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Effect of Feed Delivery Rate and Pellet Size on Rearing Performance, Feed Wastage and Economic Profitability in Gilthead Seabream (Sparus Aurata) Ongrowing
Water ( IF 3.4 ) Pub Date : 2020-03-27 , DOI: 10.3390/w12040954
Felipe Aguado-Giménez

Gilthead seabream (Sparus aurata) displays a particular eating behaviour that involves considerable oral manipulation and feed waste. We assess the influence of feed delivery rate and pellet size on seabream growth and size variability, feed wastage and economic profitability for a full production cycle. Batches of seabream were fed twice a day according to three different treatments (T1, T2, T3). T1 and T2 fish were fed with the same regime of pellet sizes: 2 mm pellets until the fish reached 0.1 kg, and 4 mm pellets from then on; the feeding rate in T1 was twice that of T2 (20 and 10 g min−1, respectively). T3 fish were fed with pellets of 2 mm until they reached 0.07 kg, with pellets of 4 mm until the fish reached 0.22 kg, and with 6 mm pellets from then on, with a feeding rate of 10 g min−1. T2 showed increased growth, low variability in fish size during the ongrowing and at harvest, less feed wastage both related to the delivery and the chewing behaviour, lower feed costs and improved profitability. Seabream wasted more feed during the second meal. Controlling the feeding process is essential to reduce wastage and increase profitability, which can be achieved by process monitoring and suitable feed pellet management.

中文翻译:

饲料输送率和颗粒大小对金头鲷(Sparus Aurata)养成养殖性能、饲料浪费和经济效益的影响

金头鲷(Sparus aurata)表现出一种特殊的饮食行为,涉及大量的口腔操作和饲料浪费。我们评估饲料输送率和颗粒大小对鲷鱼生长和大小可变性、饲料浪费和整个生产周期的经济盈利能力的影响。根据三种不同的处理(T1、T2、T3)每天饲喂两次鲷鱼批次。T1 和 T2 鱼用相同的颗粒大小喂养:2 毫米颗粒,直到鱼达到 0.1 公斤,从那时起 4 毫米颗粒;T1 中的进料速率是 T2 的两倍(分别为 20 和 10 g min-1)。T3 鱼用 2 mm 的颗粒喂养,直到它们达到 0.07 kg,用 4 mm 的颗粒喂养,直到鱼达到 0.22 kg,然后用 6 mm 的颗粒喂养,喂食率为 10 g min-1。T2显示增长增加,在养成和收获期间鱼的大小变化小,减少与交付和咀嚼行为相关的饲料浪费,降低饲料成本并提高盈利能力。鲷鱼在第二餐中浪费了更多的饲料。控制饲喂过程对于减少浪费和提高盈利能力至关重要,这可以通过过程监控和适当的饲料颗粒管理来实现。
更新日期:2020-03-27
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