Frontiers in Marine Science (Oct 2015)
Age, growth and distribution of the Antarctic fish Chaenocephalus aceratus based on otoliths
Abstract
The Chaenocephalus aceratus were sampled in the summer between 1979 and 1990 at South Georgia Is. The problems of ageing Antarctic fish Channichthyidae are commonly known (Kock, 1989; Le_François, 2014; Campana, 2014) they have not scales and their bones undergo constant and large reduction (Żabrowski, 2000). It was found that the otoliths of C. aceratus show daily pattern of microincrements as otoliths of similar species Pseudochaenichthys georgianus, Champsocephalus gunnari and fishes both temperate and tropical waters. Width of larvae - postlarvae daily increments are: (1.0 - 1.6)•10-3 SSI; (1.8 - 2.8)•10-3 SGI; (1.5 - 2.4)•10-3 ANI. Changes of the microincrements growth pattern are described in relation to larval, hatching and metamorphosis stages and have similar patterns for Ps. georgianus and C. gunnari reflecting similar habitats in their early life. Age of fish estimated from microincrements was alike to that inferred from the body length distribution and otoliths mass: age (years) = 140.82 • OM (g) + 0.8546. C. aceratus due to its adaptation to cold water, attain rapidly large body according to a growth equation: Lt = 75.1(1 - exp(-0.26(t – 0.51))). Bibliography Campana, S. 2014. IOS2014 Otolith Reading Contest: "The otolith was from an 11-year old Sebastes. There was a huge range of guesses from the Otolith Symposium though, ranging from 0 to 93 years". 5th International Otolith Symposium in Mallorca, Spain: e-mail to author from [email protected], 2014. Kock, K. H. 1989. Results of the CCAMLR Antarctic fish otoliths / scales / bones exchange system. Hobart : SCCCAMLR-SSP/6, 1989. Le_François, N. R. 2014. ...icefishes is that they can be difficult to interpret due to their growth patterns... research Palmer Station : e-mail Oct.,10.2014 to ryszardtraczyk from [email protected], 2014. Żabrowski, M. 2000. The osteology and ossification variability of the skull of antarctic white-blooded fish Chaenodraco wilsoni Regan, 1914 (Channichthyidae, Notothenioidei). W-wa : Acta Icht. Piscat. 30 (2): 111-126.
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