Zakaria Saad MOHAMMED, Hamed Mohamed YASSIEN

Populatin parameters of the pearl oyster Pinctada radiata (Leach) in Qatari waters,Arabian gulf

İnci istiridyesi (Pinctada radiata), Katar sularında en bol bulunan midye türüdür. Bu nedenle, bu türe ait populasyon parametreleri incelenmiş ve Akdeniz ile Kızıldeniz'de daha önceden yapılmış araştırmaların sonuçlarıyla karşılaştırılmıştır. Katar sularındaki inci istiridyelerinin ortalama boyları sırasıyla 56.75, 65.84, 77.54 ve 84.66 mm olan dört yaş grubu (kohort) saptanmıştır. Toplam ölüm katsayısı (Z) 2.47$yıl^{-1}$ eşiken; sonuşmaz (asimptotik) boy (Ls), Brody'nin büyüme katsayısı (K) ve büyüme performansı indeksi (s) değerlerinin sırasıyla 132.18 mm, 0.34 $yıl^{-1}$ ve 1.77 olduğu belirlenmiştir. Dorsoventral uzunluk ve toplam ağırlık arasındaki morfometrik ilişki W = 0.0002606 $(DVM)^{2.90707}$ ile ifade edilebilmiştir.

Arap Körfezi'nin Katar sularında inci istiridyesinin Pinctada radiata (Leach) populasyon parametreleri

The pearl oyster, Pinctada radiata, represents the most abundant marine bivalve species in Qatari waters. The population parameters,of this species were investigated and compared to those obtained previously from both the Mediterranean and Red seas. Four age groups with mean lengths of 56.75, 65.84, 77.54 and 84.66 mm were obtained for P. radiata from Qatari waters. The values of asymptotic length, Brody's growth coefficient and growth performance index were 132.18 mm, 0.34 $y^{-1}$ and 1.77 respectively, while the total mortality coefficient equals 2.47 $y^{-1}$. The morphometric relationship between the total weight and dorso-ventral measurement was determined to be W = 0.0002606 $(DVM)^{2.90707}$.

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