23.3 Results and Discussion
Beam trawl fishing activities are conducted in the north of the Romanian coastline,
between Cape Midia and Portita, at depths between 20 and 29 m (Fig. 23.5).
As vessels fishing for rapa whelk are not equipped with refrigeration rooms for
keeping catches under the optimum conditions, the duration of fishing trips is
limited to a maximum 1–3 days, depending on hydroclimatic conditions and vessel
capacity.
Generally, the duration of one towing does not exceed 60 min, the horizontal
opening to the mouth of the beam trawl has a constant value of 5 m and towing
speed is around 2.8 knts (1.23 m/s). Under such circumstances, the area covered
during one haul with a beam trawl is A ¼ 0.022 km
2 . The length of the wire during
towing is 2.5–3 times greater in relation with the water depth. Catches range from
60 to 100 kg to max. 1500 kg (Fig. 23.6).
Fig. 23.1 Boats used by
divers for manual R. venosa
harvesting: length of 10.5 m
(a) and 7 m (b) (original)
400
G. T ¸ iganov et al.
Beam trawl fishing activities are conducted in the north of the Romanian coastline,
between Cape Midia and Portita, at depths between 20 and 29 m (Fig. 23.5).
As vessels fishing for rapa whelk are not equipped with refrigeration rooms for
keeping catches under the optimum conditions, the duration of fishing trips is
limited to a maximum 1–3 days, depending on hydroclimatic conditions and vessel
capacity.
Generally, the duration of one towing does not exceed 60 min, the horizontal
opening to the mouth of the beam trawl has a constant value of 5 m and towing
speed is around 2.8 knts (1.23 m/s). Under such circumstances, the area covered
during one haul with a beam trawl is A ¼ 0.022 km
2 . The length of the wire during
towing is 2.5–3 times greater in relation with the water depth. Catches range from
60 to 100 kg to max. 1500 kg (Fig. 23.6).
Fig. 23.1 Boats used by
divers for manual R. venosa
harvesting: length of 10.5 m
(a) and 7 m (b) (original)
400
G. T ¸ iganov et al.