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Effect of Mexel®432 on DNA Damage in <em>Haliotis Discus Hannai</em> and <em>Mesocentrotus Nudus</em>
No full textMexel®432 is a surfactant-like substance that is a biosuppressant against marine fouling organisms. Therefore, to study the toxic effect of Mexel®432 on marine organisms, the wrinkled abalone and echinococcus was exposed to concentrations of 0.175 mg·L-1, 0.350 mg·L-1, 0.700 mg·L-1, 0.275 mg·L-1, 0.550 mg∙L-1, 1.100 mg·L-1 Mexel®432 solution, and single-cell gel electrophoresis (comet experiment) was used to detect different exposure times (0, 10, 20 d) DNA damage effect of digestive gland cells and echinococcus pallidae intestinal cells in wrinkled disc abalone, and tail DNA content, tail length, tail distance, and Olive tail distance were used as evaluation indexes. The results showed that different concentrations of Mexel®432 could cause DNA disintegration and tailing in digestive gland cells and intestinal cells in a short period of time (10 d), and with the increase of Mexel®432 concentration and the extension of exposure time, DNA deformation was obvious, the fragmentation increased, and the degree of damage was aggravated. When the concentration of Mexel®432 reaches 0.350 mg·L-1, it produces certain genotoxicity to the digestive gland cells of wrinkled abalone, and when the concentration of Mexel®432 reaches 1.1000 mg·L-1, it also has certain genotoxicity to the intestinal cells of Mesocentrotus nudus. The experimental results showed that Mexel®432 had a significant dose effect relationship on DNA damage in the cells of two biological tissues
Legislative files: Other legislation: "Laws that Treat Hawaii Differently": Federal responses to survey: General: Department of Agriculture
No full textPolitical Offices: State Legislature: Subject Files: The Honolulu Waterfront Area: A Planning and Engineering Study for the Development of the Honolulu Waterfront
Get PDFLegislative files: Other legislation: "Laws that Treat Hawaii Differently": Financial: General Services Administration
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Legislative files: Other legislation: "Laws that Treat Hawaii Differently": Appendix: Joint travel regulations (1 of 3)
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Legislative files: Other legislation: "Laws that Treat Hawaii Differently": Federal responses to survey: General: Civil Service Commission
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Improved breeding and seed production of climbing perch (<em>Anabas testudineus</em>) in controlled tanks and cage systems
Get PDFThe climbing perch (Anabas testudineus) is a valuable fish species with significant potential for aquaculture. However, a low survival rate was observed at its early development stages, requiring an optimized protocol for sustainable aquaculture production. This paper presents an improved breeding and seed production technology for climbing perch. Mature climbing perch were induced to spawn using salmon gonadotropin-releasing hormone analog (sGnRHa) at a dose of 30 µg/kg-1 body weight of the breeder. The female broodfish spawn 9–10 hours after hormone injection. Developmental stages were defined based on the morphological features of the embryos from the first cleavage to the hatching stage. The first cleavage began at approximately 18–20 minutes after fertilization. Newly hatched larvae were observed within 18–20 h at 30°C, having an average larval size of 0.389±0.042 mm (total length). Successful breeding entails a selection of suitable algal species, an optimal aquaculture environment, regular feeding rates, consistent monitoring of larval development, and effective management of water quality. Survival rates from the larval stage to fry were achieved at 84.69% and 77.60%, respectively, while the survival rate to the fingerlings stage was 72.51%. Therefore, by implementing an optimized protocol, aquaculture practitioners can maximize the production potential of climbing perch while ensuring sustainable cultivation practices. The findings from this research contribute to the advancement of climbing perch aquaculture by providing valuable insights for the successful cultivation and increased economic profitability of A. testudineus species in hatchery productions