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    Öğe
    Gillnet selectivity for bogue boops boops caught by drive-in fishing method from Northern Eagean Sea, Turkey
    (2009) Ayaz, Adnan; Kale, Serkan; Cengiz, Ozgur; Altinagac, Ugur; Ozekinci, Ugur; Öztekin, Alkan; Altin, Aytac
    This study was carried out in six different stations in the Northern Aegean Sea between February-May 2008. In the study, the three different fishing nets which were intensively being used by the region fishermen, the net height of which was 105 meshes and the mesh sizes of which were 44, 46 and 50 mm. In the operations performed with the drive-in fishing method, 5867 and 740 kg fish pertaining to the total 30 species were caught and 4791 were got from bogue being the target species. This value composes of approximately 82% of the total catching. SELECT method was used to fit gill net selectivity curves. Log normal model gave the best fit for the bogue selection. It was observed that modal length and spread values increased as far as the net mesh grew. It was determined that the length groups of bogue individuals we got in our study were quite above the first reproduction length. For this reason, it was seen that the gillnets used in the region did not create fishing pressure over the population. © Medwell Journals, 2009.
  • [ X ]
    Öğe
    Gillnet Selectivity for Bogue Bopps boops Caught by Drive-in Fishing Method from Northern Eagean Sea, Turkey
    (Medwell Online, 2009) Ayaz, Adnan; Kale, Serkan; Cengiz, Ozgur; Altinagac, Ugur; Ozekinci, Ugur; Öztekin, Alkan; Altin, Aytac
    This study was carried out in six different stations in the Northern Aegean Sea between February-May 2008. In the study, the three different fishing nets which were intensively being used by the region fishermen, the net height of which was 105 meshes and the mesh sizes of which were 44, 46 and 50 mm. In the operations performed with the drive-in fishing method, 5867 and 740 kg fish pertaining to the total 30 species were caught and 4791 were got from bogue being the target species. This value composes of approximately 82% of the total catching. SELECT method was used to fit gill net selectivity curves. Log normal model gave the best fit for the bogue selection. It was observed that modal length and spread values increased as far as the net mesh grew. It was determined that the length groups of bogue individuals we got in our study were quite above the first reproduction length. For this reason, it was seen that the gillnets used in the region did not create fishing pressure over the population.
  • [ X ]
    Öğe
    Kuzey Ege denizinde kupez uzatma ağlarının av kompozisyonu, seçiciliği ve hedef dışı av oranları
    (Çanakkale Onsekiz Mart Üniversitesi, 2008) Kale, Serkan; Ayaz, Adnan
    Bu çalışmada, Kupez Balığı (Boops boops L., 1786) için boy seçiciliği, tesadüfi av ve discard av oranları; 22, 23 ve 25 mm göz genişliğine (fabrika çıkış boyu) sahip galsama ağlarıyla toplanan örneklerden saptanmıştır. Örnekler Şubat 2007 ? Mayıs 2008 tarihleri arasında Gelibolu Yarımadası kıyılarında 6 istasyondan alındı.Kupez balıkları için belirlenen boy aralığı 21,3 ? 26,5' tir. Kupez balıkları için optimum yakalanma boyu 22, 23 ve 25 mm göz genişliğine sahip ağlarda sırasıyla 22,7 cm, 23,4 cm ve 25,42 cm'dir. Hesaplanan seçicilik faktörü ve standart sapması sırasıyla 5,08 ile 0,88' dir. Hedev av, tesadüfi av ve ıskarta av oranları sırasıyla % 82,82, % 15,44 ve % 1,75 olarak belirlenmiştir.