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4 results for “Beam Trawl”
Figure. Sampling stations (BS: beach seine, BT: beam trawl). in Length-weight relationships of forty-nine fish species from shallow waters of Gökçeada Island, northern Aegean Sea
Figure. Sampling stations (BS: beach seine, BT: beam trawl).
Data from: Internal injuries in marine fishes caught in beam trawls using electrical versus mechanical stimulations
<p><span>To improve the ecological and economic sustainability in the Dutch beam trawl fishery, tickler chains were replaced by electrical pulse stimulation to drive sole (<em>Solea</em> <em>solea</em>) out of the seabed. Because electrical stimulation may cause internal injuries, we quantified this risk by sampling fish species from commercial beam trawlers and recording spinal injuries and haemorrhages from X-radiographs and autopsy. To distinguish mechanically and electrical-pulse-induced injuries, we compared injuries in ten species sampled from pulse (PUL) and tickler-chain (TCK) trawlers and four species sampled from PUL trawlers with the stimulus switched on or off. Co-occurrence of a major spinal injury and major haemorrhage at the same location was only observed in PUL samples, and were frequently (40%) observed in cod (<em>Gadus</em> <em>morhua</em>) and in low numbers (0–2%) in whiting (</span><span><em>Merlangius</em> <em>merlangus</em>)</span><span>, grey gurnard (<em>Eutrigla</em> <em>gurnardus</em>), and greater sandeel </span><span>(<em>Hyperoplus</em> <em>lanceolatus</em>),</span><span> but not in flatfishes and other species. In cod, injury occurrence correlated with fish length, with lower probabilities for small fish. Major spinal injury or major haemorrhage occurrence in PUL (range: <1–16%) was lower than in TCK (range: <1–42%) in eight of the ten species studied. Population-level consequences of pulse-induced injuries are considered negligible.</span></p>
Data from: Internal injuries in marine fishes caught in beam trawls using electrical versus mechanical stimulations
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Cumulative and average beam and pelagic trawling fishing hours in the Adriatic Sea for the period 2015-2022
<p>An enhanced version of the R4AIS workflow (Galdelli et al., 2021) was used to process T-AIS data, with a poll frequency of 5 min, of fishing vessels operating in the Adriatic Sea during 8 years (2015-2022). Data of vessels categorized as beam trawlers and pelagic trawlers were aggregated to obtain cumulative (fahs) and average (mfahs) fishing hours by fishing category at 0.1°.</p> <p>Maps of beam and pelagic trawling fishing activity were created at 0.1°.</p>
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