Department of Ichthyology and Aquatic Environment, School of Agricultural Sciences, University of Thessaly, Volos, Greece.
Department of Fisheries and Aquaculture, School of Agricultural Sciences, University of Patras, Mesolonghi, Greece.
PeerJ. 2024 Aug 14;12:e17814. doi: 10.7717/peerj.17814. eCollection 2024.
The aim of this study was to evaluate the effect of starvation and refeeding on the growth and food intake of gilthead seabream () and seabass () and on the growth and nitrogen uptake of glasswort () in a polyculture aquaponic system under 12 ppt salinity for 75 days. Nine small-scale autonomous aquaponic systems were used, each containing 10 gilthead seabreams (average weight of 6.33 ± 0.73 g and average length of 5.73 ± 0.72 cm) and 10 seabasses (5.82 ± 0.77 g and 6.35 ± 0.45 cm), as well as five glasswort plants. Three fish feeding treatments were performed, a control (A), in which fish were fed daily until satiation, and two fasting treatments for 4 (B) and 7 days (C). Fish growth performance was significantly lower ( < 0.05) in the C treatment for both species compared to treatments A and B. Food consumption (FC) and feed conversion ratio (FCR) were significantly higher ( < 0.05) in treatment C. Glasswort growth performance was significantly higher in treatment C ( < 0.05). The results showed that the 4-day food-deprived fish were similar to the control fish by achieving partial compensatory growth. The more extended fasting period (7 days) resulted in significantly lower growth performance. The lipid and nitrogen retention levels in both species were significantly lower in food-deprived fish than in the control fish both before and during compensatory growth. The results suggest that a feeding schedule involving starvation-refeeding cycles is a promising feed management option for these species in polyculture aquaponic systems. The effect of food deprivation was also significantly beneficial ( < 0.05) for the growth performance of glasswort compared to the control treatment.
本研究旨在评估饥饿和再投喂对斜带石斑鱼（）和欧洲海鲈（）生长和摄食量以及对玻璃海蓬子（）生长和氮吸收的影响，采用 12 ppt 盐度的多营养层水产养殖系统进行为期 75 天的试验。使用了 9 个小型自治水产养殖系统，每个系统包含 10 条斜带石斑鱼（平均体重为 6.33±0.73 g，平均体长为 5.73±0.72 cm）和 10 条欧洲海鲈（5.82±0.77 g 和 6.35±0.45 cm），以及 5 株玻璃海蓬子。进行了 3 种鱼类喂养处理，对照组（A）中鱼每天投喂至饱食，2 种禁食处理持续 4 天（B）和 7 天（C）。与处理 A 和 B 相比，两种鱼类在 C 处理中的生长性能均显著降低（<0.05）。在 C 处理中，食物消耗（FC）和饲料转化率（FCR）显著升高（<0.05）。在 C 处理中，玻璃海蓬子的生长性能显著提高（<0.05）。结果表明，4 天禁食的鱼通过实现部分补偿性生长与对照组鱼相似。更长的禁食期（7 天）导致生长性能显著降低。与对照组鱼相比，在补偿性生长前后，两种鱼类的脂质和氮保留水平在禁食鱼中均显著降低。结果表明，在多营养层水产养殖系统中，采用饥饿-再投喂循环的喂养方案是一种有前途的饲料管理选择。与对照组相比，禁食对玻璃海蓬子生长性能的影响也显著有益（<0.05）。
