Reproduction and Early Life History of Sea Urchins, <I>Arbacia dufresnei</I> and <I>Pseudechinus magellanicus</I>, in Chiloé Island and Reloncaví Sound, Chile

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  • チリ共和国チロエ島およびレロンカヴィ入江におけるウニ，<I>Arbacia dufresnei</I> と <I>Pseudechinus magellanicus</I> の生殖と初期生態
  • Reproduction and early life history of sea urchins, Arbacia dufresnei and Pseudechinus magellanicus, in Chiloe Island and Reloncavi sound, Chile

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Abstract

The reproduction and larval appearance of two sea urchins, Arbacia dufresnei and Pseudechinus magellanicus, were investigated in eastern coastal waters of Chiloé Island, Chile. Adults were collected from March 1987 to February 1988 in Hueihue (A. dufresnei) and Teupa (P. magellanicus), and gonadal changes were studied. Their spawning season was estimated to be from August to October. The larval appearance of these 2 species was investigated by collecting plankton in Hueihue (March 1987-February 1988, and October 1988-March 1989) and Teupa (March 1987-January 1988). Larvae of A. dufresnei appeared from May to November and those of P. magellanicus appeared mainly from August to October. The appearance of metamorphic larvae was relatively distinct. Further, juvenile P. magellanicus was investigated in waters on the continental side, and juveniles of 20000 individuals/m2 at 2.6 mm in test diameter were observed in Caicura of Reloncaví sound in January 1988.

Journal

  • Aquaculture Science

    Aquaculture Science 58 (1), 65-73, 2010

    Japanese Society for Aquaculture Science

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