Data/hora: 10/06/2024 13:35:09

Provedor de dados: | 96
País: | Brazil
Título: | Effect of photoperiod on locomotor activity, growth, feed efficiency and gonadal development of Nile tilapia
Autores: | Veras,Galileu Crovatto; Murgas,Luis David Solis; Rosa,Priscila Vieira; Zangeronimo,Márcio Gilberto; Ferreira,Matheus Soares da Silva; Leon,Jonathan Antonio Solis-De.
Data: | 2013-12-01
Ano: | 2013
Palavras-chave: | Feed intake; Fish; Locomotor rhythm; Oreochromis niloticus; Performance; Sexual maturation.
Resumo: | The objective of this study was to evaluate the effect of photoperiod on locomotor activity, growth and gonadal development in Nile tilapia (Oreochromis niloticus) fingerlings. A completely randomised design was used, with five treatments (0L:24D, 6L:18D, 12L:12D, 18L:6D and 24L:0D) and four replicates, with the aquarium as the experimental unit. One hundred and sixty fingerlings of tilapia weighing 3.21±0.05 g and measuring 4.35±0.07 cm each were distributed among 20 aquaria of 20 L in a recirculation system with the temperature controlled to 27 °C, with eight fish per aquarium. Feeding was carried out twice daily for 75 days, with extruded feed containing 40% crude protein. The fingerlings subjected to a photoperiod of 12L:12D as well as those under 18L:6D and 24L:0D showed the greatest locomotor activity, whereas those under 6L:18D and 0L:24D showed the lowest activity. Fish subjected to a photoperiod of 18L:6D and 24L:0D showed the highest levels of performance. However, manipulation of the photoperiod did not influence the gonadal development, survival or the appearance of deformities in juvenile Nile tilapia. Under long photoperiods (18L:6D and 24L:0D), fish direct their energy to somatic growth and induce best feed efficiency.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013001200002
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1516-35982013001200002
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.42 n.12 2013
Fonte: | info:eu-repo/semantics/openAccess