The contribution to any impact category of medicines
and chemicals other than zeolite, lime and salt was limited.
The environmental impact of most of the products used for
pond preparation was mainly the result of their production
and transport.
The methodology for biodiversity assessment in LCA is
still weak (Curran et al. 2010), and this affects the relevance
of results for related impact categories. We have therefore
not reported in detail on land use, or on terrestrial and
aquatic biodiversity. However, a few comments can be
made in this context. The present biodiversity loss due to
rice fields being converted into ponds is small because both
types of land use have similarly small biodiversity. Land
use changes and the effects of feed production on
biodiversity were not included in the study. One of the