Tatlısu Kereviti (Astacus leptodactylus Eschscholtz, 1823)’ un Embriyonik ve Postembriyonik Gelişimi

Abstract

Tatlısu kerevitlerinden Astacus leptodactylus’un yumurta gelişimi hakkında çok az bilgi vardır. Özellikle A.leptodactylus’un post embryonik gelişimin bazı yapıları tanımlanmıştır. Fakat diğer türlerden farklı olarak uzun bir inkübasyon süresine (5-6 ay) sahip olan A. leptodactylus’ un embryonik gelişimleri tanımlanmamıştır. Bu çalışmada A. leptodactylus’ un yumurta gelişimi, yumurtlamadan III. dönem larva aşamasına kadar, doğal ortamlarındaki sıcaklık şartlarına benzer olarak oluşturulan laboratuar şartları altında 9oC ile 15oC’ ler arasında fotoğraflandırılarak çalışılmıştır. A. leptodactylus’ un yumurtaları belirtilen şartlar altında 1608 gün/derece de açılmıştır. Yumurta açılımından 7-8 gün sonra, I. dönem larvalar ilk kabuklarını değiştirerek II. döneme ulaşmışlardır. İlk kabuk değişiminden 9-10 gün sonra II. dönem larvalar ikinci kabuklarını değiştirerek III. döneme ulaşmışlardır.

Keywords

• Embriyo, gelişim, Astacus leptodactylus, Astacidae, Kabuklular

Embryonic and Postembryonic Development of Freshwater Crayfish (Astacus leptodactylus Eschscholtz, 1823)

Abstract

There is little knowledge about the egg development of freshwater crayfish (Astacus leptodactylus). Especially, some aspects of the postembryonic development of A. leptodactylus have been described in previous studies. However, all embryonic development of A. leptodactylus species, which has a long incubation period (5-6 month) has not been described. In this study, embryonic and post embryonic development of A. leptodactylus species was studied by a stereomicroscope under laboratory conditions which have similar temperature conditions with ones in their natural habitat in between 9oC -15οC. The eggs of this species hatched in 1608 degrees x days under these conditions. After 7-8 days of hatching, juvenile stage I reached to juvenile stage II with changing first moult. After 9-10 days of first moult, juvenile stage II reached to juvenile stage III with changing second moult.

Keywords

• Embryo, development, Astacus leptodactylus, Astacidae, crustacea

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