The potential of floating macrophytes as feed and phytoremediation resources to improve the environmental performance of giant gourami production in Indonesia: A life cycle assessment
Résumé
Over the past few decades, Indonesian freshwater aquaculture has intensified, raising many issues on the
associated environmental impacts. In this study, a life cycle assessment (LCA) was used to assess the environ-
mental performance of Indonesian giant gourami (Osphronemus goramy) aquaculture. We compared two con-
trasting fish production systems: a traditional monoculture (MoC) or a co-culture with the macrophyte Azolla
filiculoides used as feed alternative to compounded pellets (CoC). Seven impact categories were considered:
climate change, eutrophication, cumulative energy demand, land occupation, acidification, net primary pro-
duction use (NPPU) and water dependence. The potential impacts were calculated in terms of 1 kg of fish
produced by the systems and were also expressed in terms of surface area (m2 of the farm). Monte Carlo analysis
was carried out to evaluate uncertainties in the assessed impacts based on data uncertainties for the systems.
Results highlighted notable differences between the two production systems. CoC led to less impact relative to
climate change, eutrophication and NPPU per kg of fish produced. These differences were even greater when
reporting the impacts per surface area. Nonetheless, the main contributors of the seven impact categories
remained constant between the two production systems (CoC and MoC). Overall, our findings suggested that
using floating macrophytes as alternative feed resources, even in relatively low proportions, can improve the
environmental performance of giant gourami production.