Stocks with low market value are rarely included in stock assessments because their catch records are generally lacking, thus adding to the already large number of un-assessed fisheries at a global scale. T his deficiency is more evident in the Mediterranean Sea where stock assessments are relatively fewer. A new method (AMSY) has been recently developed to assess stocks for which only abundance trends from scientific surveys are available. The AMSY method was used in the Aegean Sea to assess the status of 74 fish and invertebrate stocks (50 actinopterygians, 4 sharks, 5 rays, 12 cephalopods, and 3 crustaceans) for which catch data are lacking; 20 of them have medium or high market value and are being targeted by fishing fleets, while the remaining 54 are either not targeted, but by-caught and often discarded, or are not exploited at all. Overall, 31 of the 54 non-targeted stocks (57%) were healthy in terms of biomass (B/Bmsy > 1), whereas only 6 of the 20 targeted stocks (30%) were healthy. Of the 23 unhealthy non-targeted stocks, 12 were near healthy (B/Bmsy > 0.75), compared to only 1 of the targeted stocks, whereas 10 non-targeted stocks (19%) and 10 targeted ones (50%) were outside safe biological limits (B < 0.5Bmsy). Cephalopods and crustaceans were generally in a better status compared to fishes. The results confirm that fishing does not only affect commercial stocks, but it may also affect by-catch stocks. In general, stocks that are targeted by fishing fleets are in a worse status in terms of biomass compared to those that are only occasionally collected as by-catch or those that inhabit environments that are not accessible to fishing fleets.

中文翻译：

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利用丰度和恢复力对爱琴海（希腊）74 种未评估底层鱼类和无脊椎动物种群的现状和开发

市场价值低的种群很少被纳入种群评估，因为它们的捕捞记录普遍缺乏，从而增加了全球范围内已经大量未经评估的渔业。这种缺陷在地中海地区更为明显，那里的种群评估相对较少。最近开发了一种新方法 (AMSY) 来评估只有来自科学调查的丰度趋势可用的种群。AMSY 方法用于在爱琴海评估 74 种鱼类和无脊椎动物种群（50 种放线鱼类、4 种鲨鱼、5 种鳐鱼、12 种头足类动物和 3 种甲壳类动物）的状况，但缺乏捕捞数据；其中 20 条具有中高市场价值，正在成为捕鱼船队的目标，而其余 54 条要么不是目标，而是误捕并经常被丢弃，或者根本没有被开发。全面的，54 个非目标种群中有 31 个 (57%) 在生物量方面是健康的 (B/Bmsy > 1)，而 20 个目标种群中只有 6 个 (30%) 是健康的。在 23 只不健康的非目标股票中，12 只接近健康 (B/Bmsy > 0.75)，而只有 1 只目标股票，而 10 只非目标股票 (19%) 和 10 只目标股票 (50%) 处于外部安全生物限度（B < 0.5Bmsy）。与鱼类相比，头足类动物和甲壳类动物通常处于更好的状态。结果证实，捕捞不仅影响商业种群，还可能影响副渔获物种群。一般而言，与那些偶尔作为副渔获物收集的种群或栖息在捕鱼船队无法进入的环境中的种群相比，捕捞船队所针对的种群在生物量方面处于较差的状态。