480 2023-12-24T10:23:32+01:00 Dynamics of the deep-sea teleost black scabbardfish (Aphanopus carbo Lowe, 1839) in the Northeast Atlantic Alves Farias, Inês Morales Nin, Beatriz 2021-11-03 application/pdf 149 p. http://hdl.handle.net/10803/673480 eng eng http://hdl.handle.net/10803/673480 ADVERTIMENT. Tots els drets reservats. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs. info:eu-repo/semantics/openAccess TDX (Tesis Doctorals en Xarxa) Aphanopus carbo black scabbardfish benthopelagic NE Atlantic population dynamics migration fatty acids stable isotopes sex steroids otolith trace elements peix sable negra bentopelàgic NE Atlàntic dinàmica de la població migració àcids grassos isòtops estables esteroids sexuals otòlit elements traça sable negro bentopelágico Atlántico NE dinámica poblacional migración ácidos grasos isotopos estables esteroides sexuales otolito elementos traza Ictiologia i Biologia Pesquera 57 574 info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2021 ftubaleares 2023-11-30T06:34:02Z [eng] Aphanopus carbo (Lowe, 1839), the black scabbardfish, is a benthopelagic teleost with high commercial value in the NE Atlantic, especially in Madeira Archipelago and mainland Portugal. Given its commercial interest and high susceptibility to overfishing, as a consequence of low fecundity and low growth rate, improving the knowledge on its life cycle and population dynamics is of uttermost importance for improving fisheries management and advice. Although some questions persist, the agreed assumption is that there is a unique stock that undergoes a clockwise migration around the NE Atlantic driven by feeding and reproduction. The available information that supports the hypothetical migratory cycle of A. carbo was reviewed in this Thesis and different methodological approaches were proposed to explore its life history traits and relate them with the migratory cycle, in order to increase information on the species for a sustainable knowledge-based fishery management, and to assess its population dynamics and spatial pattern in the NE Atlantic. Differences in fatty acids and stable isotopes concentrations in the muscle tissue of specimens from different areas supported the species hypothetical migratory cycle. Mature specimens showed a prevalence of polyunsaturated fatty acids (PUFA) which are related with high energetic demands, supporting the hypothesis that the black scabbardfish continues to feed during the spawning period. PUFA associated with a response to stress were high in specimens from the southernmost areas which might be related with the expected long-distance migrations. The analysis of sex steroids in blood serum confirmed their role as intrinsic triggers for gonadal maturation and spawning in black scabbardfish. Based on estradiol (E2) and testosterone (T) concentrations, some developing females from Madeira were clustered with females from mainland Portugal, giving evidence that not all developing females will have the ability to mature and reproduce during the current spawning season. The ... Doctoral or Postdoctoral Thesis Northeast Atlantic Universitat de les Illes Balears (UIB): Theses and Dissertations Online (TDX) Lowe ENVELOPE(-30.309,-30.309,-80.537,-80.537) |