The embryonic development of orange mud crab, Scylla olivacea (Herbst, ۱۷۹۶) held in the captivity

سال انتشار: 1394
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 104

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شناسه ملی سند علمی:

JR_JIFRO-14-4_007

تاریخ نمایه سازی: 27 بهمن 1400

چکیده مقاله:

This study attempts to observe and record early embryonic developments of the orange mud crab, Scylla olivacea. The period taken by the eggs to hatch was ۸ days and the colour of the eggs gradually changed from yellow to brown, gray and dark gray. During the embryonic development, the developing embryos reached the blastula stage within ۲۴ hours with a mean egg diameter of ۳۲۹.۹۱ µm ± ۶.۶۲. The embryo developed into the gastrula stage on the ۲nd day with a mean egg diameter of ۳۳۷.۱۰ µm ± ۸.۳۷. Eyes were consequently observed on the ۳rd day and there was a further increase in the yolk-free portion with a mean egg diameter of ۳۳۸.۱۶ µm ± ۶.۵۷. On the ۴th day, the eye-spot became crescent and there was a clearer tissue formation with a mean egg diameter of ۳۵۸.۴۵ µm ± ۱۴.۸۰. Meanwhile, on the ۷th day prior hatching, there were many chromatophores present, mostly dark in colour and the yolk granules had further reduced in size. The heart beats faster than previous days before and the embryo occupied most of the available egg volume with a mean egg diameter of ۳۷۷.۲۶ µm ± ۱۱.۵۰.