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dc.contributor.authorGarcia, Luis Maria B.
dc.date.accessioned2013-02-01T02:15:51Z
dc.date.available2013-02-01T02:15:51Z
dc.date.issued1992
dc.identifier.citationGarcia, L. M. B. (1992). Lunar synchronization of spawning in sea bass, Lates calcarifer (Bloch): Effect of luteinizing hormone-releasing hormone analogue (LHRHa) treatment. Journal of Fish Biology, 40(3), 359–370.en
dc.identifier.issn0022-1112
dc.identifier.urihttp://hdl.handle.net/10862/1375
dc.description.abstractBased on egg collection records, spontaneous spawning activity of sea bass, Lates calcarifer (Bloch), reared in floating net cages followed a semilunar cycle. The peak of multiple spawnings coincided with declining spring tides of quarter moon periods. Maximum diameter of intra-ovarian, ripe oocytes (0.51–0.55 mm) occurred in synchrony with the quarter moon periods. Smaller oocytes (0.44–0.47 mm) were sampled during the new and full moon periods. Two structural analogues of luteinizing hormone-releasing hormone (LHRHa) (des-Gly10, D-Ala6-LHRH ethylamide and D-Ala6, Pro9-Nethylamide-LHRH), in pelleted or dissolved form, induced mature female sea bass with a mean egg diameter of at least 0.40 mm to spawn at any day during the lunar cycle. The onset of spontaneous and LHRHa-induced spawnings occurred during low tides in the evening until dawn (from 19.00 to 05.00 hours). These results demonstrate that LHRHa can effectively induce mature sea bass to spawn independent of the highly predictable semilunar spawning rhythm. In addition, the occurrence of both spontaneous and hormone-induced spawnings at a precise period of the day suggest a tidal and diurnal cue entraining spawning of mature female sea bass.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.subjectSea bassen
dc.subjectLates calcarifer
dc.subjectPhilippinesen
dc.titleLunar synchronization of spawning in sea bass, Lates calcarifer (Bloch): Effect of luteinizing hormone-releasing hormone analogue (LHRHa) treatmenten
dc.typeArticleen
dc.identifier.doi10.1111/j.1095-8649.1992.tb02583.x
dc.citation.volume40
dc.citation.issue3
dc.citation.spage359
dc.citation.epage370
dc.citation.journalTitleJournal of Fish Biologyen
seafdecaqd.library.callnumberVF SJ 0373
seafdecaqd.databank.controlnumber1992-44
dc.subject.asfaBiological rhythmsen
dc.subject.asfaCage cultureen
dc.subject.asfaFish cultureen
dc.subject.asfaInduced breedingen
dc.subject.asfaMoon phasesen
dc.subject.asfaOvariesen
dc.subject.asfaOvulationen
dc.subject.asfaSex hormonesen
dc.subject.asfaSexual maturityen
dc.subject.asfaSpawningen


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