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Gametogenesis in the Antarctic plunderfishes Artedidraco lönnbergi and Artedidraco skottsbergi (Pisces: Artedidraconidae) from the Ross Sea

Published online by Cambridge University Press:  02 June 2006

Mario La Mesa
Affiliation:
ISMAR-CNR, Istituto di Scienze Marine, Sezione Pesca Marittima, Largo Fiera della Pesca, 60125 Ancona, Italy
Vincenzo Caputo
Affiliation:
Istituto di Biologia e Genetica, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Riccardo Rampa
Affiliation:
Istituto di Biologia e Genetica, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy
Joseph T. Eastman
Affiliation:
Department of Biomedical Sciences, College of Osteopathic Medicine, Ohio University, Athens, OH 45701-2979, USA

Abstract

The Antarctic plunderfishes Artedidraco lönnbergi and A. skottsbergi are small, bottom dwelling species inhabiting the continental shelf of the High Antarctic Zone. During cruise 97–9 of the US RV Nathaniel Palmer during the summer in the south-western Ross Sea, samples of both species were collected by means of bottom trawling. On the basis of macroscopic and histological analysis, we present the first data on the reproductive characteristics of these two plunderfishes, including gametogenesis, spawning period and absolute fecundity. Histologically, we found immature (stage I and II) and mature (stage V) females in both species, whereas developing females (stage III) were found only in A. skottsbergi. All examined male specimens of A. skottsbergi were in the final stage of spermatogenesis (stage III), whereas male A. lönnbergi were immature (stage I), mature (stage IV) and post-reproductive (stage V) individuals. In both species, spawning takes place in summer during December and January. Absolute fecundity was very low, with less than 100 and 200 oocytes in A. lönnbergi and A. skottsbergi, respectively. These data are compared with those reported in literature for other artedidraconids.

Type
Research Article
Copyright
© Antarctic Science Ltd 2006

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Gametogenesis in the Antarctic plunderfishes Artedidraco lönnbergi and Artedidraco skottsbergi (Pisces: Artedidraconidae) from the Ross Sea
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Gametogenesis in the Antarctic plunderfishes Artedidraco lönnbergi and Artedidraco skottsbergi (Pisces: Artedidraconidae) from the Ross Sea
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