Download ECONOMICS WITHIN MULTIDISCIPLINARY RESEARCH

Technical University of Denmark
Danish Institute for Fisheries Research
Danish marine stocking experiments
applying
the Responsible Approach
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Prioritise and select target species for enhancement
• Community survey
• Local experts
In Denmark, fishermen (commercial and recreational)
make suggestions for specific species in specific areas.
OR, aquaculture enterprise make suggestions for releases
Expert group then looks at the potential for restocking
or stock enhancement of the specific species in the
specific area
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Develop a species management plan that identifies
harvest opportunity, stock rebuilding goals and
genetic objectives
• Goals and objectives for restocking or stock
enhancement
• Clearly identified genetic structure and geographic
distribution of the stock
• Production and management objectives need to be
outlined
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Age at release
Magnitude per year
Requirements
Female for broodstock
Capital costs*
Running costs
Area requirement
Scenario I
3-month
26 million
Scenario II
First-feeding
474 million
Scenario III
Eggs
13 billion
406
4.41 mill €
1.93 mill €
Broodstock 594m²,
Egg incubators 108m²,
Live feed production
396m²,
Hatchery 2484m²,
Ongrowing 5355m².
594
341,200 €
204,000 €
Broodstock 594m²,
Egg incubators 30m²,
6,558
1.62 mill €
744,000 €
Broodstock 2078m²,
Egg incubators 356m²,
Running costs: 2 million DKr
Economic analysis
Expected return: 13-20 million DKr
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Define quantitative measure of success
• Set quantitative goals
• Use simple indicators
The Danish Baltic Sea Case Study: Goal of 10%
increase in average year class recruits.
Increase the Spawning Stock Biomass by min. 10%
while < 140.000 tons.
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
Number of 2-year-old recruits
Good environmental
conditions
SSB ca. 65 000 t in 2005
Poor environmental
conditions
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Use genetic resource management to avoid
deleterious genetic effects
• Identify genetic risks and consequences of
enhancement and how to mitigate
• Implement genetic controls in the hatchery and a
monitoring and evaluation program for wild stocks
• Implement a sufficiently large broodstock
• Implement spawning protocols that ensure genetic
biodiversity.
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Use disease and health management
• Establish maximum acceptable levels of infections and parasites
in the hatchery established on the basis of wild stock health
screening results.
BVP monitoring program
established for Danish Baltic Sea
broodstock
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Use an empirical process for defining
optimum release strategies
Trial at 1% increase target.
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
The Responsible approach
Use adaptive management.
Continuous process to improve stocking results
by reviewing all components, some degree of
monitoring and adapting.
New ideas for refining stock enhancement/
restocking constantly considered and
integrated in the management process.
Source: Blankenship & Leber, 1995
Technical University of Denmark
Danish Institute for Fisheries Research
Conclusion
• Dynamic new science where progress is being made
• Broad-based, multi-disciplinary, or “ecosystem
approach” integrating biotechnical with a range of other
considerations, esp. stakeholder involvement and local
choices
• Look at the field critically with risk assessment and costbenefit analysis, with a view to improve it through
integration, monitoring, evaluation, adaptation and
dissemination of information