Laboratório de Aquacultura, Escola de Veterinária, Departamento de Zootecnia, Universidade Federal de Minas Gerais, Universidade Federal de Minas Gerais, Laboratório de Aquacultura. Avenida Antônio Carlos, nº 6627, Belo Horizonte, MG, CEP 31270-901, Brasil.
Trop Anim Health Prod. 2024 Jun 5;56(5):185. doi: 10.1007/s11250-024-04047-2.
This study evaluated the growth and physiological response of proactive and reactive Colossoma macropomum juveniles in a recirculating aquaculture system (RAS). In Phase 1 of the experiment (50 days of cultivation), juveniles, weighing 2.16 ± 0.52 g, were stocked in 12 28-L tanks to test the following treatments: proactive (PT), reactive (RT) and mixed (MT) composed of reactive (MRT) and proactive (MPT) animals. In Phase 2 of the experiment (40 days of cultivation), the animals were transferred to 175-L tanks with the same treatments as Phase 1. The animals were fed twice a day with commercial diet during both phases. After Phase 1, MPT animals showed higher growth than MRT animals (P < 0.05), and higher weight gain and daily weight than PT animals (P < 0.05). After Phase 2, PT animals showed higher weight gain and daily weight gain than RT and MT animals (P < 0.05), as did MPT animals compared to PT animals. Performance for RT animals was superior (P < 0.05) to that of MRT animals. Glucose (P < 0.04) and cholesterol (P < 0.01) were higher for RT animals compared to PT animals. Cholesterol was higher for MPT animals compared to MRT animals (P < 0.01), while plasma protein was lower (P < 0.001). Glucose (P < 0.001) and cholesterol (P < 0.01) were higher for MPT animals compared to PT animals and for MRT animals compared to RT animals (glucose P < 0.02, cholesterol P < 0.01). After 90 days of cultivation, proactive animals cultivated separately presented better performance. When cultivated together, reactive animals experienced a decrease in performance and both stress coping styles showed more signs of stress.
本研究评估了积极型和反应型 Colossoma macropomum 幼鱼在循环水产养殖系统 (RAS) 中的生长和生理反应。在实验的第一阶段（50 天的养殖期），体重为 2.16±0.52g 的幼鱼被放养在 12 个 28-L 水槽中，以测试以下处理：积极型（PT）、反应型（RT）和混合型（MT），由反应型（MRT）和积极型（MPT）动物组成。在实验的第二阶段（40 天的养殖期），动物被转移到 175-L 水槽中，采用与第一阶段相同的处理。在两个阶段，动物都每天喂食两次商业饲料。第一阶段结束后，MPT 动物的生长速度高于 MRT 动物（P<0.05），体重增加和日增重均高于 PT 动物（P<0.05）。第二阶段结束后，PT 动物的体重增加和日增重高于 RT 和 MT 动物（P<0.05），MPT 动物的表现也优于 PT 动物。RT 动物的表现优于 MRT 动物（P<0.05）。与 PT 动物相比，RT 动物的血糖（P<0.04）和胆固醇（P<0.01）更高。与 MRT 动物相比，MPT 动物的胆固醇更高（P<0.01），而血浆蛋白更低（P<0.001）。与 PT 动物和 MRT 动物相比，MPT 动物的血糖（P<0.001）和胆固醇（P<0.01）更高。在 90 天的养殖期结束后，单独养殖的积极型动物表现更好。当混合养殖时，反应型动物的表现下降，两种应激应对方式都表现出更多的应激迹象。
