dc.contributor.author | Skagen, Dankert W. | |
dc.date.accessioned | 2012-08-28T13:43:48Z | |
dc.date.available | 2012-08-28T13:43:48Z | |
dc.date.issued | 1991 | |
dc.identifier.citation | This report is not to be cited without prior reference to the author | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/104924 | |
dc.description.abstract | Probability distributions for the recruitment, conditional on the
spawning stock biomass (SSB) were made using a kernel method.
Predictions were made with recruitments according to these
distributions for 10 years, using a Monte Carlo procedure,
assuming constant weight at age, maturity ogive and natural
mortality.
Examples are given for 3 stocks, Western mackerel, North Sea
sandeel and North Sea herring. Three management strategies were
studied, a fixed F, a fixed yearly catch and a regime aiming at
stabilizing the SSB.
Due to the variable recruitment, attempts to stabilize the SSB
increases the year to year variations in the yield. Attempting
to take a fixed catch every year is hazardous, since the
appearance of a few poor year classes may detoriate the stock so
that the future recruitment suffers.
This simple approach may be a useful tool for evaluating
management strategies in terms of risks and possible outcome of
the fisheries. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1991/H:28 | |
dc.subject | stock assessment | no_NO |
dc.subject | bestandsberegning | no_NO |
dc.subject | management advice | no_NO |
dc.subject | forvaltningsråd | no_NO |
dc.title | Stock prediction using stochastic recruitment numbers with empirical stock-dependent distribution | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 | no_NO |
dc.source.pagenumber | 16 s. | no_NO |