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首页> 外文期刊>ICES Journal of Marine Science >Variation in the abundance of sandeels Ammodytes marinus off southeast Scotland: an evaluation of area-closure fisheries management and stock abundance assessment methods
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Variation in the abundance of sandeels Ammodytes marinus off southeast Scotland: an evaluation of area-closure fisheries management and stock abundance assessment methods

机译：苏格兰东南部沿海地区的沙e（Ammodytes marinus）的丰度变化：对禁区渔业管理的评估和种群丰度的评估方法

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In 2000, a sandeel fishery off SE Scotland, which commenced in the early 1990s, was closed in response to concerns that the fishery was having a deleterious effect on seabird breeding performance at colonies in the vicinity of the fishing grounds. Fishery-derived catch per unit effort (cpue) data are used together with three different fishery-independent survey techniques (acoustic, demersal trawl, and nocturnal grab survey) to assess variation in sandeel Ammodytes marinus population biomass in the area over the period 1997-2003, a period that included the last three years that the fishery was operating and the first four years of the sandeel fishing moratorium. Temporal trends in estimates of sandeel biomass derived from these different assessment methods were inconsistent and, on the basis of these alone, it was not possible to determine whether sandeel population biomass in the area had increased following the closure of the fishery. The different survey methods assess different components of the sandeel population; acoustic survey and fishery cpue quantified sandeels active in the water column, whilst demersal trawl survey quantified sandeels buried in the sediments. These data were collected at a time of year when sandeels were moving between the seabed sediments and the overlying water column. A grab survey also quantified sandeels buried in the sediment, but these data were collected at a time of year when the entire population should have been buried in the sediment. Differences between the different time,-series were reconciled by taking account of the cumulative total primary production in each year prior to the surveys. On the basis of this, a model was developed that utilized acoustic and demersal trawl survey data to estimate the total sandeel population biomass. This model was validated using the nocturnal grab-survey data. The modelled data indicated that the biomass of sandeels 1 + years old increased sharply in the first year of the closure and remained higher in all four of the closure years than in any of the preceding three years, when the fishery was operating. The biomass of 0-group sandeels in three of the four closure years exceeded the biomass present in the three years of commercial fishing. Whereas the response of 1 + sandeels may have been a direct consequence of the closure, this is not likely to have been the case in respect of 0-group sandeels. The closure appears to have coincided with a period of enhanced recruit production.
机译：2000年，由于担心该渔业对渔场附近殖民地的海鸟繁殖性能造成了不利影响，于1990年代初开始在苏格兰东南部关闭一个桑德尔渔业。以渔业为基础的捕捞每单位工作量（cpue）数据与三种不同的独立于渔业的调查技术（声学，沉没式拖网和夜间抓捕调查）一起使用，以评估该地区1997-2009年间沙质线虫类海洋生物种群生物量的变化。 2003年，包括渔业运营的最后三年和桑德尔钓鱼禁令的前四年。从这些不同的评估方法得出的沙e生物量估计的时间趋势不一致，仅根据这些方法，就无法确定该地区关闭渔业后该地区的沙biomass种群生物量是否增加了。不同的调查方法评估了Sandeel种群的不同组成部分；声学调查和渔业线索量化了活跃在水柱中的桑德斯，而深海拖网调查则量化了埋在沉积物中的桑德斯。这些数据是在一年中的一段时间内，当桑德尔在海底沉积物和上覆水柱之间移动时收集的。一次抓捕调查还对埋在沉积物中的桑e进行了量化，但是这些数据是在每年应该将整个种群都埋在沉积物中的时候收集的。通过考虑调查之前每年的累计初级总产量来协调不同时间序列之间的差异。在此基础上，开发了一个模型，该模型利用声学和海底拖网调查数据来估算桑德尔种群的总生物量。使用夜间抓地调查数据验证了该模型。建模数据表明，在关闭的第一年中，年龄超过1岁的Sandeels的生物量急剧增加，并且在关闭的所有四年中都比渔业运营的前三年中的任何三年都高。在关闭的四个年中的三年中，0组凉鞋的生物量超过了商业捕鱼三年中的生物量。尽管1 +凉鞋的反应可能是关闭的直接结果，但0组凉鞋的情况却不太可能。停工似乎与新兵生产期增加有关。

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