Yong, Annita Seok Kian (2003) Measures and determinants of egg quality in tiger prawn, Penaeus monodon. Masters thesis, Universiti Malaysia Sabah.
![[img]](https://eprints.ums.edu.my/style/images/fileicons/text.png) |
Text
24 PAGES.pdf Download (2MB) |
|
Text
FULLTEXT.pdf Restricted to Registered users only Download (11MB) |
Abstract
ABSTRACT This thesis deals with the egg quality of tiger prawn, Penaeus monodon. The focus is on measures of egg quality and the factors that determine the quality. Egg quality was measured by examining the rates of fertilization, hatching, larval survival and the proportion of larvae successfully metamorphosing to the zoea stage. The data suggested that quality of egg was influenced by a number of intrinsic factors that included the dynamics of turnover of many biochemical constituents and the physiological mechanisms required to support those metabolic activities. The physiological status of the broodstock, particularly the nutritional condition was critically important in the development of the ovary as well as that of the oocytes inside it. A broodstock of tiger prawn was subjected to different dietary treatments and effects on robustness of the test specimens and the chemical quality of the oocytes were investigated. The condition of the broodstock was judged by several parameters such as specific growth rate, body specific growth, food conversion efficiency and food conversion ratio. The composition of the oocytes was determined by the nutrient reserves stored during the process of maturation and the chemicals that were transferred to the ovary to support intracellular synthesis. Experimental verification of egg quality was carried out. Bioencapsulation of live prey in the form of bloodworm was more effective in improving the broodstock condition and enhancing the ovarian development that manifested in egg quality improvement. This dietary treatment significantly:- increased the efficiency with which the broodstock assimilated the ration (higher food conversion efficiency and lower food conversion ratio), gained biomass (higher absolute growth), and achieved more efficient growth (higher body specific growth and specific growth rate), and stimulated the maturation of gonads (earlier onset of maturity and higher proportion of specimens attaining maturity). - improved the egg quality by way of increasing the capacity of the broodstock to ensure transfer of adequate quantities of nutrients to the intra-ovarian oocytes which were responsible for improving quality. The broodstock treatment accelerated RNA and protein biosynthesis, deposition of cholesterol and presumably also of highly unsaturated fatty acids for which there was no de novo synthesis in tiger prawn. The DNA remained unaffected by the accelerated metabolic activity in the egg cytoplasm, which ensured the integrity of the hereditary material necessary to control the processes of embryogenesis that unfolded following fertilization. Quantitative data the above aspects and interpretation of the results are contained in this thesis. The information is of considerable interest to tiger prawn aquaculture, especially for the scientific management of the broodstock in the hatchery and for the production of healthy seeds.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Egg quality, Penaeus monodon, Tiger prawn, Broodstock nutrition, Oocyte development, Larval survival, Zoea stage |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling > SH1-691 Aquaculture. Fisheries. Angling > SH201-399 Fisheries > SH365-380.92 Shellfish fisheries. Shellfish culture |
| Department: | INSTITUTE > Borneo Marine Research Institute |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 21 May 2025 11:07 |
| Last Modified: | 21 May 2025 11:07 |
| URI: | https://eprints.ums.edu.my/id/eprint/43824 |
Actions (login required)
 |
View Item |