International (ICES) and national (UK) fish stock and shellfish stock data from 2021 assessment year

The dataset collected includes assessment output relating to the years from
1905 to 2021 inclusive for annual estimates of the following variables for
each stock: the annual recruitment estimate; the stock size (spawning stock
biomass); landings (tonnes of fish brought to shore); catches (tonnes of fish
caught at sea); fishing pressure (a fishing mortality rate); the target
fishing mortality that will achieve maximum sustainable yield in the long term
(Fmsy); upper and lower range estimates for Fmsy consistent with multi-annual
plans and ICES advice; a threshold for spawning stock biomass (MSYB trigger),
below which fishing mortality should be reduced below Fmsy, following the ICES
advice rule, to avoid reduced reproductive capacity; a lower limit threshold
for spawning stock biomass below which there is a high risk of reduced
reproductive capacity (Blim). The stock assessment data for fish and shellfish
stocks of UK interest is used to assess indicators of reproductive capacity
(based on spawning stock biomass) and fishing pressure (based on fishing
mortality). The applicable location for these data differ by stock, but are
relevant to UK stock areas in the Celtic Sea / North Sea / wider North East
Atlantic / Arctic region.

本数据集收录了涵盖1905年至2021年（含）的年度评估输出，涉及以下针对各鱼类种群变量的年度估计值：年度补充量估计；种群规模（产卵种群生物量）；捕捞量（上岸鱼类的吨数）；捕获量（海上捕获的鱼类的吨数）；捕捞压力（捕捞死亡率）；实现长期最大可持续产量的目标捕捞死亡率（Fmsy）；与多年计划和ICES建议一致的Fmsy上下限估计；产卵种群生物量的阈值（MSYB触发器），低于此阈值捕捞死亡率应按照ICES建议规则降至Fmsy以下，以避免繁殖能力的下降；产卵种群生物量以下的高风险下限阈值（Blim）。针对英国感兴趣的鱼类和贝类种群评估数据，用于评估繁殖能力指标（基于产卵种群生物量）和捕捞压力（基于捕捞死亡率）。这些数据的适用位置因种群而异，但与英国凯尔特海/北海/更广泛的东北大西洋/北极地区的种群区域相关。