The effects of trawl codend mesh size selectivity on the length composition of catches of pandora, Pagellus erythrinus L. 1758 in the shelf area of the Montenegrin coast (South Adriatic)

Selectivity curves of pandora (Pagellus erythrinus, L. 1758) have been estimated in the area of the Montenegrin shelf (South Adriatic), for trawls with bar mesh sizes of 13.5, 16.1, 17.5, 22 and 35 mm (according to national legislation in Montenegro bar mesh size is measured from knot to knot which...

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Veröffentlicht in:Acta Adriatica 2009-01, Vol.50 (2), p.151-157
Hauptverfasser: Joksimovic, A, Regner, S, Sacchi, J
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Sprache:eng
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Zusammenfassung:Selectivity curves of pandora (Pagellus erythrinus, L. 1758) have been estimated in the area of the Montenegrin shelf (South Adriatic), for trawls with bar mesh sizes of 13.5, 16.1, 17.5, 22 and 35 mm (according to national legislation in Montenegro bar mesh size is measured from knot to knot which is, according to Commission Regulation (EC) No. 129/2003, stretched mesh size divided by 2). Although the existing national legislation prescribes that the minimum mesh size of the trawl be not smaller than 20 mm, trawls with forbidden mesh sizes are often used in this area. Results obtained showed that meshes smaller than 20 mm (13.5 mm, 16.1 mm, 17.5 mm) catch large numbers of immature individuals, since the length of 50% retention (L50%) for all these meshes is smaller than the length of fish at first spawning and which is, for Pagellus erythrinus in Montenegrin waters,- 12 cm. L50% is longer than the average length of the first spawning only for nets with openings of 22 mm and 35 mm bar mesh size.Original Abstract: Krivulje selektivnosti arbuna (Pagellus erythrinus, L. 1758) procjenjivane su na kontinentalnoj podini crnogorskog primorja koristenjem dubinskih povlacnih mreza (koca) cija je velicina oka na saki mreze iznosila 13.5 mm, 16.1 mm, 17.5 mm, 22 mm i 35 mm, (mjereno od cvora do cvora). Rezultati istrazivanja pokazuju kako su se mreze, cija minimalna velicina oka na saki ne smije biti manja od 20 mm, na ovom podrucju upotrebljavale i sa manjim velicinama oka od propisane. Rezultati dobiveni istrazivanjima pokazuju da su mreze cija je velicina oka bila ispod 20 mm (zakonom propisana minimalna velicina oka) lovile izrazito veliki broj spolno nezrelih jedinki, a 50% duzina zadrzavanja u mrezi (L50%) za navedene mreze bila je ispod duzine kod koje nastupa prva spolna zrelostost kod ove vrste (12 cm). Za mreze cija je velicina oka bila veca od 20 mm, duzina L50% bila je veca od duzine pri kojoj nastupa prva spolna zrelost. Provedena istrazivanja potvrduju opravdanost reguliranja velicine oka na pridnenim povlacnim mrezama kao jednog od kljucnih cimbenika zastite nedoraslih primjeraka, te samim time i osiguravanja dugorocno odrzivog iskoristavanja obnovljivih bogatstava mora.
ISSN:0001-5113
1846-0453