Vinatea Luis, Carbó Ricard, Andree Karl B, Gisbert Enric, Estévez Alicia
Departamento de Acuicultura, Universidade Federal de Santa Catarina (UFSC), Florianópolis 88061-600, SC, Brazil.
Aquaculture Program, Centre de la Ràpita, Institut de Recerca i Tecnología Agroalimentàries (IRTA), Ctra. Poble Nou, km 5.5, 43540 Sant Carles de la Rapita, Spain.
Animals (Basel). 2023 Oct 17;13(20):3234. doi: 10.3390/ani13203234.
European eel () elvers (initial body weight (BW) = 3 g) were raised in triplicate for 60 days in a biofloc system (BFT) at 21 °C. Data from the current first study evaluating this farming technology indicated that European eel elvers adapted well to BFT systems as data on growth performance (specific growth rate = 1.48% ± 0.13 BW/day and FCR = 1.05 ± 0.09) indicated, with production costs using BFT being lower than conventional RAS units. The most critical issues associated with this aquaculture system were the maintenance of the biofloc in tanks by the regular addition of refined sugar (46% C) to keep a relationship for C:N of 20:1, and the prevention of emergence of opportunistic pathogens like the monogenean sp. The overall results of this study in terms of elvers' performance and quality and the composition of the biofloc material and its microbial composition indicated that BFT, which is considered to be one of the most cost-effective, sustainable, and environmentally friendly farming systems due to its zero water exchange and improvement of feed conversion ratio by the dietary contribution of bioflocs, may be satisfactorily used for farming European eels elvers at a density of 2 kg/m. However, further studies are needed to test this technology with older eel stages.
欧洲鳗鲡（）鳗线（初始体重（BW）= 3克）在生物絮团系统（BFT）中，于21℃下一式三份饲养60天。当前第一项评估该养殖技术的研究数据表明，欧洲鳗鲡鳗线能很好地适应BFT系统，生长性能数据（特定生长率 = 1.48% ± 0.13体重/天，饲料系数 = 1.05 ± 0.09）显示了这一点，且使用BFT的生产成本低于传统循环水养殖单元。与该水产养殖系统相关的最关键问题是通过定期添加精制糖（46%碳）来维持水槽中的生物絮团，以保持碳氮比为20:1的关系，以及预防诸如单殖吸虫等机会性病原体的出现。这项关于鳗线性能和质量、生物絮团物质组成及其微生物组成的研究总体结果表明，由于其零水交换以及通过生物絮团的膳食贡献提高了饲料转化率，BFT被认为是最具成本效益、可持续且环境友好的养殖系统之一，可令人满意地用于以2千克/立方米的密度养殖欧洲鳗鲡鳗线。然而，需要进一步研究以在鳗鲡的更老龄阶段测试该技术。
