Improvement can also be sought in feed consumption. The Feed
Conversion Ratio (FCR) is a very well-known term in the aquaculture
sector and the animal production sector in general. In
general, the FCR is defined as the dry weight (kg) of the feed
required to increase the animal biomass by one kg live weight, i.e.
wet weight. Hence, the FCR is a typical G to G term, in which feed is
the only considered input of the production process. In light of C to
G life cycle thinking, this paper introduces a new metric: the CEENE
Feed Conversion Ratio (CEENE FCR). The CEENE FCR is the ratio of
the total CEENE of the added feed for the complete feed production
chain to the exergy content of animal biomass growth (wet weight).
Hence, the CEENE FCR takes the cumulative exergy consumption of
the production of feed into account, i.e. from cradle to feed mill
gate. The FCR and the CEENE FCR are represented in Table 3 for the
hatchery phase, the farm phase and the complete growth cycle
throughout hatchery and farm.