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Teil C - Annex 
• Example 2: A catch category consists of 994 fish measuring 18-26 cm in length, 3 fish 
measuring 10-12 cm and 3 fish measuring 38—40 cm. A sub-sample of 100 fish can pro 
duce the values 0,10, 20 and 30 for the smallest and largest size categories, that is, under 
rating or gross overrating of numbers. Therefore, here too, both length categories must be 
separated from the middle category and measured separately. The sub-sample must be 
derived from the middle length category and extrapolated to this category. 
In the event of very large catches of one taxon (n > 1,000), the minimum number of the sub 
sample should be doubled in order to ensure that length distribution is represented also with 
regards to extreme values.