Thames Estuary/River Blackwater Herring Survey (1989-)

The size of the recruiting year class of Blackwater herring is used to review the pre-season TAC. The estimate of recruitment is obtained from the November survey. Approximately 30 hauls are undertaken in the Thames Estuary and River Blackwater. Length measurements of the catch are taken as are otolith samples for age determination. Herring are identified as to stock origin and from this the relative size of the recruiting year class of Blackwater herring is obtained. This is then used to update the seasonal TAC set at the beginning of the fishery, the season opening on 1 October each year.

黑水鲱鱼的招募年度群体规模被用于审视捕捞前季节的TAC（总可捕捞量）。招募量的估计来源于十一月的调查。在泰晤士河三角洲和黑水河中大约进行了30次拖网作业。对捕获物的长度进行测量，并采集耳石样本以确定其年龄。通过对鲱鱼的种群起源进行识别，从而获得黑水鲱鱼招募年度群体的相对规模。该数据随后被用于更新渔业开始时设定的季节性TAC，每年的10月1日为捕捞季节的开启。