A review of nontraditional biomanipulation.

Area of Science:

• Aquatic Ecology
• Environmental Management
• Fisheries Science

Background:

• Traditional biomanipulation faces challenges like high costs and difficulties in reducing nutrient levels and restoring macrophytes.
• In hypereutrophic waters, cyanobacterial blooms disrupt the grazing pressure of large zooplankton.
• Effective control of nuisance algae requires exploring alternative biotic manipulation strategies beyond zooplankton grazing.

Purpose of the Study:

• To review nontraditional biomanipulation techniques for improving water quality.
• To identify challenges and patterns associated with biomanipulation success.
• To extract recommendations for effective lake management strategies.

Main Methods:

• Review of existing literature on biomanipulation, including enclosure experiments and large-scale lake observations.
• Analysis of factors influencing the success of biomanipulation, such as phytoplankton community composition and nutrient levels.
• Case studies examining the effectiveness of specific species, like silver and bighead carp, in managing algal blooms.

Main Results:

• Nontraditional biomanipulation using phytoplanktivorous fish can be effective in highly productive, eutrophic tropical lakes.
• Silver carp (Hypophthalmichthys molitrix) and bighead carp (H. nobilis) have shown success in suppressing Microcystis blooms in specific lake systems.
• The success of biomanipulation is significantly influenced by the initial phytoplankton community composition and nutrient status of the water body.

Conclusions:

• Nontraditional biomanipulation is most appropriate for targeting nuisance blooms of large algal species in eutrophic systems lacking sufficient herbivorous zooplankton.
• This approach is less effective in less eutrophic systems where nanophytoplankton prevails.
• Successful implementation requires careful consideration of lake-specific conditions, including nutrient levels and existing plankton communities.