Selection Criteria

Selecting Species & Country for GAPI Assessment

In order to determine which species and countries to include in the analysis, two thresholds were established. First the analysis was restricted to the top 20 species by mT of production. These 20 species constituted 98.5% of marine finfish aquaculture production by weight in 2007. Secondly a decision about which producing countries to include in the analysis was made. Just as a small number of species comprises the majority of production, the same is true for countries. A species may be produced in a large number of countries, however only a few countries dominate the production. Thus, those countries that comprised the top 90% of production of each of the 20 selected species were included in the analysis. These two decisions resulted in a GAPI assessment that includes 20 marine finfish species and 22 producing countries. Together, these performers comprise 93.7% of 2007 marine finfish production by weight (mT) and 91% by value (USD).

Marine Finfish Production Assessed by GAPI

Treating "NEI" Species

In some cases, the FAO was unable to report 2007 production down to the species level and instead reported production of an aggregate group of species. In these cases, the FAO lists the group as “nei” or “not elsewhere included”. For instance, the FAO 2007 data list “amberjack nei” and “seabasses nei”, indicating that a particular species was not identified.

To determine the actual species of production within these “nei” groups, we cross-referenced each of the “nei” groups that appears among the top 20 species with information on production in that specific country. For instance, FAO reports 41,900 mT of “seabass nei” produced in Turkey. However, assessment of the Turkish aquaculture industry suggests that Turkey’s production is dominated by or is entirely European seabass. Thus, GAPI assumes that the 41,900 mT of “seabass nei” are actually European seabass.

The top 20 marine finfish aquaculture species included five “nei” groups: amberjacks nei, lefteye flounder nei, seabass nei, and porgies/seabreams nei. GAPI assessed these as Japanese amberjack, bastard halibut, European seabass, and red seabream, respectively. Since all of these species appeared elsewhere in the top 20 list, GAPI simply added the production values of each of these species to its counterparts in the top 20 list. Thus, no new species were added to the top 20 list.

GAPI treats one group, “groupers nei”, somewhat differently from the rest. FAO data indicate that “groupers nei” was one of the top 20 species or species groups in production in 2007. However, the proportion of production that each of these species comprises is unclear. Since ecological performance is similar across farmed grouper species, some generalizations can be made. Thus, “groupers” was maintained as a generic group where performance is assumed to be consistent across individual grouper species.