Fotoperiyodun kalamar (Loligo vulgaris Lamarck, 1798) yumurtalarının gelişimine ve inkübasyon başarısına etkisi

Bu çalışmada, fotoperiyodun, Avrupa kalamarı (Loligo vulgaris Lamarck, 1798) yumurtalarının gelişimine ve inkübasyonuna olan etkileri incelenmiştir. Yumurta kapsülleri, 14 saat aydınlık/10 saat karanlık (P1; doğal gün aydınlanma süresi), 10 saat aydınlık/14 saat karanlık (P2; doğal gün aydınlanma süresinin tersi), 12 saat aydınlık/12 saat karanlık (P3), 24 saat aydınlık (P4) ve 24 saat karanlık (P5) fotoperiyotlarda inkübe edilmiştir. Denemeler, doğal deniz suyunda (%37±0.5 ve 20.3±0.8°C) yapılmıştır. Embriyonik gelişim ve yumurtadan çıkış süreleri P1'de 17-20 gün, P2'de 17-23 gün, P3'te 17-24 gün, P4'te 16-22 gün ve P5'te 16-23 gün arasında gözlenmiştir. En yüksek yumurta açılım oranı, 12 saat aydınlık/12 saat karanlık rejiminde (%100) ve en yüksek yumurta açılım başarısı 24 saat aydınlık rejimde (%51.8) hesaplanmıştır. Yumurtadan yeni çıkmış yavruların ortalama sırt manto boylan tüm gruplar için 2.44±0.16 mm olarak ölçülmüştür.

Anahtar Kelimeler:

fotoperiyot, embriyonik gelişim, fotoperiyodizm, kalamar, balık yumurtası, yumurtadan çıkmak, kuluçka

Effects of photoperiodicity on development and incubation of squid (Loligo vulgaris Lamarck, 1978) eggs

In this study, effects of photoperiod on development and incubation of European squid (Loligo vulgaris Lamarck, 1798) eggs were 'investigated. The egg capsules were incubated at 14 h light/10 h dark (P1; daily light period), 10 h light/14 h dark (P2; opposite of daily light period), 12 light/12 h dark (P3), 24 h light (P4) and 24 h dark (P5) of photoperiodicities. The experiments were performed at natural sea water (37±0.5%o, 20.3±0.8°C). The embryonic development and hatching were observed between 17-20 days at P1, 17-23 days at P2,17-24 days at P3,16-22 days at P4, and 16-23 days at P5. The highest hatching rate and hatching success were estimated as 100% at 12 h light/12 h dark and 51.8% at 24 h light of photoperiodicities, respectively. Average dorsal mantle length of the newly hatchlings for all experimental groups was measured as 2.44+0.16 mm.

Keywords:

photoperiod, embryonic development, photoperiodism, squids, fish eggs, hatching, incubation,

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