Abstract Fishery is one of the main threats faced by sea turtles. However, literature relating to the physiological effects of incidental capture by fishing gears is scarce. The aim of this study is to establish blood reference values for a juvenile population of Chelonia mydas, from Ubatuba- Brazil, and compare them with incidental captured animals by fisheries in the same area, considering seasonal variation. Animals were captured during summer and winter, from direct capture (diving) and incidental capture (pound net and gillnet). Blood samples were collected from 96 healthy green sea turtles and, were analyzed for determining levels of glucose, lactate, total protein, uric acid, albumin, total lipids, triglycerides, VLDL cholesterol, total cholesterol, corticosterone concentrations, total antioxidant capacity, and lipid peroxidation. Corticosterone concentrations were significantly lower in animals captured by diving than in those captured by pound net and gillnet and were thought tso more closely represent baseline levels. Thus, the values found in animals captured by diving were used to establish reference values for this population. Turtles captured in summer had a significant increase in blood levels of glucose, total protein, uric acid, albumin, TBARS, and TEAC; and a decrease in total lipids compared with turtles captured in winter. Although pound nets are considered a low impact fishery to the turtles due to the low mortality rates, seven out of twelve parameters differed significantly from baseline values established for the species. Entanglement in gillnets caused greater perturbations than pound net and all parameters analyzed were significantly different from the reference values. These data indicate that incidental capture causes substantial alterations in health parameters of sea turtles. The results obtained in this study would help in future rehabilitation programs of sea turtles that are captured by fisheries. Additionally, reference values can be used for future comparisons with populations of the same species and with unhealthy and stressed individuals.

中文翻译：

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偶然捕获和季节性对幼年绿海龟（Chelonia mydas）的生理影响

摘要 渔业是海龟面临的主要威胁之一。然而，关于渔具偶然捕获的生理影响的文献很少。本研究的目的是为来自巴西乌巴图巴的 Chelonia mydas 幼鱼建立血液参考值，并将它们与同一地区渔业偶然捕获的动物进行比较，同时考虑到季节性变化。在夏季和冬季捕获动物，包括直接捕获（潜水）和偶然捕获（磅网和刺网）。从 96 只健康绿海龟收集血液样本，并对其进行分析以确定葡萄糖、乳酸、总蛋白、尿酸、白蛋白、总脂质、甘油三酯、极低密度脂蛋白胆固醇、总胆固醇、皮质酮浓度、总抗氧化能力和脂质的水平过氧化。潜水捕获的动物的皮质酮浓度显着低于磅网和刺网捕获的动物，并且被认为更接近代表基线水平。因此，在通过潜水捕获的动物中发现的值被用于为该种群建立参考值。夏季捕获的海龟血液中葡萄糖、总蛋白、尿酸、白蛋白、TBARS 和 TEAC 水平显着升高；与冬季捕获的海龟相比，总脂质减少。尽管由于死亡率低，磅网被认为对海龟的渔业影响较小，但十二个参数中有七个与为该物种建立的基线值显着不同。刺网中的纠缠比磅网引起更大的扰动，并且所有分析的参数都与参考值显着不同。这些数据表明，偶然捕获会导致海龟健康参数发生重大变化。本研究中获得的结果将有助于渔业捕获的海龟的未来康复计划。此外，参考值可用于将来与同一物种的种群以及不健康和压力大的个体进行比较。