Just after deployment, the average height of the trammel nets
set in the rocky bottom was lower than that of those set in the
sandy bottomgiven that parts of the nets were immediately trapped
in rocks and thus limited in height. Moreover, the higher number of individuals caught by rocky bottom nets in the early stages
contributed to decrease their average height. Whereas the rocky
bottom nets remained in their original position for a long time,
being held by rocks and protected by them from the effects of
water currents, wave energy caused the spiralling and loss of fishing capacity of sandy bottom nets. However, rocky bottom nets,
although first favoured by their location, ended up disintegrating
as a consequence of their abrasive contact with rocks.