The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands (Articolo in rivista) (literal)

Anno

• 2007-01-01T00:00:00+01:00 (literal)

Alternative label

• La Mesa M. (2007)
  The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands
  in Polar biology (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• La Mesa M. (literal)

Pagina inizio

• 1219 (literal)

Pagina fine

• 1226 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni

• DOI: 10.1007/s00300-007-0281-3 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 30 (literal)

Rivista

• Polar biology (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• (1) ISMAR-CNR, Istituto di Scienze Marine, Sezione di Ancona, Largo Fiera della Pesca, 60125 Ancona, Italy (literal)

Titolo

• The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands (literal)

Abstract

• Juvenile Antarctic toothfish (Dissostichus mawsoni) collected off the South Shetland Islands (CCAMLR Subarea 48.1) were aged by counting the presumed daily increments in the sagittal otoliths. The timing and position of the first annulus was examined for each individual fish from 10 to 13 cm TL. Under reflected light at low magnification, the otolith sections exhibited a wide opaque nucleus, with no evidence of deposition of the first translucent zone. The average measurement of ventral and dorsal radii of these sections were, respectively, 603 and 768 ìm, consistently less than the measurements done in previously estimated 1 year old fish caught in the same area. All specimens aged in the present study were approximately 1 year old fish, with an age range between 365 and 431 days, suggesting a significant underestimation of age in the previous studies. The value of ageing precision indices calculated was relatively low, supporting the reliability of the reading technique applied. Two checks were easily identified in the core of all otolith sections, interpreted tentatively as hatching and first exogenous feeding checks. Back-calculating from the time of capture, the hatching period of D. mawsoni was estimated to occur throughout the summer season, from November to February. In conclusion, the delay in timing of deposition of the first translucent zone, which occurs in the second winter from hatching, should be taken into account in future studies on ageing Antarctic toothfish, as well as in the stock assessment models based on length at age data. (literal)

Prodotto di

• Marine science institute (ISMAR) (Istituto)
• Ruolo degli ambienti estremi nei processi climatici globali (TA.P02.006.008) (Modulo)
• Conoscenza del livello di funzionalità degli ecosistemi marini soggetti ad attività antropiche e a sfruttamento sostenibile delle risorse (TA.P04.007.001) (Modulo)

Autore CNR

• MARIO LA MESA (Persona)

Insieme di parole chiave

• Parole chiave di "The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands" (Insieme di parole chiave)

Incoming links:

Prodotto

• Marine science institute (ISMAR) (Istituto)
• Conoscenza del livello di funzionalità degli ecosistemi marini soggetti ad attività antropiche e a sfruttamento sostenibile delle risorse (TA.P04.007.001) (Modulo)
• Ruolo degli ambienti estremi nei processi climatici globali (TA.P02.006.008) (Modulo)

Autore CNR di

• MARIO LA MESA (Persona)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Polar biology (Rivista)

Insieme di parole chiave di

• Parole chiave di "The utility of otolith microstructure in determining the timing and position of the first annulus in juvenile Antarctic toothfish ( Dissostichus mawsoni ) from the South Shetland Islands" (Insieme di parole chiave)