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Figure 10. Descriptive figure of a large bluefin tuna having marks of Isistius brasiliensis (Arena, 1988).

ALL GEARS 2008 no. = 7879 ALL GEARS 2008 no. = 2997

40,00 25,00
20,00
30,00 15,00
FREQUENCY % 10,00
FREQUENCY %20,005,00
0,00
10,00

0,00

WEIGHT CLASSES (kg) WEIGHT CLASSES (kg)

Figure 11. An example of bluefin tuna weight frequency data collected by scientific observers in one area in the
Central Mediterranean Sea in 2008 (left) and the data as they are reported only by vessels having quota in their
landing declarations and in the official statistics for ICCAT Task II (right).

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