caa a22 4500 46576388X CHVBK 20180323111907.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF00237818 doi (NATIONALLICENCE)springer-10.1007/BF00237818 Radtke Richard Oceanic Biology, Hawaii Institute of Geophysics, University of Hawaii, 96822, Honolulu, HI, USA aut Age determination of the Antarctic fishes Champsocephalus gunnari and Notothenia rossii marmorata from South Georgia [Elektronische Daten] [Richard Radtke] Summary: Investigations were performed on otoliths from Champsocephalus gunnari and Notothenia rossii marmorata as part of an effort to study the population dynamics of Antarctic fishes. Examination of otoliths by scanning electron microscope (SEM) revealed internal microincrements which were similar to daily increments described for other fish species. No easily identifiable annuli could be discerned and fishes were aged by counting microincrements. Multiple regression analyses relating age to otolith morphometrics and fish size, provided a simpler ageing method. It was determined with these techniques that C. gunnari grew to 50 cm in 15 yrs and N. rossii marmorata grew to 50 cm in 6.5 yrs. The lack of larger-sized individuals for N. rossii marmorata may be indicative of recent overfishing with only the younger age groups remaining. It appears that length-at-age data determined on a yearly basis, could provide valuable scientific and management information for these species. Springer-Verlag, 1990 Polar Biology Springer-Verlag 10/5(1990-05-01), 321-327 0722-4060 10:5<321 1990 10 300 https://doi.org/10.1007/BF00237818 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00237818 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Radtke Richard Oceanic Biology, Hawaii Institute of Geophysics, University of Hawaii, 96822, Honolulu, HI, USA aut NATIONALLICENCE 773 0- Polar Biology Springer-Verlag 10/5(1990-05-01), 321-327 0722-4060 10:5<321 1990 10 300 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer