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dc.contributor.authorAya, Frolan
dc.contributor.authorCorpuz, Mark Nell C.
dc.contributor.authorLaron, Manuel A.
dc.contributor.authorGarcia, Luis Maria
dc.date.accessioned2018-05-23T06:11:24Z
dc.date.available2018-05-23T06:11:24Z
dc.date.issued2017
dc.identifier.citationAya, F. A., Copruz, M. N. C., Laron, M. A., & Garcia, L. M. B. (2017). Larval and early juvenile development of silver therapon, Leiopotherapon plumbeus (Actinopterygii: Perciformes: Terapontidae), reared in mesocosms. Acta Ichthyologica et Piscatoria, 47(4), 347-356.en
dc.identifier.issn0137-1592
dc.identifier.urihttp://hdl.handle.net/10862/3295
dc.description.abstractThe silver therapon, Leiopotherapon plumbeus (Kner, 1864), is an endemic and economically important freshwater food fish in the Philippines. The natural populations of this species have been declining during the past years, mainly due to intense fishing pressure, habitat degradation, and introduction of invasive alien species. At present, it is considered a target species for domestication and conservation efforts. Despite several attempts of artificial reproduction and larval rearing, little is known on larval and early juvenile development of silver therapon. The presently reported study was therefore intended to fill this gap in the knowledge by determining the growth and describing body proportions, pigmentation, and fin formation of this fish. Newly hatched larvae were reared in mesocosm tanks at a mean temperature of 29.5°C. Larvae up to 30 days after hatching were sampled at irregular intervals and preserved in 5% buffered formalin. Early development stages for 245 preserved specimens were described in detail with reference to changes in morphology, growth and body proportions, pigmentation, and fin formation. Five developmental stages of silver therapon were identified: yolk sac larva (1.88 mm TL), preflexion (2.51 mm TL), notochord flexion (4.50-8.27 mm TL), postflexion larva (6.90-12.21 mm TL), and early juvenile (>13.40 mm TL). Growth was isometric for eye diameter and gape size whereas positive allometry was observed for body depth, head length, and preanal length. Some body proportions showed abrupt changes from preflexion to postflexion larvae before it stabilized during the early juvenile stage. Pigmentation in the form of stellate and punctate melanophores increased with developmental stage, with larvae becoming heavily pigmented from postflexion to early juvenile stage. These morphological changes, together with the full complement of fin rays and squamation observed in specimens larger than 13.4 mm TL, suggest the attainment of the juvenile stage of this species. These morphological changes may explain the food and feeding habits during the early life stages of silver therapon which is critical to their survival and recruitment in the wild and in a mesocosm hatchery environment.en
dc.description.sponsorshipThis work was supported by SEAFDEC Aquaculture Department under the Study code: Nr-04- F2010B. We express our gratitude to Miss Julie Andrea P. Añano, Mr Nemencio B. Olorvida and the student interns from the Polytechnic University of the Philippines (Santa Mesa, Manila) for their assistance during the study.en
dc.language.isoenen
dc.publisherSzczecińskie Towarzystwo Naukoween
dc.relation.urihttp://www.aiep.pl/volumes/2010/8_4/pdf/04_2222_F1.pdf
dc.subjectPhilippinesen
dc.subjectyolk sacen
dc.subjectland degradationen
dc.subjectpigmentationen
dc.subjecthabitsen
dc.titleLarval and early juvenile development of silver therapon, Leiopotherapon plumbeus (Actinopterygii: Perciformes: Terapontidae), reared in mesocosmsen
dc.typeArticleen
dc.citation.volume47
dc.citation.issue4
dc.citation.spage347
dc.citation.epage356
dc.citation.journalTitleActa Ichthyologica et Piscatoriaen
dc.subject.asfafishing efforten
dc.subject.asfafreshwater fishesen
dc.subject.asfafishen
dc.subject.asfaenvironmental degradationen
dc.subject.asfadomesticationen
dc.subject.asfafooden
dc.subject.asfafisheriesen
dc.subject.asfaallometryen
dc.subject.asfainland water environmenten
dc.subject.asfadevelopmental stagesen
dc.subject.asfacommercial fishingen
dc.subject.asfapopulationen
dc.subject.asfabiologyen
dc.subject.asfafinsen
dc.subject.asfaintroduced speciesen
dc.subject.asfahatchingen
dc.subject.asfagrowthen
dc.subject.asfafishingen
dc.subject.asfaendemic speciesen
dc.subject.asfalarvaeen
dc.subject.asfanature conservationen
dc.subject.asfainduced ovulationen
dc.subject.asfabiodegradationen
dc.subject.asfatanksen
dc.subject.asfachromatophoresen
dc.subject.asfajuvenilesen
dc.subject.asfarearing techniquesen
dc.subject.asfaspeciesen
dc.subject.asfamesocosmsen
dc.subject.asfafood fishen
dc.subject.asfahatcheriesen
dc.subject.asfaegg yolken
dc.subject.asfareproductionen
dc.subject.asfaanimal morphologyen
dc.subject.asfameristic countsen
dc.subject.asfacatch-efforten
dc.identifier.essn1734-1515
dc.identifier.doi10.3750/AIEP/02222
dc.subject.scientificNameLeiopotherapon plumbeusen
local.subjectgrowthen
local.subjectmorphologyen
local.subjectbody proportionen
local.subjectfish larvaeen


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    These papers were contributed by AQD staff to various national and international journals

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