Predicting the Size Selectivity Based on the Striped Red Mullet Morphology (Mullus surmuletus) in Bottom Trawl Fisheries
Makaleler > Tam Makale · 2017
Yazarlar: Kostak, Enis Noyan; Department of Fisheries, Ege University, Graduate School of Natural and Applied Science, İzmir, Turkey, Adnan TOKAÇ
\n Volume: 33, Issue: 3\n 90-95\n \n, Uluslararası, 2017
Özet
DOI: 10.26650/ASE201817The striped red mullet (Mullus surmuletus)is a commercially important demersal species caught by mixed trawl fishing inthe Mediterranean Sea. Although it is not among the target species of bottomtrawl operations, the striped red mullet is an important species due to itshigh commercial value in trawl catch composition. The primary target is tocatch adult individuals while allowing the immature and juvenile fish to escapefor sustainable fisheries using selective fishing gears. Various selectivitystudies regarding trawl codends aimed at improving selectivity have beencarried out in the past two decades. However, the selectivity sea trialsgenerally require a great deal of work, time, and labor on the deck and arealso expensive. Therefore, instead of experimental-based selectivity studies,simulation-based studies (i.e., the FISHSELECT methodology) were recentlystarted to predict the size selectivity of species in bottom trawl fisheries.In this study, sampled individuals of the striped red mullet were used inmorphological measurements, fall-through experiments, and simulation phases.Diamond mesh sizes of 40, 44, and 50 mm and a square mesh size of 40 mm ofbottom trawl codends were simulated, and the L50 values were calculated as9.87, 10.75, 12.19, and 12.3 cm for the aforementioned mesh sizes,respectively. Design guides were then created for various mesh sizes andopening angles. The study results were compared with those of previous studieson the red mullet (M. barbatus) that were conducted using the FISHSELECTmethodology, and the selectivity results of these two species were found to besimilar.