The present research was conducted to investigate the effects of fish oil (FO) substitutions with corn oil (CO) on the gonad development of female Tor tambroides broodstocks, a high value freshwater fish. Three isonitrogenous (450 g kg⁻¹ crude protein) and isolipidic (105 g kg⁻¹ crude lipid) were formulated to contain FO and CO at a ratio of 1:0, 1:1 and 0:1, respectively, and fed to female fish (n = 10 fish × 3 replicate × 3 treatment; average weight = 910.0 ± 130.0 g) for five months. At the end of the feeding trial, there were no significant differences (p > .05) on the gonadosomatic index (GSI), hepatosomatic index, 17β-oestradiol (E2) concentration and muscle fatty acids (FA) composition. However, fish fed with diet containing FO to CO at a ratio of 1:1 demonstrated higher percentage of GSI, E2 concentration (ng ml⁻¹) and the presence of vitellogenic oocytes in the histological data compared to the other two feeding diets. The FA composition also highlighted that T. tambroides broodstocks can elongate polyunsaturated FA to highly unsaturated FA. Based on these preliminary results, it shows that T. tambroides prefer diets with supplementation of both n3 and n6 oil source. However, more studies need to be done to strengthen this conclusion.

中文翻译：

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饲料鱼油和玉米油对人工饲养的马海鱼（Tor tambroides）亲鱼的性腺体和肝体指数、性腺组织学、17β-雌二醇水平和脂肪酸谱的影响

本研究旨在研究用玉米油 (CO) 替代鱼油 (FO) 对雌性Tor tambroides亲鱼（一种高价值淡水鱼）性腺发育的影响。将三种异氮（450 g kg ^-1粗蛋白）和异脂（105 g kg ^-1粗脂）配制成分别含有比例为 1:0、1:1 和 0:1 的 FO 和 CO，并喂入雌性鱼（n  = 10 条鱼 × 3 重复 × 3 处理；平均重量 = 910.0 ± 130.0 g）五个月。在喂养试验结束时，没有显着差异（p > .05) 对性腺体指数 (GSI)、肝体指数、17β-雌二醇 (E2) 浓度和肌肉脂肪酸 (FA) 组成的影响。然而，与其他两种喂养饮食相比，用含有 FO 与 CO 比例为 1:1 的饮食喂养的鱼在组织学数据中表现出更高的 GSI 百分比、E2 浓度 (ng ml ^-1 ) 和生卵白卵母细胞的存在。FA 组合还强调了T . tambroides亲虾可以将多不饱和脂肪酸延长至高度不饱和脂肪酸。基于这些初步结果，它表明T . tambroides更喜欢补充 n3 和 n6 油源的饮食。然而，需要做更多的研究来加强这一结论。