Lumpfish (Cyclopterus lumpus) are the target of commercial fisheries in several countries. However, the collection of biological data for stock assessment purposes is both logistically difficult and expensive. The fishery takes place far from major population centres, over a wide geographical area, and, the roe is extracted at sea and the carcass is not landed in the majority of countries where lumpfish is fished commercially. In Iceland, a new regulation was introduced in 2012 making it mandatory to land the carcass, which led to changes within the industry that made the collection of biological data feasible, and a sampling programme was fully implemented by 2014. This study examines the precision of the sampling scheme and looks for areas in which improvements could be made. The female lumpfish landed by the fishery fell into a narrow length distribution, with the majority of fish between 36 and 47 cm total length. Average length of fish caught in the south-west (Faxaflói) was greater than fish caught on the north coast, highlighting the need to sample over the geographical extent of the fishery. A sample size of 20 fish was sufficient for a reasonably precise estimate of the length frequency of the fish caught by an individual boat. Individual boats caught fish of similar size over time, thus repeated sampling of the same boat should not be considered as separate samples. Fish stored on ice lost ~1.5–2.5% of their weight per day. From 2015–2020, measurements were taken from > 18% of the boats targeting female lumpfish; increasing the sampling effort would lead to only small increases in precision. This analysis provides valuable information in which to base future sampling schemes in other lumpfish fisheries.

块鱼（Cyclopteruslumpus）) 是一些国家商业渔业的目标。然而，为种群评估目的收集生物数据在后勤上既困难又昂贵。渔业远离主要人口中心，在广阔的地理区域内进行，并且在海上提取鱼子，在商业性捕捞鲽鱼的大多数国家不上岸。冰岛于 2012 年引入了一项新规定，强制要求将尸体上岸，这导致行业内发生变化，使生物数据的收集变得可行，并于 2014 年全面实施了抽样计划。本研究检查了抽样方案并寻找可以改进的领域。捕捞上岸的雌性鲽鱼落入狭长分布，大多数鱼的总长度在 36 到 47 厘米之间。在西南 (Faxaflói) 捕获的鱼的平均长度大于在北海岸捕获的鱼，这突出表明需要对渔业的地理范围进行采样。20 条鱼的样本量足以对每艘船捕获的鱼的长度频率进行合理精确的估计。随着时间的推移，个别船捕获了相似大小的鱼，因此不应将同一条船的重复采样视为单独的样本。储存在冰上的鱼每天损失约 1.5-2.5% 的体重。从 2015 年到 2020 年，对超过 18% 的以雌性鲽鱼为目标的船只进行了测量；增加采样工作只会导致精度的小幅增加。