Abstract Common carp (Cyprinus carpio) is the most farmed freshwater fish worldwide. In recent years, use of natural products in fish diets has become popular in aquaculture, to improve fish health and growth performance. The present study investigated the effects of essential oil from the leaves of Monterey cypress (Cupressus macrocarpa; CMEO) on growth performance and blood parameters in common carp fingerlings. Identification of 96.1% of the CMEO total volatile components was achieved, with the highest contents for terpinen-4-ol and α-pinene, at 22.9% and 47.7%, respectively. After 60 days of feeding of the fingerlings with supplemented diets without CMEO (CMEO 0%) and with CMEO at 0.5%, 0.75% and 1%, the best growth performance was seen for those fish fed with the CMEO 0.5% diet. No significant differences were seen for the haematological parameters and blood cell indices versus CMEO 0%. Serum glucose, triglycerides, cholesterol and glutamic pyruvic transaminase were significantly reduced in the fingerlings fed with the CMEO 0.5% diet versus CMEO 0%. Thus, CMEO oil as a 0.5% dietary supplement can be used to improve the growth performance and health status of the common carp without any adverse effects seen.

中文翻译：

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蒙特雷柏 (Cupressus macrocarpa Hartw) 叶精油作为膳食补充剂对鲤鱼 (Cyprinus carpio L.) 生长性能和血液学和生化参数的影响

摘要 鲤鱼（Cyprinus carpio）是世界范围内养殖最多的淡水鱼。近年来，在鱼类饲料中使用天然产品已在水产养殖中流行起来，以改善鱼类的健康和生长性能。本研究调查了蒙特雷柏（Cupressus macrocarpa；CMEO）叶子精油对鲤鱼鱼种生长性能和血液参数的影响。CMEO 总挥发性成分的鉴定率为 96.1%，其中萜品烯-4-醇和α-蒎烯的含量最高，分别为 22.9% 和 47.7%。用不含 CMEO（CMEO 0%）和 CMEO 0.5%、0.75% 和 1% 的补充日粮喂养鱼种 60 天后，观察到用 CMEO 0.5% 日粮喂养的鱼的生长性能最好。血液学参数和血细胞指数与 CMEO 0% 相比没有显着差异。与 CMEO 0% 相比，CMEO 0.5% 饲料喂养的鱼种的血清葡萄糖、甘油三酯、胆固醇和谷氨酸丙酮酸转氨酶显着降低。因此，CMEO 油作为 0.5% 的膳食补充剂可用于改善鲤鱼的生长性能和健康状况，而不会产生任何不利影响。