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Reproduction Strategy of Arabian Whipray Himantura randalli Last, Manjaji-Matsumoto & Moore, 2012 in Iraqi marine waters, northwestern Arabian Gulf | ||
| Basrah Journal of Agricultural Sciences | ||
| Article 28, Volume 29, Issue 1, 2016, Pages 310-323 PDF (0 K) | ||
| DOI: 10.33762/bagrs.2016.116246 | ||
| Authors | ||
| Jenan H. J. Al-Lammy; Amjad K. Resen; Sajid S. Hassan | ||
| Abstract | ||
| Reproduction strategy of Arabian whipray Himantura randalli Last, Manjaji-Matsumoto & Moore, 2012 was studied in Iraqi marine water from January, 2014 to December, 2015. A total of 321 specimens (176 females and 145 males) were collected by trawling net of Al-Bahith ship (related to Marine Science Centre). Results are pointed that there were five groups of disk width, with smallest fish of 70 mm disk width and 16 g in weight, while largest fish of 750 mm disk width and 3834 g. Smallest fish appeared firstly at July concluding that birthing occurred during this month. Relationship for both sex between disk width and weight was represented by following equation: W=0.0006 x (DW) 2.449 . Results also appeared that the disk width of smallest matured female was 385 mm and weight 1936 g, while the disk width of smallest matured male was 355 mm and weight 11249 g. Sex ratio was differ during different months especially at reproduction period where ratio of females 64.5% and males 35.5%, so overall sex ratio was 1:1.2 towards females. The cycle of gonad maturation was divided into three stages: immature, maturing and mature for males and females. The GSI values were different during study period, and birthing was considered during June to July. The ovary contain many eggs of different sizes, while the uterus contain 2-5 embryos that surrounding by strong covers and there wasn’t any placenta intelligence between embryos and female, so this fish considered as Ovoviviparous. Depending on histological inspections of gonads, spermatocytes were divided into seven maturing stages, while oocytes into four maturing stages. | ||
| Keywords | ||
| ray; Himantura randalli; reproductive strategies; Iraq | ||
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