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Vinsamlegast notið þetta auðkenni þegar þið vitnið til verksins eða tengið í það: http://hdl.handle.net/1946/35377

Titill: 
  • Titill er á ensku Age Assessment of Black Dogfish (Centroscyllium fabricii) and Great Lanternshark (Etmopterus princeps)
Námsstig: 
  • Bakkalár
Leiðbeinandi: 
Útdráttur: 
  • Útdráttur er á ensku

    Scarce information is available about many deep-sea shark species, especially regarding suitable methods for age assessment. In this study, I attempted to age two species of the family Etmopteridae; the Black Dogfish (Centroscyllium fabricii) and the Great Lanternshark (Etmopterus princeps). As sharks are generally known to form annual growth bands on dorsal fin spines and/or vertebrae these were used in order to estimate age in years. Fifteen vertebrae belonging to two specimens of C. fabricii and one specimen of E. princeps were examined, along with fin spines from 1997 to 1998, mainly from C. fabricii. A total of 18 individuals were aged using anal fin spines, ranging between 32 and 65 years. Statistically significant correlations were found between estimated age and total length, and anal spine length and total length. Results from the study suggest the need for reliable prior knowledge to confirm accuracy of estimated ages, and the development of more suitable ageing methods to use in these species.

Samþykkt: 
  • 18.5.2020
URI: 
  • http://hdl.handle.net/1946/35377


Skrár
Skráarnafn Stærð AðgangurLýsingSkráartegund 
Age Assessment of C.fabricii-Final.pdf1.02 MBOpinnHeildartextiPDFSkoða/Opna
Skemman_yfirlysing-Ása Guðmundsdóttir.pdf204.95 kBLokaðurYfirlýsingPDF