Wedgefishes (Rhinidae) and giant guitarfishes (Glaucostegidae) are amongst the most threatened marine taxa globally. Research was undertaken in Singapore, a globally significant trading hub for shark and ray products, between May 2019 (two months after they were proposed for listing on the Convention on International Trade in Endangered Species of Flora and Fauna (CITES)) and August 2019 (three months before listings entered into force). The study documents the composition of imports and landings, estimates the scale of the trade, describes the supply chain, and analyzes completeness of product labels through surveys in fishery ports and retail markets as well as informal interviews with traders. Of 590 individuals recorded at fishery ports, 215 from six species could be identified to the species-level. Rhynchobatus australiae was the most commonly encountered wedgefish species (66%) while only one species of giant guitarfish (Glaucostegus typus) was recorded. Individuals were primarily claimed to be imported from Indonesia and Malaysia. The high value of wedgefish fins was evident as a large proportion of individuals without fins (66%) were recorded. Businesses in Singapore were utilizing by-products of the fin trade which appeared to have a distinct supply chain. Traders noted declining supplies of wedgefishes and dried shark fins in recent years. Shark and ray products notably lacked information on species and country of origin on their labels. Findings here provide baseline data for determining the effectiveness of new trade controls and suggest that a multi-pronged approach with trade monitoring, additional traceability and labeling requirements, and enhanced fisheries management would conserve globally declining, wild populations.

楔鱼（Rhinidae）和巨型吉他鱼（Glaucostegidae）是全球受威胁最严重的海洋类群之一。研究是在 2019 年 5 月（在提议将它们列入《濒危动植物种国际贸易公约》（CITES）的两个月后）至 2019 年 8 月期间，在全球重要的鲨鱼和鳐鱼产品贸易中心新加坡进行的（上市前三个月）。该研究记录了进口和上岸量的构成，估计了贸易规模，描述了供应链，并通过渔港和零售市场的调查以及与贸易商的非正式访谈来分析产品标签的完整性。在渔港记录的 590 只个体中，有 6 个物种的 215 只被鉴定到物种级别。Rhynchobatus australiae是最常见的楔鱼种类（66%），而只有一种巨型吉他鱼（Glaucostegus typus） 被记录。个人主要声称是从印度尼西亚和马来西亚进口的。楔鱼鳍的高价值是显而易见的，因为记录了很大一部分没有鳍的个体 (66%)。新加坡的企业正在利用鱼翅贸易的副产品，这些副产品似乎具有独特的供应链。贸易商指出，近年来楔形鱼和干鱼翅的供应量下降。鲨鱼和鳐鱼产品的标签上特别缺乏关于物种和原产国的信息。此处的调查结果为确定新贸易管制的有效性提供了基线数据，并表明采用贸易监测、额外的可追溯性和标签要求以及加强渔业管理的多管齐下的方法将保护全球范围内下降的野生种群。