Effects of Feeding Frequency on Growth Performance and Molting Cycle of Two Different Size Classes of Red Swamp Crayfish (Procambarus clarkii)

Abstract

Red swamp crayfish (Procambarus clarkii) is an important crayfish species for both aquaculture and ornamental purposes. In this study, growth performance, survival rate, and molting cycle were evaluated with three feeding frequencies, including every other day (2F1), two (F2) and four times (F4) daily in two different age classes (Size I, 15 days old and Size II, 45 days old). The study was carried out in 50 L glass aquariums with three replicates for 12 weeks. The highest final mean weight (FMW) of Size I group was found in F4 (P<0.05). F2 and F4 groups attained higher final mean weight, final mean total length (FMTL) and final mean carapace length (FMCL) for Size II (P<0.05). Although there were no statistical differences in survival rates (SR) of Size I (P>0.05), the highest SR was recorded in F2 for both size groups. Molting cycle of F2 was the highest for Size I and there was a moderate increase from F2 to F4 in Size II group. In conclusion, F4 for Size I and F2 for Size II groups are recommended. Further feeding studies such as starvation and refeeding cycles, feeding rate, feeding time, etc. are necessary for this important crayfish species.

Keywords

• Ornamental crayfish,freshwater decapods,meal frequency,feeding regime

İki Farklı Boy Sınıfındaki Kırmızı Bataklık Kerevitlerinde (Procambarus clarkii) Yemleme Sıklığının Büyüme Performansı ve Kabuk Değiştirme Üzerine Etkileri

Öz

 Kırmızı bataklık kereviti (Procambarus clarkii) hem su ürünleri yetiştiriciliği hem de süs amacı için önemli bir kerevit türüdür. Bu çalışmada, iki farklı boy grubundaki (Boy I, 15 günlük ve Boy II, 45 günlük) kırmızı bataklık kerevitlerinin iki günde bir (2F1), günde iki (F2) ve günde dört (F4) kez olmak üzere 3 farklı yemleme sıklığında büyüme performansları, yaşama oranları ve kabuk değişim periyotları araştırılmıştır. Çalışma 12 hafta boyunca üç tekrarlı olarak 50 L cam akvaryumlarda gerçekleştirilmiştir. Boy I grubu için en yüksek son ortalama ağırlık F4 grubunda bulunmuştur (P<0,05). Boy II grubunda F2 ve F4 sıklıklarının son ortalama ağırlık, son ortalama total boy ve son ortalama karapas boyları daha yüksektir (P<0,05). Boy I grubunun yaşama oranlarında istatistiksel olarak anlamlı bir fark bulunmamasına rağmen (P>0,05), her iki boy grubu için F2 sıklığında en yüksek yaşama oranı kaydedilmiştir. Boy I grubunda F2 sıklığının kabuk değişim sayısı en yüksektir ve Boy II grubunda ise F2’den F4’e doğru bir yükseliş vardır. Sonuç olarak, Boy I grubu için günde dört kez, Boy II için ise günde iki kez besleme önerilmektedir. Bu önemli kerevit türü için açlık döngüsü, yemleme oranı, yemleme zamanı, vb. gibi daha fazla beslenme çalışması yapılması gereklidir.

Anahtar Kelimeler

• Süs kereviti,tatlısu dekapodları,besin sıklığı,yemleme rejimi

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