SavedAdd your journal

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

Selectivity of Standard, Narrow and Square Mesh Panel Trawl Codends for Hake (Merluccius merluccius) and Poor Cod (Trisopterus minutus capelanus)

Hüseyin ÖZBİLGİN
Zafer TOSUNOĞLU
Celalettin AYDIN
Hakan KAYKAÇ
Adnan TOKAÇ
Pages
967–973
Publication Date
2005-04-01
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results show that the commercially used standard codend (40 mm mesh size PE codends, 200 meshes on its circumference) retains all the hake that enter and releases only a few specimens of poor cod.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:The selectivity of 3 trawl codends, (1) a commercially used standard codend, (2) a narrow codend (100 meshes on its circumference instead of 200) and (3) a square mesh top panel codend, was tested for hake (Merluccius merluccius) and poor cod (Trisopterus minutus capelanus) between 8 and 24 October 2003, in the Aegean Sea.
📊
Key Findings & Data:The results show that the commercially used standard codend (40 mm mesh size PE codends, 200 meshes on its circumference) retains all the hake that enter and releases only a few specimens of poor cod.
💡
Conclusion & Impact:The selectivity of the square mesh top panel codend was higher than that of the narrow codend for hake (L50 = 15.25 cm), while it was similar for poor cod (L50 = 14.25 cm).
🔬Design:Research Article
📍Scope:2003 Verileri
⚙️Variables:Trawl selectivity · narrow codend · square mesh panel

Abstract

The selectivity of 3 trawl codends, (1) a commercially used standard codend, (2) a narrow codend (100 meshes on its circumference instead of 200) and (3) a square mesh top panel codend, was tested for hake (Merluccius merluccius) and poor cod (Trisopterus minutus capelanus) between 8 and 24 October 2003, in the Aegean Sea. Data were collected using the covered codend technique, and analysed by means of a logistic equation with the maximum likelihood method. The results show that the commercially used standard codend (40 mm mesh size PE codends, 200 meshes on its circumference) retains all the hake that enter and releases only a few specimens of poor cod. The narrow codend has better selectivity than the standard codend (L50 = 14.28 cm for hake and 14.11 cm for poor cod). The selectivity of the square mesh top panel codend was higher than that of the narrow codend for hake (L50 = 15.25 cm), while it was similar for poor cod (L50 = 14.25 cm).

Özet

The selectivity of 3 trawl codends, (1) a commercially used standard codend, (2) a narrow codend (100 meshes on its circumference instead of 200) and (3) a square mesh top panel codend, was tested for hake (Merluccius merluccius) and poor cod (Trisopterus minutus capelanus) between 8 and 24 October 2003, in the Aegean Sea. Data were collected using the covered codend technique, and analysed by means of a logistic equation with the maximum likelihood method. The results show that the commercially used standard codend (40 mm mesh size PE codends, 200 meshes on its circumference) retains all the hake that enter and releases only a few specimens of poor cod. The narrow codend has better selectivity than the standard codend (L50 = 14.28 cm for hake and 14.11 cm for poor cod). The selectivity of the square mesh top panel codend was higher than that of the narrow codend for hake (L50 = 15.25 cm), while it was similar for poor cod (L50 = 14.25 cm).

🔖

Cite This Article

ÖZBİLGİN, H., TOSUNOĞLU, Z., AYDIN, C., KAYKAÇ, H., TOKAÇ, A. (2005). Selectivity of Standard, Narrow and Square Mesh Panel Trawl Codends for Hake (Merluccius merluccius) and Poor Cod (Trisopterus minutus capelanus). Turkish Journal of Veterinary and Animal Sciences, Cilt: 29 - Sayı: 4, 967–973. https://ajindex.com/articles/133029

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (9)

  1. Tokaç, A., Lök, A., Tosunoğlu, Z., Metin, C., Ferro, R.S.T.: Cod- end selectivities of a modified bottom trawl for three fish species in the Aegean Sea. Fish. Res., 1998; 39: 17-31.
  2. Özbilgin, H., Tosunoğlu, Z.: Comparison of the selectivities of double and single codends. Fish. Res., 2003; 63: 143-147. 3. 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. 4. 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.
  3. Tokaç, A., Özbilgin, H., Tosunoğlu, Z.: Effect of PA and PE material on codend selectivity in Turkish bottom trawl. Fish. Res., 2003; 67: 317-327. 6. Tokaç, A.: Studies on the improvement of bottom trawl selectivity in Aegean Sea. Contributions on the Theory of Fishing Gears and Related Marine Systems, Rostock. 2002; 259-274. 7. Stewart, P.A.M.: A review of studies of fishing gear selectivity in the Mediterranean. FAO, COPEMED. 2001. Devlet İstatistik Enstitüsü: Su Ürünleri İstatistikleri 2001. T.C. Baflbakanlık Devlet İstatistik Enstitüsü, Ankara. 2003. 9. 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 Kontrol Genel Müdürlüğü, Ankara. 2002.
  4. Politou, C.Y., Papaconstantinou, C.: Population biology of Trisopterus minutus capelanus (Gadidae) from the eastern coast of Greece. Cybium, 1991; 15: 69-81.
  5. Robertson, J.H.B., Stewart, P.A.M.: A comparison of size selection of haddock and whiting by square and diamond mesh codends. J. Cons. Int. Explor. Mer., 1988; 44: 148-161.
  6. Reeves, S.A., Armstrong, D.W., Freyer, R.J., Coull, K.A.: The effects of mesh size, cod-end extension length and cod-end diameter on the selectivity of Scottish trawls and seines. ICES J. Mar. Sci., 1992; 49: 279-288.
  7. Tosunoğlu, Z., Özbilgin, Y.D., Özbilgin, H.: Determination of the appropriate hanging ratios to ease the escape of juvenile red mullet (Mullus barbatus L., 1758) and annular sea bream (Diplodus annularis L., 1758) from trawl codend. Turk. J. Vet. Anim. Sci., 2003; 27: 1193-1199.
  8. Petrakis, G., Stergiou, K.I.: Size selectivity of diamond and square mesh codends for four commercial Mediterranean fish species. ICES J. Mar. Sci., 1997; 54: 13-23.
  9. Campos, A., Fonseca, P.: Selectivity of diamond and squa