Reproductive conditioning of Tridacna crocea (Tridacnidae) using algae and dissolved inorganic nitrogen as nutritional supplements / by Hilly Ann Marie Roa.
Material type:
TextLanguage: English Publication details: Diliman, Quezon City : 1997. University of the Philippines Diliman,Description: xiv, 73 pages : illustrations ; 28 cmContent type: - text
- unmediated
- volume
- 578.77 R53 1997
| Item type | Current library | Collection | Call number | Materials specified | URL | Status | Notes | Date due | Barcode |
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Theses / Manuscripts
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Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 578.77 R53 1997 (Browse shelf(Opens below)) | Link to resource | Room use only | T-5954 | 00009634 |
Thesis (Master of Science in Marine Science) University of the Philippines
Includes bibliographical references.
Hermaphroditic T. crocea were hatchery-conditioned with nutritional supplements of dissolved inorganic nitrogen (DIN) and live mixed algal diet of /sochrysis galbana and Tetraselmis tetrathele, taking into account the autotrophic and heterotrophic sources of tridacnid nutrition. Four conditioning treatments were applied as follows: algal conditioning, nitrogen conditioning, combination of both algae and nitrogen, and hatchery control. The gonads were examined histologically to determine reproductive stages of development, and gonad index, protein, carbohydrate, and lipid contents were measured.
The DIN and live algae supplemented to the clams significantly influenced the protein and carbohydrate concentrations found in the gonads. Lipids were significantly influenced by algae alone. Conditioned broodstock had higher concentrations of the above components than the controls. Significant difference was found among the different treatments in the reproductive stages of development of the ovary and testis over the experimental period. No significant difference was found on the gonad state and synchronicity of reproductive stages of both ovary and testis. There was no significant and strong association between the protein, lipid and carbohydrate components in the gonads to the reproductive stages of development.
The data and sampling intervals in this study are not sufficient to infer the gametogenic rate and cycle of the different treatments. But, the results showed the significant influence of the nutritional supplement in enhancing a shift in gametogenic development in its ordered and chronological process over the 4 months of nutritional exposure.
Submitted to the University Library 08/04/2020 T-5954