Data/hora: 01/06/2024 12:11:58

Provedor de dados: | 76
País: | Brazil
Título: | Growth, molt and survival of Palaemonetes argentinus (Decapoda, Caridea) under different light-dark conditions
Autores: | Díaz,Ana Cristina; Sousa,Liliana G.; Cuartas,Elena I.; Petriella,Ana María.
Data: | 2003-09-01
Ano: | 2003
Palavras-chave: | Growth; Molt; Photoperiod; Crustacea; Palaemonidae.
Resumo: | Growth, survival and molting rate in Palaemonetes argentinus Nobili, 1901 were compared under different light-dark conditions. During 80 days, 150 immatures of both sexes (initial mean weight 0.09±0.002g), from Los Padres lagoon, Mar del Plata, Argentina, were maintained in aquaria at 19±0.4°C under three light conditions: 0:24, 10:14 and 13:11 (L-D). They were fed daily on an artificial diet (45% proteins, 17.2% lipids, 7% water, 7% ash). Good weight increment was obtained with the three treatments, finding a positive linear correlation between mean weight and time (0:24, r=0.97; 10:14, r=0.99; 13:11, r=0.98). There were no significant differences in the percentage increment in mean weight among the treatments (0:24, 19.3%; 10:14, 29.3% and 13:11, 26.5%) (p&lt;0.05). Molting rate was significantly higher at a long-day photoperiod (MR=1.7) than at a short-day (MR=0.6) or continuous dark condition (MR=0.3) (p&lt;0.05). The lowest survival was found in animals maintained under 13:11 L-D conditions (77%), being statistically different of the other two treatments (92% and 89% at 10:14 and 0:24, respectively) (p&lt;0.05). These results suggest that the best growth and survival in P. argentinus result with a 10:14 L-D cycle, and that the growth is less affected by photoperiod than molting rate and survival.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212003000300004
Editor: | Museu de Ciências Naturais
Relação: | 10.1590/S0073-47212003000300004
Formato: | text/html
Fonte: | Iheringia. Série Zoologia  v.93 n.3 2003
Fonte: | info:eu-repo/semantics/openAccess