Some Population Parameters of Wedge Clam (Donax trunculus Linnaeus, 1758) in Sinop Coasts

Abstract

This study was carried out to determine some population parameters of wedge clam (D. trunculus) in Sinop (South Black Sea coasts). In the monthly samplings, a total of 1417 individuals were caught and the smallest, largest and average shell lengths were determined as 6.94 mm, 33.78 mm and 19.637 ± 0.1202 mm, respectively. Only 108 (7.6%) of the sampled individuals were 2.5 cm or larger, which is the current minimum catch length. While the average shell width as 11.945 ± 0.0650 mm and the ratio of crustal width to shell length was determined as 0.613 ± 0.0008, mean shell height and the ratio of shell height to shell length was estimated as 6.192 ± 0.0409 mm and 0.314 ± 0.00046. The length–weight relationship and Fulton's condition factor for all sampled individuals was estimated as W=0.00022 L2.82962 (r=0.992) and as 0.00013 ± 0.0000004, and the mean meat yield ratio of samples was determined as 0.352 ± 0.0016. It was determined that reproduction occurring in April and May and the sex ratio was 0.953:1.

Keywords

• Donax trunculus
• wedge clam
• morphometric characters
• population parameters

Sinop Kıyılarında Kum Şırlanının (Donax trunculus Linnaeus, 1758) Bazı Populasyonun Parametreleri

Abstract

Bu çalışma Sinop kıyılarında kum şırlanının (D. trunculus) bazı populasyon parametrelerini belirlemek amacıyla yürütülmüştür. Aylık olarak yapılan örneklemelerde toplam 1417 adet birey elde edilmiş, en küçük, en büyük ve ortalama kabuk boyu sırasıyla 6.94 mm, 33.78 mm ve 19.637 ± 0.1202 mm olarak belirlenmiştir. Örneklenen bireylerin sadece 108 adedi (%7.6) geçerli asgari avlama boyu olan 2.5 cm ve daha büyük bireylerden oluşmaktadır. Ortalama kabuk genişliği 11.945 ± 0.0650 mm, kabuk genişliğinin kabuk boyuna oranı 0.613 ± 0.0008 olarak belirlenirken, ortalama kabuk yüksekliği 6.192 ± 0.0409 mm ve kabuk yüksekliğinin kabuk uzunluğuna boyuna oranı 0.314 ± 0.00046 olarak tahmin edilmiştir. Örneklenen tüm bireyler için boy–ağırlık ilişkisi denklemi W=0.00022 L^2.82962 (r=0.992), Fulton’un kondisyon faktörü 0.00013 ± 0.0000004 ve ortalama et oranı 0.352 ± 0.0016 olarak hesaplanmıştır. Üreme Nisan ve Mayıs aylarında gerçekleşmekte olup cinsiyet oranı 0.953:1 olarak tespit edilmiştir.

Keywords

• Donax trunculus
• kum şırlanı
• şekilsel özellikler
• populasyon parametreleri

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