Single and multispecies reference points for Baltic fish stocks

被引:88
作者
Gislason, H [1 ]
机构
[1] Danish Inst Fisheries Res, Univ Copenhagen, DK-2920 Charlottenlund, Denmark
关键词
multispecies models; biological reference points; species interaction;
D O I
10.1006/jmsc.1999.0492
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Single and multispecies models are used to examine the effect of species interaction on biological reference points for cod, herring, and sprat in the Baltic. The results demonstrate that reference points are different in single and multispecies contexts. Reference points for fishing mortality based on single-species yield and SSB calculations are difficult to use when natural mortality depends on the absolute abundance of the predators and their alternative prey. Reference points based on maximizing total yield from the system may lead to impractical results when species interact. Multispecies predictions suggest that the cod stock in the Baltic should be reduced to a very low level of biomass in order to benefit from the higher productivity of herring and sprat, its major prey. Such a result stresses the need for incorporating socio-economic considerations in the definition of target reference points. Management advice based on biomass reference points will also differ. In the single species situation the combinations of cod and pelagic fishing effort for which the equilibrium spawning-stock biomass of the three species is above the biomass reference points forms a rectangular area. When biological interaction is taken into account the limits of this area becomes curved. Reference limits for forage fish cannot be defined without considering changes in the biomass of their natural predators. Likewise, reference limits for predators cannot be defined without considering changes in the biomass of their prey. (C) 1999 International Council for the Exploration of the Sea.
引用
收藏
页码:571 / 583
页数:13
相关论文
共 33 条
  • [1] [Anonymous], 1985, Bioeconomic Modelling and Fisheries Management
  • [2] [Anonymous], 1995, COD COND RESP FISH
  • [3] BRANDER K, 1988, FISH POPULATION DYNA
  • [4] Caddy J.F., 1995, FAO FISH TECH PAP, V347, P83
  • [5] *DIR FISH, 1997, YB FISH STAT 1997
  • [6] ELMGREN R, 1984, Rapports et Proces-Verbaux des Reunions Conseil International pour l'Exploration de la Mer, V183, P152
  • [7] FINN JT, 1991, ICES CM 1991 D, V7
  • [8] On the bioeconomics of predator and prey fishing
    Flaaten, O
    [J]. FISHERIES RESEARCH, 1998, 37 (1-3) : 179 - 191
  • [9] Flaaten O., 1988, EC MULTISPECIES HARV
  • [10] GISLASON H, 1991, ICES MAR SC, V193, P50