Ovarian development in relation to body weight of juvenile black tiger
prawn Penaeus monodon
ความสัมพันธ์ของพัฒนาการของรังไข่กับน้ำหนักตัวกุ้งกุลาดำ Penaeus monodon วัยอ่อน
Jintamas Suwanjarat, Assoc. Prof., D. of Biology, F. of Sci., PSU.
Vanida Lim, D. of Biology, F. of Sci., PSU.
Usawadee Decha, D. of Biology, F. of Sci., PSU.
Corresponding e-mail : sjintama@ratree.psu.ac.th
Published : Songklanakarin J Sci Technol 2000, 22(Suppl.) : 725-733
Key words : Penaeus monodon , black tiger prawn, ovarian development
The examination of ovarian development and ovarian stages in relation to body weight was carried out in the ovaries of the black tiger prawn Penaeus monodon with the body weight (BW) between 15 and 35 g. Histological sections were stained using haematoxylin and eosin, and Mallory trichrome stain. Ovaries of a 10 g to 15 g BW Penaeus monodon were in stage 2, or chromatin nucleolus stage. The ovary of 20 to 35 g BW was in stage 3, or perinucleolus stage, with the mean oocyte diameter measured 43.92ฑ7.75 mm. There was no significant difference in the mean oocyte diameter between the ovaries in the C4 region of 15, 20 and 25 g BW Penaeus monodon, while the mean oocyte diameter of a 10 g BW Penaeus monodon was significantly smaller than those of the 15, 20, 25 and 30 g BW Penaeus monodon. In addition, the mean oocyte diameter of 15 to 25 g BW Penaeus monodon was significantly smaller than that of a 30 g BW Penaeus monodon. It was concluded that the ovarian developmental stage is related to the body weight. The female Penaeus monodon of 10 to 35 g BW consisted of stage 2 and 3 ovaries, and may not have reached the requirement for stage 4 in ovarian development with the body weight under 35 g.
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