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| Registros recuperados: 26 | |
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| Luz,Ronald Kennedy; Portella,Maria Célia. |
| O experimento foi conduzido com o objetivo de desenvolver técnicas de manejo durante a larvicultura de trairão, realizando cultivos em água doce ou ligeiramente salinizada, utilizando náuplios de Artemia como alimento vivo. No início da alimentação exógena, oito dias após a eclosão, as larvas foram contadas e estocadas em 12 recipientes com volume útil de 1,5 L cada, dotados de sistema de aeração, numa densidade de 10 larvas/L, distribuídos dentro de três tanques de 130 L, contendo água com temperatura controlada (29,5ºC). Os tanques foram totalmente cobertos com lona plástica preta, mantendo o ambiente interno escuro, e descobertos somente para os manejos diários. As larvas foram submetidas a três tratamentos: cultivo em água doce; em água a 2 de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trairão; Hoplias lacerdae; Larvicultura; Salinidade; Canibalismo; Artemia. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982002000400004 |
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| Luz,Ronald Kennedy; Zaniboni Filho,Evoy. |
| Este trabalho foi realizado na Estação de Piscicultura de São Carlos (EPISCar), São Carlos, SC. O efeito da densidade de estocagem de Pimelodus maculatus na larvicultura foi avaliado em pós-larvas alimentadas diariamente com zooplâncton selvagem na proporção de 300 organismos/pós-larva/dia e submetidas aos seguintes tratamentos: T1 - 5 pós-larvas/litro; T2 - 15 pós-larvas/litro; T3 - 30 pós-larvas/litro. No terceiro e quinto dias de experimento, foi avaliada a taxa de sobrevivência. Decorridos três dias de experimento, não foi observada influência da densidade na sobrevivência, embora, no quinto dia de experimento, houvesse maior sobrevivência na menor densidade testada, com valores médios de sobrevivência final de T1 (35,6%), T2 (28,9%) e T3 (20,6%). Os... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Densidade de estocagem; Larvicultura; Mandi-amarelo; Pimelodus maculatus; Pós-larva. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982002000300004 |
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| Luz,Ronald Kennedy; Silva,Walisson de Souza e; Melillo Filho,Reinaldo; Santos,André Eduardo Heringer; Rodrigues,Lucas Alves; Takata,Rodrigo; Alvarenga,Érika Ramos de; Turra,Eduardo Maldonado. |
| The objective of this study was to assess the possibility of increasing the stocking density in the larviculture of Nile tilapia, Oreochromis niloticus, in saline water. Six-day post-hatched larvae (average weight of 0.09±0.002 g), at the start of the exogenous feeding, were stocked in twelve 8 L tanks at densities of 1, 10, 20 and 30 larvae/L. The larvae were fed a diet consisting of 40% crude protein five times per day. During larviculture, water was kept at a salinity of 2 g of common salt/L. At the end of the 28-day experiment, the survival rate, length, weight, temperature, water salinity and conductivity were not affected by the different treatments. The dissolved oxygen and pH, however, decreased as density increased, whereas total ammonia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intensive larviculture; Oreochromis niloticus; Water quality; Water salinity. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001200001 |
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| Luz,Ronald Kennedy; Ribeiro,Paula Adriane Perez; Ikeda,Aline Leite; Santos,André Eduardo Heringer; Melillo Filho,Reinaldo; Turra,Eduardo Maldonado; Teixeira,Edgar de Alencar. |
| The objective of this study was to evaluate the effect of different levels of diet crude protein on the performance and stress resistance rate (Re) of Oreochromis niloticus larvae and fingerlings. In the first experiment, 5, 15 and 25 day-old animals were submitted to 1, 5, 7, 10, 15, 20, 30 and 40 minutes of air exposure on a sieve. In the second experiment, tilapia larvae were fed with 32, 40 and 55% crude protein (CP) diets. Animals after 15 and 30 days of feeding (21 and 36 days of life, respectively) were submitted to the air exposure test for 7 and 10 minutes. Re was estimated based on survival 24 hours after the tests. In the first experiment, it was observed that 5-day-old animals were more resistant than animals with 10 and 20 days of feeding (15... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Air exposure; Feeding; Larviculture; Oreochromis niloticus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000200031 |
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| Luz,Ronald Kennedy; Portella,Maria Célia. |
| The establishment of evaluation parameters for larvae and juvenile quality assessment is highly desirable. The experiment evaluated the Stress Resistance Rate (Re) on Hoplias lacerdae larvae and juveniles. Larvae on the 13th, 16th, 19th, 23rd and 26th days of life were subjected to Re evaluation tests. Twenty animals were stoked in one liter beaker and kept at 27 to 28.5°C. The following treatments were applied: E3 -3 minutes; E5 - 5 minutes; E7 - 7 minutes; E10 - 10 minutes and E15 -15 minutes on drying paper. After 24 hours Re was evaluated. It was observed that Re values showed an increase from 13th to 19th day in all treatments indicating an increasing resistance related to larval development. High Re rates were observed during the whole experiment,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hoplias lacerdae; Fish larvae; Stress resistance. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000500009 |
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| Registros recuperados: 26 | |
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