L. D. Oliveira, Bianca Gomes da Silveira, Edileno Tiago de Sousa Nascimento, Bruno José Corecha Fernandes Eiras, L. B. de Moura, A. L. Salaro, C. Cordeiro, D. A. Campelo
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引用次数: 0
摘要
研究了不同盐碱水(0、3和6 g L-1)和放养密度(10、15和20只L-1)对大黄颡鱼幼虫养殖的影响。试验设计完全随机化,采用3x3析因设计,设3个重复。为此,在27个水族箱(1L)中,按不同的处理方式,随机分配405只小绥螨幼虫,15 d后对所有幼虫进行测量、称重和计数。在3 g L-1盐碱水浓度下,不同放养密度下的大纹夜蛾幼虫终长、增长和特定生长率均高于对照组(p < 0.05)。最终体重和增重与长度变化趋势一致,均以添加3 g L-1的咸化水的鱼较高(p < 0.05)。另一方面,6 g L-1的盐水对仔鱼体重均匀性和成活率不利(p < 0.05)。饵料密度为15或20尾L-1时,末重和增重效果最好(p < 0.05)。建议在3 g L-1的盐碱水中放养20个L-1的幼虫。
Salinized water as a strategy for increase stocking density in Heros severus larviculture, an Amazonian ornamental fish
The aim of this study was to evaluate the effect of different salinized water (0, 3 and 6 g L-1) and stocking densities (10, 15 and 20 larvae L-1) in Heros severus larviculture. The experimental design was completely randomized, in a 3x3 factorial design, with three replicates. For this, a total of 405 larvae of H. severus were randomly distributed in 27 aquariums (1L) according to the treatments and after 15 days all the larvae were measured, weighed and counted. Higher values for final length, length gain and specific growth rate were observed in H. severus larvae raised at any stocking density tested at 3 g L-1 of salinized water (p < 0.05). The final weight and weight gain followed the same trend of the length, being higher in fish submitted to 3 g L-1 of salinized water (p < 0.05). On the other hand, the salinized water of 6 g L-1 was detrimental to larvae weight uniformity and survival rate (p < 0.05). The fish stocked at densities of 15 or 20 larvae L-1 presented the best results of final weight and weight gain (p < 0.05). The stocking density of 20 larvae L-1 in salinized water at 3 g L-1 is recommended for H. severus larviculture.