2010 onwards, Sussex Inshore Fisheries and Conservation Authority (IFCA), Chichester Harbour, Native Oyster Ostrea edulis population monitoring dataset https://portal.medin.org.uk/portal/start.php?tpc=010_62f64310cee8707d9f9d5e82e266edfd In June 2010 the Sussex Inshore Fisheries and Conservation Authority (IFCA), as the local inshore fisheries managers and as member of the Chichester Harbour Oyster Partnership Initiative (CHOPI), teamed up with the local Environmental Health teams of Chichester District Council and Havant Borough Council to gather information on the Native Oyster, Ostrea edulis, population in Chichester Harbour, West Sussex, UK. The Environmental Health teamâ??s sample the oysters from 4/5 sites in the Harbour on a monthly basis for designated bivalve mollusc production area classification. The Sussex IFCA partnership has resulted in additional information being collected during these routine monthly sampling trips in order to monitor relative population density and some population dynamics. The information recorded includes fishing duration, number of hauls, number of oysters below 70mm ring diameter and the number of oysters greater than 70mm ring diameter, thus allowing CPUE to be calculated. In addition, every three months (monthly from November 2013) the biological height and maximum length of each oyster caught is recorded in order to gather information on the size structure of the population. In November 2010 the CHOPI group created three brood stock areas within the Harbour by relaying 2.3 tonnes of Native oysters (all greater than 70mm ring diameter) at high density (approx 30m2). It is hoped that along with monitoring the existing oyster population in the Harbour this sampling regime will provide some indication as to the success of this relaying initiative with regards to any increase in recruitment. Breeding success was monitored through the summer of 2011. In October 2013, 1.7 tonnes of native oysters were relaid at three sites. One of the sites has been monitored monthly using an underwater video and the other two sites will be/were monitored quarterly for mortality, density and breeding success in the summer. 20120828