Single and multispecies reference points for Baltic fish stocks

• DOI: 10.1006/jmsc.1999.0492
• Publication Date: 2002-10-07T16:17:31Z
• Authors: H Gislason
• Keywords: Sprat; Forage fish; Maximum sustainable yield; Baltic sea; Fish stock; Stock (firearms)

Single and multispecies models are used to examine the effect of species interaction on biological reference points for cod, herring, sprat in Baltic. The results demonstrate that different single contexts. Reference fishing mortality based single-species yield SSB calculations difficult use when natural depends absolute abundance predators their alternative prey. maximizing total from system may lead impractical interact. Multispecies predictions suggest cod stock Baltic should be reduced a very low level biomass order benefit higher productivity herring sprat, its major Such result stresses need incorporating socio-economic considerations definition target points. Management advice will also differ. In situation combinations pelagic effort which equilibrium spawning-stock three is above forms rectangular area. When taken into account limits this area becomes curved. forage fish cannot defined without considering changes predators. Likewise,