MORPHOLOGY AND GENERAL REPRODUCTIVE STAGES OF ...

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oocytes stages observed in the study were from oogonia to late vitellogenesis. Six microscopic oocytes developmental stages were assigned for the studied ovaries of P. nasutus, namely resting, maturing, mature, spawning, running and spent stages. Further, microscopic observation on the ‘whole-section’ of the testes revealed that four testicular development stages could be distinguished namely early spermatogenesis, spermatogenesis, maturation and spent stages. In this study, it was found that the female and male P. nasutus were reproductively active at the beginning of rainy season which commenced in the middle quarter of 2005, from March to September coincided with the South-West monsoon. The study also revealed that P. nasutus exhibits a single-modal spawning season in a year, with multiple release of eggs during a single period. Such condition showed that P. nasutus is a multiple-spawner as supported by the group-synchronous oocyte development of the ovary. However, spawning did not commence synchronously within the population with the obvious presence of various female and male reproductive stages within a single sampling month. iv
Abstrak tesis yang dikemukakan kepada Senat Universiti Putra Malaysia sebagai memenuhi keperluan untuk Ijazah Master Sains MORFOLOGI DAN PERINGKAT PERKEMBANGAN PEMBIAKAN Pangasius nasutus DARI SG. PAHANG DI DALAM DAERAH MARAN, PAHANG, MALAYSIA Pengerusi : Annie Christianus, PhD Oleh MOHD ZAFRI BIN HASSAN Jun 2006 Fakulti : Pertanian Kajian ini telah dijalankan untuk menerangkan perbezaan morfologi antara P. nasutus dan P. conchophilus, menghurai dan mengkelaskan histologi oosit dan sel-sel spermatogenik bagi P. nasutus matang dan seterusnya untuk melihat corak bermusim untuk peringkat-peringkat gonad bagi P. nasutus. Dua puluh spesimen P. nasutus dan P. conchophilus dari Maran, Pahang telah dikaji. Untuk melihat perbezaan spesies, dua puluh spesimen P. conchophius berasal dari Thailand tetapi dikultur dalam sangkar di Sungai Pahang, dekat Pekan, Pahang, Malaysia, turut dikaji. Ukuran-ukuran morfometrik diberikan dalam bentuk peratusan panjang piawai (%SL), panjang pra-dorsal (%PDL) dan panjang kepala (%HL). Berdasarkan keputusan pengkelasan, semua specimen P. nasutus adalah berbeza dari P. conchophilus pada kedua-dua populasi, terutamanya dari segi panjang muncung, diameter mata, panjang rahang bawah dan atas. v
Page 1 and 2: UNIVERSITI PUTRA MALAYSIA MORPHOLOG
Page 3 and 4: MORPHOLOGY AND GENERAL REPRODUCTIVE
Page 5: Abstract of thesis presented to the
Page 9 and 10: ACKNOWLEDGEMENTS In the name of All
Page 11 and 12: This thesis submitted to the Senate
Page 13 and 14: TABLE OF CONTENTS DEDICATION ABSTRA
Page 15 and 16: LIST OF TABLES Table Page 1 Subgene
Page 17 and 18: LIST OF FIGURES Figure 1 Taxonomic
Page 19 and 20: 24 Nucleolar stage. Chromatin nucle
Page 21 and 22: LIST OF ABBREVIATIONS Analysis of V
Page 23 and 24: A number of species of the family P
Page 25: Reproductive biology has served num

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