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摘要
O objetivo deste estudo foi avaliar a sobreviv那ncia e o crescimento de larvas de surubim, Pseudoplatystoma corruscans, em cinco densidades de cultivo: 15, 35, 55, 75 e 95 larvas/L, distribu赤das em um delineamento inteiramente ao acaso com tr那s repeti es. Utilizou-se 芍gua salinizada (5%) para o cultivo. As larvas foram mantidas em ambiente sem luz e alimentadas com n芍uplios de Artemia sp. na propor o de 500 n芍uplios/larva/dia. Ao final do experimento (10o dia), a sobreviv那ncia apresentou tend那ncia de redu o com oaumento da densidade de estocagem, mas n o se verificou rela o entre o crescimento e a densidade. As concentra es de am nia n o ionizada e de nitrito apresentaram varia o diretamente proporcional ao aumento da densidade e podem ter influenciado a sobreviv那nciafinal. A maior sobreviv那ncia (52,0 ㊣ 9,3%) foi registrada em cultivo com 15 larvas/L, sendo que essa densidade n o produziu efeito negativo sobre a qualidade da 芍gua. The aim of this study was to evaluate the survival and the growth of surubim Pseudoplatystoma corruscans larvae in five stocking densities: 15, 35, 55, 75 and 95 larvae/L, distributed in a completely randomized design with three repetitions. Brackish water (5%) was used in the cultivation. The larvae were cultivated without light and fed with 500 Artemia sp. nauplii/larvae/day. At the end of the experiment (10th day), the survival showed tendency to reduction with the increase of the stocking density, but a relationship between growth and density was not registered. The concentrations of non-ionized ammonia and nitrite varied proportionally to density increase and those concentrations probably influenced the final survival. The highest survival (52.0 ㊣ 9.3%) was registered at 15 larvae/L, a density that did not produce negative effect on the quality of water.
- 出版日期2006
