Central Baltic Sea Herring: Effect Of
Environmental Trends And Fishery Management
Author(s)
R. Aps, M. Fetissov, N. Holmgren, N. Norrström & S. Kuikka
Abstract
Uncertainty is an endemic condition of the Baltic Sea herring (Clupea harengus
membras, L) fishery management. It is a condition exacerbated by the fishing
fleet overcapacity and consequent exploitation of the herring stock at a level
believed to be unsustainable. Some sources of uncertainty are mainly related to
biology and fishing technique: the unsolved problem of herring assessment and
management units, the recruitment–environment relationship and the reduction
in mean weights-at-age, uncertain ageing of fish, the problem of unaccounted
fishing mortality caused by the fish selection through the trawl net. Fishing fleet
overcapacity is believed to be behind of the regulatory overfishing when setting
the Total Allowable Catches (TACs) higher than the scientific advice (decision
overfishing) and tolerating the extensive underreporting of catches
(implementation overfishing). Two scenarios for the Central Baltic Sea herring
fishery management options are constructed and the Bayesian networks are used
to represent and update uncertainties encountered in the process of the
management related situation assessment. First scenario represents the current
status of the fishery management resulting in fishing mortality (F) higher than
FMSY – the fishing mortality that corresponds to the Maximum Sustainable Yield
(MSY). The second scenario demonstrates the assumed potential impact of
economic incentives (e.g. zoning, individual transferable quotas (ITQs),
territorial use rights etc.) on the reduction of excessive fishing capacity and
bringing actual fishing mortality closer to FMSY.
Keywords: Central Baltic Sea herring, fishery management, Bayesian belief
network, management scenario simulation, uncertainty communication.
Keywords
Central Baltic Sea herring, fishery management, Bayesian belief
network, management scenario simulation, uncertainty communication
Related Book
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