Title: ICES WKFRAME REPORT 2010 Report of the Workshop on Implementing the ICES FMSY framework
Authors: KELLY C.SIMMONDS EDMUND
Publisher: International Council for the Exploration of the Sea
Publication Year: 2010
JRC N°: JRC58233
URI: http://www.ices.dk/indexfla.asp
http://publications.jrc.ec.europa.eu/repository/handle/JRC58233
Type: Articles in books
Abstract: WKFRAME met for 4 days in late March to provide some technical guidelines to as-sist ICES expert groups in the implementation of the ICES MSY concept in advice for 2011. The workshop was attended by scientists from the ICES community, stake-holders from the fishing Industry and environmental interest groups, as well as rep-resentatives from one of ICES clients (EC). The primary area addressed by the group was to provide technical guidelines for the estimation of an exploitation rate based MSY target or if necessary a proxy, which should include; criteria for selection of proxies for Fmsy and criteria for advice when catch forecasts are not available. While the workshop focused on the technical issues related to defining Fmsy proxies, the dis-cussions touched on other issues related to the implementation of an MSY based ad-vice. These issues which include: the role of management plans in relation to MSY based advice, the function and definition of the Btrigger in the ICES implementation of an MSY advice, the definition of Fmsy as a target or limit reference point, and the in-clusion of estimation or implementation errors in the MSY target. The effects of multi species/predator prey interactions on Fmsy targets, requires further consideration. In relation to these issues, for the purposes of generating ICES advice for 2011, practical approaches are proposed by ACOM. With regard to the estimation of Fmsy proxies, the general approach advocated by WKFRAME is to explore the data through a range of methods with different assumptions, to identify the range of plausible candidates. The workshop suggested that EG¿s explore the sensitivity of the estimates of these candidates to uncertainty and assumptions in the model parameters, and finally, where possible, to check the response of the stock to fishing at any proposed target in the long term (through simulation). Technical guidelines in terms of methods, sensi-tivity analyses and things to look out for are detailed in chapter 2 of the report. With regard to the criteria for advice when there is no forecast; the workshop suggests that F advice in relation to putative Fmsy targets should be framed in terms of moving ex-ploitation rates towards the target, rather than specifying a harvest in relation to the current stock status and/or expected short term development of the stock. Thus ad-vice arising from circumstances where there is no short term forecast, has to be seen in the context of a ¿soft¿ evaluation of stock status relative to crudely estimated prox-ies. There are no new methods or techniques proposed in this report, and indeed the most basic equilibrium based methods are those used in the early years of fisheries science. The implementation of guidelines suggested in this report, require some de-gree of ¿expert judgement¿ and (in the cases of simulation) a caution against over interpretation of the results. This leads ultimately to a conclusion that the move to MSY based advice has to be seen as a stepwise process, which will require data ex-ploration and sensitivity analysis by the EG¿s, and a willingness from both ICES and its clients to work with recursively updated targets.
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