Effects of hexagonal- And diamond-shaped mesh traps on size selectivity of freshwater crayfish astacus leptodactylus eschscholtz, 1823 (Decapoda: Astacidae) in the Eğirdir Lake, Turkey

BOLAT Y., Uçgun E.

Acta Zoologica Bulgarica, cilt.72, sa.1, ss.131-136, 2020 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Derleme
  • Cilt numarası: 72 Sayı: 1
  • Basım Tarihi: 2020
  • Dergi Adı: Acta Zoologica Bulgarica
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Veterinary Science Database
  • Sayfa Sayıları: ss.131-136
  • Anahtar Kelimeler: Astacus leptodactylus, Diamond-shaped mesh, Hexagonal-shaped mesh, Mesh shape, Mesh size, SELECT method, Size selectivity
  • Isparta Uygulamalı Bilimler Üniversitesi Adresli: Evet

Özet

The size selectivity of crayfish traps (fyke-nets) with 34, 38 or 42 mm mesh size and with diamond-shaped (D) or hexagonal-shaped (Hex) mesh was compared for narrow-clawed crayfish Astacus leptodactylus Eschscholtz, 1823 in the Eğirdir Lake, Turkey. The SELECT model was used to fit the logistic selection curves and to calculate selectivity parameters. The selectivity curves and parameters were calculated by comparing the size frequencies of the crayfish retained in the traps, including the 34 mm diamond (D) trap control. The 50%-selectivity length (l50) and selection range (SR) of fyke-net traps with diamond mesh were 8.70 cm and 3.16 cm for 38 mm (38 D) and 8.69 cm and 1.99 cm for 42 mm (42 D) bar length. The l50 and SR values of hexagonal mesh traps were 8.06 cm and 3.42 cm for 34 mm (34 Hex), 10.23 cm and 2.80 cm for 38 mm (38 Hex) and 11.00 cm and 2.62 cm for 42 mm (42 Hex) bar length, respectively.