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BYCATCH DATABASE

Instructions for Users

Two versions of the Bycatch Database, collected by National Resources Consultants, Inc., are presented in one MS-DOS diskette together with a text file (README.TXT) containing this note. The BYCDATAA file includes the complete database with the records organized in 23 fields. The BYCDATAB file is a summary of the complete database, it includes only a part of the records and 10 fields. The databases are in the Excel format (.XLS) but can also be imported in other software.

1. Description of Complete Bycatch Database (BYCDATAA.XLS)

¹ See next page for FAO Fishing Region codes.

²For t he codes of column 4 to 8, see page 12 of the text.

3. Discard Assessment Methodology

If minimum and maximum discard ratios are available, mean discard weights are derived from the average of the minimum and maximum discard weight. If minimum and maximum discard ratios are not available, mean discard weights are derived by multiplying mean discard ratio by harvest weight. In BYCDATAB, ratios in italics are best estimates of discard ratios. Values in bold in Mean Discard Ratio column apply to unidentified (Other) species in each ICCSAAP code and are intended to provide an indication of the level of discarding associated with the subject species group.³ The ratios are the simple averages of observed minimum and maximum values for the same ICCSAAP code. For example, the mean value for ICCSAAP 34 is 0.2948. This was derived from the simple average of 0.022, 0.022, 0.33, and 0.805. The value 0.022 is used twice to account for its application as the minimum and maximum value for horse mackerel in the estimation process. Even though 0.022 was used as the estimate of horse mackerel discard ratios in several FAO regions, it is not used more than twice to derive the unspecified species mean. To use it more than twice would over—emphasize the importance of horse mackerel in the mean estimate, an estimate that is intended to be an index of all ICCSAAP 24 species other than those specified by name.

FAO FISHING REGIONS

³ When BYCDATAB.XLS is imported in other software different from Excel, the italics and boldattribute can be lost.