Age, growth and distribution of the Antarctic fish Chaenocephalus aceratus based on otoliths
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1
University of Gdansk, Faculty of Oceanography and Geography, Poland
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 Steve.Campana@dfo-mpo.gc.ca, 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 nle_francois@ville.montreal.qc.ca, 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.
Keywords:
Chaenocephalus aceratus,
otolith shape,
age of icefish,
Antarctic fish.,
SSI
Conference:
XV European Congress of Ichthyology, Porto, Portugal, 7 Sep - 11 Sep, 2015.
Presentation Type:
Poster Presentation
Topic:
Otoliths as a tool to study fish life cycles
Citation:
Traczyk
RJ
(2015). Age, growth and distribution of the Antarctic fish Chaenocephalus aceratus based on otoliths.
Front. Mar. Sci.
Conference Abstract:
XV European Congress of Ichthyology.
doi: 10.3389/conf.fmars.2015.03.00015
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Received:
23 Oct 2015;
Published Online:
04 Nov 2015.
*
Correspondence:
Mr. Ryszard J Traczyk, University of Gdansk, Faculty of Oceanography and Geography, Gdynia, Pomeranian, 81-378, Poland, ryszardtraczyk@gmail.com