We analysed the carbon stable isotope (δ¹³C) of various organic carbon sources, including particulate organic matter (POM), sediment organic matter (SOM), seagrass and its epiphytes, and compared these results with that of 36 fishes, including 27 types of demersal fishes, 6 types of midwater fishes, and 3 types of surface fishes. Our results indicated that there were significant differences in the characteristics of carbon stable isotopes of different organic carbon sources, with δ¹³C values ranging from −23.35 (POM) to −9.56‰ (seagrass). The range of the δ¹³C value of the fishes was broad, from –21.84‰ (Dendrophysa russelii) to –10.57‰ (Dasyatis akajei), indicating that fishes had a variety of food sources. For 30 of the 36 fish species, including Plotosus lineatus, Gerres erythrourus, Hypodytes rubripinnis, etc, seagrass and its epiphytes were the main contributors. For 23 of the 36 fish species, including Upeneus tragula, Dasyatis akajei, Cheilodipterus quinquelineatus, their recorded body lengths were less than respective lengths of maturity. These findings indicate that seagrass and its epiphytes are important organic carbon sources for most fishes and play a key role in the energy flow of food web in seagrass ecosystems in this study.

我们分析了碳的稳定同位素（δ ¹³的各种有机碳源，包括颗粒有机物（POM），沉积物有机质（SOM），海草和其附生C），并比较这些结果与36种鱼类，包括27种水下鱼类，6种类型的中水鱼类和3种表面鱼类。我们的结果表明，有在不同的有机碳源碳的稳定同位素的特性显著差异，δ ^13个C值范围从-23.35（POM）至-9.56‰（海草）。的δ的范围¹³的鱼的C值是广泛的，从-21.84‰（Dendrophysa russelii）到-10.57‰（魟akajei），表明鱼类有多种食物来源。在36种鱼类中的30种中，包括海螺，gerres erythrourus，红褐藻等，主要是海草及其附生植物。在36种鱼类中，有23种鱼类，包括Up豆，Up鱼（Dasyatis akajei），Che鱼（Cheilodipterus quinquelineatus），其记录的体长小于各自的成熟长度。这些发现表明，在本研究中，海草及其附生植物是大多数鱼类的重要有机碳源，并且在海草生态系统中食物网的能量流中起关键作用。