本研究於澎湖東南 (北溝) 海域利用拖網進行魚類採集，並針對所捕獲的魚種作定性及定量分析，種類鑑定之後，利用歧異度指標 (H′)、均勻度指標 (J′)、相似度分析、群聚分析、空間排序、環境因子及生態利用率 (EUE) 等方法來推測其種類組成及群聚結構特性。共計採集到63科121種 32,787 尾魚類，主要之優勢種為花身鰏 (Leiognathus rivulatus) 14,034尾，佔總漁獲尾數的42.8%，其次為日本發光鯛 (Acropoma japonicum) (21.5%)、秋姑魚 (Upeneus japonicus) (15.7%)、長蜥魚 (Saurida elongata) (4.7%) 與六斑刺河魨 (Diodon holocanthus) (2.6%) 等。CPUE介於13.4 ~ 55.3 kg/h之間，採集期間以2008年9月的55.3 kg/h 最高，2008年10月的13.4 kg/h最低；物種之月別歧異度為0.650 ~ 2.247，平均值1.552 ± 0.631；均勻度 0.180 ~ 0.618，平均值0.423 ± 0.165。底拖魚類生態利用率值為0.520，丟棄漁獲重量佔總漁獲量的47.9%；魚類群聚結構在時間與空間因素上並沒有顯著差異。另豐度∕生物量曲線指標顯示，豐度在生物量之上，意即底拖漁撈作業對澎湖東南方海域漁場造成壓力。
|標題title(英)：||Biological Community Structure of Bottom Trawling Fishery in the Southeastern Waters of Penghu|
|作者 auther(英)：||Chin-Sui Chung, Yi-Yueh Shean, Wen-Ching Hwang, Shiow-Mei Lin, Lih-Zhen Ou, Jing-Yi Zheng and King-Jung Lin|
|摘要abstract(英)：||This research was conducted from April 2008 to March 2009 in the southeastern waters of Penghu. Data for qualitative and quantitative analysis were collected by trawlers. After the species were identified, the diversity index, evenness, similarities, cluster, ordination, ecological use efficiency, environmental factor and method of interference were used to evaluate species composition and community structure characteristic.
A total of 32,787 individuals of fish belonging to 63 families and 121 taxa was collected. The five most dominant taxa were Leiognathus rivulatus (42.8%), Acropoma japonicum (21.5%),Upeneus japonicus (15.7%), Saurida elongata (4.7%), and Diodon holocanthus (10.6%). The CPUE ranged from 13.4 to 55.3 (kg/h) with the maximum occurring in September 2008 and the minimum occurred in October 2008. The monthly diversity indexes were between 0.650 and 2.247, and the average was 1.552 ± 0.631. The evenness values ranged between 0.180 and 0.618 with an average of 0.423 ± 0.165. The estimated ecology utilization efficiency was 0.520, and the weight of discarded fish accounted for 47.9% of the total catch. In conclusion, in the southeastern waters of Penghu, there were no significant differences in the fish group structure for time and space factors. In addition, the ABC curve of the observed station showed that abundance was over biomass. The study suggested that the bottom trawling operation had caused a great stress on the fishing ground.