Reproduction and early life history of sea urchins, Arbacia dufresnei and Pseudechinus magellanicus, in Chiloe Island and Reloncavi sound, Chile

• Published in: Aquaculture Science Vol. 58; no. 1; pp. 65 - 73
• Main Author: Kino, S., INTEM Consulting, Inc., Tokyo (Japan)
• Format: Journal Article
• Language: English
• Published: Japanese Society for Aquaculture Science 01.03.2010
• Subjects: Arbacia; Arbacia dufresnei; ARBACIIDAE; BREEDING SEASONS; CICLO VITAL; CYCLE DE DEVELOPPEMENT; ECHINOIDEA; EPOCA DE APAREAMIENTO; GENITALIA; http://www.fao.org/aos/agrovoc#c_1080; http://www.fao.org/aos/agrovoc#c_27961; http://www.fao.org/aos/agrovoc#c_32012; http://www.fao.org/aos/agrovoc#c_4204; http://www.fao.org/aos/agrovoc#c_4317; http://www.fao.org/aos/agrovoc#c_49380; http://www.fao.org/aos/agrovoc#c_6507; LARVAE; LARVAS; LARVE; LIFE CYCLE; Marine; Pseudechinus magellanicus; REPRODUCCION; REPRODUCTION; SAISON D'ACCOUPLEMENT; ISE, Chile; PSW, Chile, Los Lagos, Chiloe I
• ISSN: 0371-4217; 2185-0194
• DOI: 10.11233/aquaculturesci.58.65

The reproduction and larval appearance of two sea urchins, Arbacia dufresnei and Pseudechinus magellanicus, were investigated in eastern coastal waters of Chiloe 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/square m at 2.6 mm in test diameter were observed in Caicura of Reloncavi sound in January 1988.