1989 - 1989 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Survey : INA K 1/89 (part of Blackwater Herring Survey (FSS: INA K HER))

This survey was undertaken by Cefas as part of the Blackwater Herring Survey (FSS: INA K HER); A series of cruises carried out from 1989 to 2009 each November on the INA-K in the Thames Estuary. The aims of which were to assess the state of herring ( *Clupea harengus* ) stocks through measurements of length samples and by ageing a stratified selection of fish. The latter was also to determine the stock split between North Sea and Thames fish as there is a great deal of mixing of stocks in the area. Stock identification was done by a combination of first year growth observed in the otolith and the maturity stage of the fish. Survey took place between 21/11/1989 and 28/11/1989 on INA K Equipment used during this survey : - Larson Sprat Trawl Survey operations were undertaken on 20 stations 1 different species were caught on this survey