Madihah Jaffar Sidik (2007) Effects of cage culture on physical water properties, plankton communities and macrobenthos assemblage in Sepanggar Bay, Sabah. Masters thesis, Universiti Malaysia Sabah.
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Abstract
A study regarding the effect of cage culture on physical properties of water, abundance and distribution of plankton community and macrobenthos assemblage in Sepanggar Bay, Kata Kinabalu Sabah was conducted. Samples were collected from the nearshore, inside cage and offshore areas of the Sepanggar Bay covering three monsoons namely the North-east monsoon, Inter-seasonal monsoon and South-west monsoon. Temperature, salinity, pH and dissolved oxygen concentration were measured in situ using an YSI meter. Aquadrop profiler was used to measure the current velocity. Transparency was measured using a Secchi disc. Total suspended solids of collected water samples were determined in the laboratory using the drying, burning and weighing method. Phytoplankton and zooplankton were collected using a 20 µm mesh sized plankton net. Grab sampler were used to collect the macrobenthos. Current velocity, total suspended solids, temperature, salinity, pH, transparency and dissolved oxygen data ranged between 0.llm/s and 0.S0m/s, 0.0Sg/I and 0.26g/l, 29.11°C and 30.77°C, 30.03%0 and 31.93%0, 6.58 and 8.10, 3.00m and 5.20m, and 65.21 %-89.29% respectively. Total of 40 phytoplankton were recorded with Coscinodiscus spp having the highest concentration (36%). The average abundance of phytoplankton ranged between 1.19x106 cells/Land 6.61x106 cells/L. In the zooplankton community, a total 65 types of zooplankton were recorded with larval zooplankton having the highest (31%) concentration. The average zooplankton abundance ranged between 2.20x106 individuals/Land 5.59x106 individuals/L. Nassarius sp. were found to be highest in the macrobenthos community where, a total of 28 genera of macrobenthos were recorded. Average macrobenthos abundance ranged between 6.97x104 individuals/m3 and 2.83xl05 individuals/m3 A significant temporal variation was observed in the physical water properties while the differences for spatial variation were found to be statistically insignificant. However, field measurements showed lower velocity inside cage area which was due to the cage structure. As a result, the suspended solids were found higher inside the cage when compared to the nearshore and offshore areas. Phytoplankton genera, abundance and diversity values showed significant temporal variation ( except Margalef's Richness Index) while no significant differences were observed in the spatial distribution of phytoplankton. For zooplankton, significant temporal variation was observed only for Pielou Evenness Index and Margalef's Richness Index. No significant spatial difference was observed for genera, abundance and diversity values of the zooplankton community. Macrobenthos assemblage showed significant temporal and spatial differences in genera, abundance and diversity values. From the present study it was clear that temporal variation was present in the physical water properties, plankton community and macrobenthos assemblage in Sepanggar Bay. However, small variation in the spatial distribution of the different studied parameters indicated the insignificant effect of cage culture practices within and around the studied area.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Sepanggar Bay, Cage culture impact, Aquaculture environmental effects, Physical water properties, Current velocity, Total suspended solids |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling > SH1-691 Aquaculture. Fisheries. Angling > SH20.3-191 Aquaculture > SH151-179 Fish culture |
| Department: | INSTITUTE > Borneo Marine Research Institute |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 23 Sep 2025 17:29 |
| Last Modified: | 23 Sep 2025 17:29 |
| URI: | https://eprints.ums.edu.my/id/eprint/45206 |
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