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Early life history traits of Trematomus scotti in the Bransfield Strait

Published online by Cambridge University Press:  25 June 2015

Mario La Mesa ,
Barbara Catalano  and
Christopher D. Jones
Mario La Mesa*
Affiliation:
ISMAR-CNR, Istituto di Scienze Marine, Sede di Ancona, Largo Fiera della Pesca, 60125 Ancona, Italy
Barbara Catalano
Affiliation:
ISPRA, Istituto Superiore per la Protezione e la Ricerca Ambientale, Via Vitaliano Brancati 48, 00144 Roma, Italy
Christopher D. Jones
Affiliation:
Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, 8901 La Jolla Shores Drive, La Jolla, CA 92037, USA
*
[email protected]
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Abstract

Early life history traits of the blackfin notothen, Trematomus scotti, were investigated through otolith microincrement pattern and stomach content analyses. Post-larval specimens of 12–20 mm standard length (SL) were collected in the Bransfield Strait and adjacent waters during the 2010–11 summer. Catches were unevenly distributed across the surveyed area, yielding a relative abundance of 0.3–3.6 specimens per 1000 m3 of filtered sea water. Age estimates ranged from 34 to 67 days, with good consistency and no apparent bias between readings. Based on an exponential model fitted to the age-length dataset, the growth rate was 0.17 mm day-1, corresponding to a daily percentage increment in size of 1.07% SL. In agreement with previous studies, larval hatching occurred at a mean size of 9.0 mm and was spread over a relatively short period, lasting from late December to late January. Prey composition consisted exclusively of copepods, mainly larval stages of copepodites. Feeding intensity ranged from 1–14 prey items per stomach, being positively correlated with larval fish size. In summary, T. scotti shares a common early life history strategy with several other notothenioids, consisting of small larvae hatching in summer and overwintering as pelagic early juveniles until the following summer season.

Keywords

age and growthAntarctic Peninsulafeedinglarvaenototheniidae
Type
Biological Sciences
Information
Antarctic Science , Volume 27 , Issue 6 , December 2015 , pp. 535 - 542
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Copyright
© Antarctic Science Ltd 2015 

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