Lin Tingting, Li Siping, Zhang Dong, Liu Xin, Ren Yuanhao
Key Laboratory of Inland Saline-Alkaline Aquaculture, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China.
Wenchang Innovation Research Center, Fengjiawan Modern Fishery Industry Park, Wenchang 571300, China.
Biology (Basel). 2024 Oct 10;13(10):807. doi: 10.3390/biology13100807.
Seahorses are increasingly regarded as a promising farming object suitable for recirculating aquaculture systems (RASs) due to their high economic value. However, reports on the large-scale farming of seahorses in RASs are rare, and some key parameters, such as stocking densities, are still unclear. In the present study, we employed the lined seahorse (), for which large-scale farming has been achieved, to determine the suitable stocking density for three different-sized juveniles in RASs. The three different-sized juveniles had body heights of 4.0, 7.0, and 9.0 cm, and their test density gradients were 1.0, 0.8, 0.6, and 0.4 inds/L; 0.6, 0.5, 0.4, and 0.3 inds/L; and 0.4, 0.3, 0.2, and 0.1 inds/L, respectively. The juveniles were cultivated for one month, and then their survival, growth, and plasma cortisol and brain serotonin contents (two stress-related indicators) were analyzed. The results show that, regardless of the size of the juveniles, a high density can inhibit growth and trigger stress responses. In addition, for small- (4.0 cm) and medium-sized (7.0 cm) juveniles, a high density can also exacerbate size heterogeneity and cause death. Taking into account the welfare and yield of farmed seahorses, the present study suggests that the suitable stocking densities for 4.0, 7.0, and 9.0 cm juveniles in RASs are 0.6, 0.4, and 0.2 inds/L, respectively.
由于海马具有较高的经济价值，它们越来越被视为适合循环水养殖系统（RASs）的有前景的养殖对象。然而，关于在RASs中大规模养殖海马的报道很少，一些关键参数，如放养密度，仍不明确。在本研究中，我们采用已经实现大规模养殖的斑纹海马，来确定RASs中三种不同大小幼鱼的适宜放养密度。这三种不同大小的幼鱼体高分别为4.0、7.0和9.0厘米，它们的试验密度梯度分别为1.0、0.8、0.6和0.4尾/升；0.6、0.5、0.4和0.3尾/升；以及0.4、0.3、0.2和0.1尾/升。幼鱼养殖一个月后，分析它们的存活率、生长情况以及血浆皮质醇和脑血清素含量（两个与应激相关的指标）。结果表明，无论幼鱼大小如何，高密度都会抑制生长并引发应激反应。此外，对于小（4.0厘米）和中等大小（7.0厘米）的幼鱼，高密度还会加剧大小不均一性并导致死亡。考虑到养殖海马的福利和产量，本研究表明，RASs中4.0、7.0和9.0厘米幼鱼的适宜放养密度分别为0.6、0.4和0.2尾/升。
