Environmental Assessment
Volume B-4.3
Mine
Fish and Aquatic Resources
Ambatovy Project
271
January 2006
Table 4.3-9 Potential Effects and Residual Impacts for Aquatic Species
Abundance and Survival
Project
Period
Potential Effects
Mitigation
Residual Impacts
construction
direct mortality and eradication of
important endemic aquatic species
effects on downstream flow and
water quality during construction of
water management infrastructure
effects on aquatic and riparian
habitat during water pipeline and
road construction
local water management
erosion control
reduce disturbance on
Torotorofotsy basin
high magnitude/long-term
modification of fish and aquatic
fauna within the mine disturbance
area
low magnitude / short-term habitat
disturbance of communities during
infrastructure construction
operation
continued loss of aquatic biota
associated with drainages on the ore
bodies
potential change to downstream
aquatic biota as a result of water flow
and water quality changes
reduced viability of maintaining
endemic fish populations in the LSA
and regionally
potential effects on Torotorofotsy
Wetlands biota as a result of
changes to watershed flows and
water quality
water management plan ;
containment ponds
azonal protection area
erosion and sediment
system design
water intake fish
screening
off-site conservation and
preservation initiatives
and research
high magnitude / long-term effect on
aquatic ecosystems within the local
mine disturbance area
low magnitude / medium-term effect
on downstream communities due to
water flow and quality change
medium magnitude / long-term
effect on specific endemic fish
species in the LSA and region
low impact on existing fish and
aquatic communities in the
Torotorofotsy Wetlands
closure
changes in the landscape and
development of surface water
features to support productive
endemic fish populations
development of associated local
industry (i.e., aquarium trade, etc.)
on-site reclamation
/construction of riparian
areas and water bodies
re-introduction of local or
other endemic species
potential control (barriers)
to dispersion of exotic fish
low magnitude / long-term
population and endemic species
recovery
low magnitude /long-term social
benefits
An overall residual impact classification is presented in Table 4.3-10;
environmental consequence scores used the screening system described in
Volume A, Section 7.
