Incubation of eggs and larvae of pacu (Piaractus mesopotamicus holmberg, 1887) in israeli and woynarovich incubators<br/>Incubação de ovos e larvas de pacu (Piaractus mesopotamicus holmberg, 1887) em incubadoras do tipo israelense e woynarovich

The aim of this work was to evaluate the fertilization and hatching rates of eggs of Piaractus mesopotamicus hormonally induced, and the survivorship and percentage of defective larvae at 48 and 72 hours after hatching in Israeli and Woynarovich hatcheries. A pool of eggs and larvae obtained from te...

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Bibliographic Details
Main Authors: Ricardo Pereira Ribeiro, Darci Carlos Fornari, Jeferson Antonio Dias Dias, Luis Ricardo Jayme Guerreiro, Marco Anonio Zanoni
Format: Article
Language:English
Published: Universidade Estadual de Londrina 2011-07-01
Series:Semina: Ciências Agrárias
Subjects:
Online Access:http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/3497
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Summary:The aim of this work was to evaluate the fertilization and hatching rates of eggs of Piaractus mesopotamicus hormonally induced, and the survivorship and percentage of defective larvae at 48 and 72 hours after hatching in Israeli and Woynarovich hatcheries. A pool of eggs and larvae obtained from ten females and twenty males was used. The experimental design was completely randomized with two treatments and four replicates. The fertilization averages did not demonstrate significant differences (P > 0,05) between the treatments. Hatching values (%) were significantly higher (P < 0,05) in Woynarovich hatcheries; the survivorship (%) of the larvae at 48 and 72 hours after hatching were significantly higher (P < 0,05) in Israeli hatcheries; and the percentage of defective larvae was significantly lower (P < 0,05) in Israeli hatcheries in both evaluation times. According to the results, the Israeli hatcheries present better conditions for larvae survivorship.<p><p>O objetivo neste estudo foi avaliar as taxas de fertilização e eclosão dos ovos de Piaractus mesopotamicus induzidos com extrato de hipófise, além da sobrevivência e porcentagem de larvas defeituosas após 48 e 72 horas da eclosão em incubadoras do tipo “Israelense” e “Woynarovich”. Utilizou se um “Pool” de ovos e larvas obtidas de 10 fêmeas e 20 machos. O delineamento experimental foi totalmente casualisado com dois tratamentos e quatro repetições. As médias de fertilização não demonstraram diferenças significativas (P > 0,05) entre as incubadoras. Os valores de eclosão (%) foram significativamente maiores (P < 0,05) nas incubadoras do tipo Woynarovich, a sobrevivência (%) das larvas após 48 horas da eclosão foi significativamente maior (P < 0,05) nas incubadoras do tipo Israelense, o mesmo foi observado após 72 horas da eclosão. A porcentagem de larvas defeituosas foi significativamente menor (P < 0,05) nas incubadoras do tipo israelense nos dois períodos avaliados. De acordo com os resultados obtidos, as incubadoras do tipo “Israelense” demonstraram melhores condições para a sobrevivência das larvas.
ISSN:1676-546X
1679-0359