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Rearing and spawning siganids (Pisces: Teleostei) in a closed seawater system

Aufzucht und Ablaichen von Siganiden (Pisces: Teleostei) in einem geschlossenen Seewasserkreislauf

Helgoländer wissenschaftliche Meeresuntersuchungen volume 27, pages 1–18 (1975)Cite this article

Kurzfassung

Aus den Philippinen importierte Jungfische vonSiganus oramin undS. concatenata (S. guttatus?) wurden bei 26° C und 32‰ S im geschlossenen Seewasserkreislauf mit verschiedenen kommerziellen Kunstfuttersorten (Hühnerfutter, Kaninchenfutter, Tetramin) aufgezogen und das Längen- und Gewichtswachstum über 26 Wochen verfolgt. Nach dieser Zeit wurden die ersten Tiere geschlechtsreif und durch mehrfache Hormoninjektionen (HCG) zum Abstreifen vorbereitet. Die künstliche Befruchtung der Eier gelang beiS. oramin mehrfach. Die Befruchtungsversuche wurden bei 12,1, 15,8, 20,9, 30,6, 32,2‰S und 26° C durchgeführt. Zwischen 20,9 und 32,2‰ S betrug die Befruchtungsrate 95% und darüber. Die Embryonalentwicklung und die Larvalentwicklung während der Dotterzehrung werden beschrieben.

Summary

  1. 1.

    Two species of signaids from The Philippines,Siganus oramin andS. concatenata (S. guttatus?), were reared in a closed sea water system and fed different artificial feeds.

  2. 2.

    A comparison between commercial chicken and rabbit feeds in regard to their suitability as siganid feeds led to the conclusion that for this purpose the latter was the more appropriate diet.

  3. 3.

    Within six months juvenileS. oramin (4–6 cm, 2–6 g) reached maturity and were treated with human chorionic hormone (HCG) in order to induce ovulation.

  4. 4.

    Two females were successfully stripped after having received HCG injections. The eggs were artificially inseminated and incubated at 15.8, 20.9, 30.6 and 32.2‰ S.

  5. 5.

    Early embryogenesis was evaluated by means of time lapse movie pictures (two frames/min).

  6. 6.

    Incubation of the eggs at 26°–28° C took 29 h from fertilization to hatching. Viable larvae hatched only between 20.9 and 32.2‰S and larval survival was best in 32.2‰S. There was no viable hatch at 15.8‰S, and no fertilization occured at 12.1‰S.

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Authors and Affiliations

  1. Biologische Anstalt Helgoland (Zentrale), Hamburg 50, Federal Republic of Germany

    H. von Westernhagen & H. Rosenthal

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  1. H. von Westernhagen
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  2. H. Rosenthal
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von Westernhagen, H., Rosenthal, H. Rearing and spawning siganids (Pisces: Teleostei) in a closed seawater system. Helgolander Wiss. Meeresunters 27, 1–18 (1975). https://doi.org/10.1007/BF01611684

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Helgoland Marine Research

ISSN: 1438-3888

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