KaydedilenlerDerginizi ekleyin

Dergiler / Turkish Journal of Veterinary and Animal Sciences / 2005 / Cilt: 29 - Sayı: 4

Seasonal Variation in Trawl Codend Selectivity for Annular Sea Bream (Diplodus annularis L., 1758)

Hüseyin ÖZBİLGİN
Zafer TOSUNOĞLU
Adnan TOKAÇ
Gülnur METİN
Sayfa
959–965
Yayın Tarihi
2005-04-01
DOI
—
🏛️Bu makalenin bibliyografik verileri ve tam metin bağlantısı DergiPark üzerinden sağlanmıştır.
DergiPark Kaydı ↗
✨

Yapay Zeka Hızlı Bakış & Çıkarımlar

AI Insight
⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

The results show that although there is a pattern of decrease in selectivity from summer (L50 = 9.3 cm, SR = 0.9 cm) to autumn (L50 = 9.2 cm, SR = 0.9 cm), winter (L50 = 8.9 cm, SR = 1.1 cm) and spring (L50 = 8.7 cm, SR = 1.1 cm), seasonal differences in selectivity for annular sea bream are not very high.

📌 3 Maddede Bu Makale

🎯
Amaç & Hipotez:This study investigated the selectivity of a 40 mm mesh size polyethylene codend commonly used by Turkish demersal trawlers.
📊
Temel Bulgular & Veri:Four sets of data were collected in spring (4-18 April 2002), summer (10-25 July 2002), autumn (26 September-2 October 2002) and winter (22-23 January 2003).
💡
Sonuç & Katkı:The results show that although there is a pattern of decrease in selectivity from summer (L50 = 9.3 cm, SR = 0.9 cm) to autumn (L50 = 9.2 cm, SR = 0.9 cm), winter (L50 = 8.9 cm, SR = 1.1 cm) and spring (L50 = 8.7 cm, SR = 1.1 cm), seasonal differences in selectivity for annular sea bream are not very high.
🔬Tür:Modelleme & Sayısal Simülasyon
📍Kapsam:2002 Verileri
⚙️Değişkenler:Seasonal variation · trawl selectivity · the Aegean Sea

Özet

This study investigated the selectivity of a 40 mm mesh size polyethylene codend commonly used by Turkish demersal trawlers. Seasonal selectivity data were collected for annular sea bream (Diplodus annularis), which is the most abundant discard species in the catch composition in Gülbahçe Bay. Four sets of data were collected in spring (4-18 April 2002), summer (10-25 July 2002), autumn (26 September-2 October 2002) and winter (22-23 January 2003). The selectivity of the same codend was tested under very similar conditions except for the seasonal variables. The data were obtained using the covered codend technique, and analysed by logistic equation with the maximum likelihood method. Parameters of mean curves for each trip were estimated using Fryer's between haul variation model. The results show that although there is a pattern of decrease in selectivity from summer (L50 = 9.3 cm, SR = 0.9 cm) to autumn (L50 = 9.2 cm, SR = 0.9 cm), winter (L50 = 8.9 cm, SR = 1.1 cm) and spring (L50 = 8.7 cm, SR = 1.1 cm), seasonal differences in selectivity for annular sea bream are not very high.

Abstract

This study investigated the selectivity of a 40 mm mesh size polyethylene codend commonly used by Turkish demersal trawlers. Seasonal selectivity data were collected for annular sea bream (Diplodus annularis), which is the most abundant discard species in the catch composition in Gülbahçe Bay. Four sets of data were collected in spring (4-18 April 2002), summer (10-25 July 2002), autumn (26 September-2 October 2002) and winter (22-23 January 2003). The selectivity of the same codend was tested under very similar conditions except for the seasonal variables. The data were obtained using the covered codend technique, and analysed by logistic equation with the maximum likelihood method. Parameters of mean curves for each trip were estimated using Fryer's between haul variation model. The results show that although there is a pattern of decrease in selectivity from summer (L50 = 9.3 cm, SR = 0.9 cm) to autumn (L50 = 9.2 cm, SR = 0.9 cm), winter (L50 = 8.9 cm, SR = 1.1 cm) and spring (L50 = 8.7 cm, SR = 1.1 cm), seasonal differences in selectivity for annular sea bream are not very high.

🔖

Bu Makaleye Atıf Yap

ÖZBİLGİN, H., TOSUNOĞLU, Z., TOKAÇ, A., METİN, G. (2005). Seasonal Variation in Trawl Codend Selectivity for Annular Sea Bream (Diplodus annularis L., 1758). Turkish Journal of Veterinary and Animal Sciences, Cilt: 29 - Sayı: 4, 959–965. https://ajindex.com/articles/133028

📄 Tam Metin PDF Okuyucu

📄

PDF görüntüleyici hazırlanıyor...

Kaynakça (11)

  1. Tosunoğlu, Z., Özbilgin, Y.D., Özbilgin, H.: Body shape and trawl codend selectivity for nine commercial fish species. J. Mar. Biol. Assoc. UK., 2003; 83: 1309-1313. 2. Metin, C., Tosunoğlu, Z., Tokaç, A., Lök, A., Aydın, C., Kaykaç, H.: Seasonal variations of demersal fish composition in Gülbahçe Bay (Izmir Bay). Turk. J. Zool., 2000; 24: 437-446. 3. Devlet İstatistik Enstitüsü, Su Ürünleri İstatistikleri 2001. T.C. Baflbakanlık Devlet İstatistik Enstitüsü, Ankara, 62 s., 2003. 4. Tarım ve Köyiflleri Bakanlığı, Denizlerde ve içsularda ticari amaçlı su ürünleri avcılığını düzenleyen 2002-2004 av dönemine ait 35/1 numaralı sirküler. T.C. Tarım ve Köyiflleri Bakanlığı, Koruma ve Tosunoğlu, Z., Özbilgin, H., Tokaç, A.: Effects of the protective bags on the codend selectivity in Turkish bottom trawl fishery. Arch. Fish. Mar. Res., 2003; 50: 239-252.
  2. Wileman, D.A., Ferro, R.S.T., Fonteyne, R., Millar, R.B. (eds.): Manual of Methods of Measuring the Selectivity of Towed Fishing Gears. ICES Cooperative Research Report, No. 215, Copenhagen, 126 p., 1996.
  3. Tosunoğlu, Z., Tokaç, A., Lök, A., Metin, C.: Trol seçicilik arafltırmalarında kullanılan örtü torba yönteminin farklı iki tekniğinin torba seçiciliğine etkilerinin karflılafltırılması. Turk. J. Vet. Anim. Sci., 1997; 21: 449-456.
  4. Tokai, T.: Maximum likelihood parameter estimates of a mesh selectivity logistic model through SOLVER on MS-Excel. Bull. Jpn. Fish. Oceanog., 1997; 61: 288-298.
  5. Fryer, R.J.: A model of between-haul variation in selectivity. ICES J. Mar. Sci., 1991; 48: 281-290.
  6. Kınacıgil, H.T., Akyol, O.: Effects on trawl selectivity of growth and reproduction in Diplodus annularis L. of Izmir Bay (Aegean Sea). Arch. Fish. Mar. Res., 2001; 49: 19-26.
  7. Özbilgin, H.: The seasonal variation of trawl codend selectivity and the role of learning in mesh penetration behaviour of fish. PhD Thesis in Department of Zoology, University of Aberdeen, Scotland, UK, 206 p., 1998.
  8. He, P.: Swimming speeds of marine fish in relation to fishing gears. ICES Mar. Sci. Symp., 1993; 196: 183-189.
  9. Özbilgin, H., Wardle, C.S.: Effect of seasonal temperature changes on the escape behaviour of haddock, Melanogrammus aeglefinus, from the codend. Fish. Res., 2002; 58: 323-331.
  10. Özbilgin, H.: Effect of temperature change on the maximum swimming speed of whiting, Merlangius merlangus (Linnaeus, 1758), Turk. J. Zool., 2002; 26: 255-262.
  11. Gurbet, R.: Farklı dip trol ağlarının seçiciliği üzerine arafltırma. E.Ü. Arafltırma Fon Saymanlığı, 19