Short-term chronic effects of cadmium and zinc of survival, growth and hispathology of postlarval penaeus monodon (fabrius) / by Judith R. Silapan.
Material type: TextLanguage: English Publication details: Diliman, Quezon City : 1999. University of the Philippines Diliman,Description: ix, 57 pages : illustrations ; 28 cmContent type:- text
- unmediated
- volume
- 591.77 Si3 1999
Item type | Current library | Collection | Call number | Materials specified | URL | Status | Notes | Date due | Barcode |
---|---|---|---|---|---|---|---|---|---|
Theses / Manuscripts | Ladislao N. Diwa Memorial Library Theses Section | Non-fiction | 591.77 Si3 1999 (Browse shelf(Opens below)) | Link to resource | Room use only | T-5958 | 00009631 |
Thesis (Master of Science in Marine Science) University of the Philippines
Includes bibliographical references.
For comparative purposes, the toxicity of cadmium and zinc to postlarval Penaeus monodon (Fabricius) was evaluated using short-term chronic tests. Toxicity to the postlarvae was measured in terms of survival, growth and histopathology over 8 and 15 days. The 96-hr LCso (lethal concentration) values were 1.83 mg Cd"/L and 3.16 mg Zn*/L. The IC3s (inhibition concentration) values were 0.08 to 0.63 mg Cd”“/L and 0.42 to 0.76 mg Zn”*/L. For survival, the SCv (short-term chronic value) 0.6 mg Cd?*/L was slightly but consistently lower than the 1.8 mg Zn’*/L. For growth, the sensitivity of the postlarvae to the two contaminants overlapped in some cases (0.21 to 0.6 mg Cd?*/L and 0.21 to 1.32 mg Zn°*/L) with Cd values generally lower than Zn by one to within an order of magnitude. Histopathological responses were observed in the hepatopancreas of the postlarvae. Animals from the control and lower concentrations of Zn (0.001, 0.01 and 0.1 mg/L) showed normal histology. At concentration of Zn that affected growth (1.0 mg/L), the most prominent structural change was the presence of a lot of large secretory cells compared to very few smaller, absorptive or storage cells. The latter were in many cases, devoid of vacuoles. On the other hand, animals exposed to Cd had no defined cell- type abnormalities even at concentration which affected growth (0.1 mg/L) The apparent reduction in size of the various cells found in the hepatopancreas and the general looseness in the organ’s appearance did not correlate with increasing Cd concentration.
Submitted to the University Library 08/04/2020 T-5958