Population dynamics of the Mediterranean green crab Carcinus aestuarii Nardo, 1847 (Crustacea: Portunidae) in the Gediz Delta (Izmir Bay, Eastern Aegean Sea)

Creative Commons License

Tıraşın E. M., Salman M. A., Akalın M., Özaydın O.

ACTA ADRIATICA, cilt.61, sa.1, ss.39-56, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 61 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.32582/aa.61.1.3
  • Dergi Adı: ACTA ADRIATICA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Environment Index, Geobase, Veterinary Science Database
  • Sayfa Sayıları: ss.39-56
  • Anahtar Kelimeler: Mediterranean green crab, Carcinus aestuarii, growth, mortality, reproduction, size at first maturity, REPRODUCTIVE-BIOLOGY, HOMA LAGOON, DECAPODA, BRACHYURA, PARAMETERS, FEATURES
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

A total of 6265 Mediterranean green crabs Carcinus aestuarii were sampled from the Gediz Delta in the eastern Aegean Sea (Turkey) during 24 sampling surveys with a 15-day interval from November 2014 to October 2015. The overall ratio of males to females was 1.8:1. Males were predominant in all sampling surveys, except in September 2015. The ranges of total weight (W) and carapace width (CW) for all crabs were 0.19-45.74 g and 8-53 mm. Male crabs were, on average, larger and heavier than females. The W-CW relationships were W=0.0004xCW(2.88) for females, and W 0.0003xCW(2.96) for males. The estimated von Bertalanffy growth parameters for females were: CW infinity =49 mm, K=0.82 year(-1) and t(0) =0.9 year, and for males CW infinity= 54 mm, K=0.92 year(-1) and t(0) =0.96 year. The total mortality rates were 2.25 and 2.27 year(-1) for females and males, respectively. The breeding season spans from mid fall to early spring peaking in winter. The recruitment of juveniles to the lagoon happens predominantly in summer. The median size at first maturity was 30.6 mm for, emales and 41.5 mm for males. The average potential, ecundity estimate was 63565 +/- 36519 oocytes per female crab while the average realized fecundity was 42810 +/- 03310 eggs.