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1302 C. Ravier and J.-M. Fromentin

Bateau feu

(b) Queue du large 800 m environ Corps de la madrague 351 m

N 1
O 2

3

E 4 (e)
S 5 (d)

6 (e)

5200 m environ(a) PLAN
de la
Queue de terre
MADRAGUE DE BORDJ-KHADIDJA
Mt Si Abdallah
Légende
Bordj Khandidja 1 – Camera di Levante
2 – Bordonarello
3 – Grande
3 – Ingamio
4 – Bordonaro
5 – Bastardo
6 – Camera
7 – Corpo

ECHELLE: 1/10 000

0 50 100 200

Figure 2. Historical representation of the Tunisian trap ‘‘Bordj Khadidja’’, after Parona (1919). The traditional trap was made of
a net from shore to trap (a), which was on average some 3 km long, and a second leader extending offshore from trap (b), and
finally the main trap (c), divided into several compartments. The trap was held by numerous anchors (d). Tuna, hugging the coast
during their spawning migration, were shepherded by the two barrier nets up to the main trap. There, they passed through several
rooms to the final compartment, the ‘‘death room’’ (e), where the floor, made of net, could be lifted. They were then gaffed by
fishers and lifted onto a boat. This simple and efficient fishing technique remained virtually unchanged from the Middle Ages to
the early 20th century.

were published as number of barrels (Sicilian production also included information on the mean weight of the
from the 17th to the early 19th century) or in weight tuna caught. Most traps caught large tuna (>60 kg),
(some of the Tunisian time-series). The records generally i.e. adults on their spawning migration (Pavesi, 1889;