Help screen for
Reference data detail

EMW ref. id
"Estimated mean weight" reference id. References are assigned an id m where m is an integer starting with 1 for each EMW id.
The species for which the mean weight is estimated.
Scientific name
The Scientific name for Species.
Lower (or upper) estimated mean weight (EMW)
The lower (or upper) end of the estimated mean weight range that would be estimated for this Species if based on this reference alone.
Used for lower or upper EMW figure?
This indicates whether the fish size data applies to both the lower and upper end of the estimated mean weight range, or just one of them. "Both" means it does e.g. "the average weight is 1-2 Kg". "Upper" means the fish size data applies to the upper end only of the range e.g. "most fish are harvested at less than 1 Kg". "Lower" means the fish size data applies to the lower end only e.g. "fish exceeding 2 Kg are commonly marketed".
EMW method
The derivation of estimated mean weight ranges from different types fish size data are called "methods". Different methods require different types of calculation. For example, estimates based on common lengths require calculations to convert lengths to weights (using length-weight formulae). The type of method used depends on the type of fish size data being used and determines the reliability ranking of the reference.
Length-weight calculations
Set to "more info" (a hyperlink to Screen 5) if length-weight calculations were performed for this reference, blank otherwise. Length-weight calculations are performed if the fish size data used is a length and if sufficient length-weight data is available on
*** Fish Size Quote ***
This is the fish size quoted in the reference.
*** Explanatory notes ***
This provides additional information to the *** Fish size quote ***. It also provides explanation of how the fish size was obtained from the information in the reference where some calculation was performed.

The scientific and common names of the species referred to in the reference are given in this column, where not given in *** Fish Size Quote *** or Reference document. In cases where this scientific name is not given, or differs from the scientific name displayed for this EMW, then explanation is provided e.g. where the reference scientific name and EMW scientific names are synonyms.
The country to which the fish size in particular, or the reference document, relate.
Link to reference
Hyperlink to the reference document. Some of these may no longer be available.
Reference document
Details the reference document e.g. its title.
Reference URL
The internet address from which the reference document was obtained.
Link to Species Summary
Hyperlink to the Species Summary page on for Species. Occasionally this link displays the home page instead of the species summary page. If this happens, enter the scientific name in the "Genus + Species" search field to search for this species.