Relationships of dissolved oxygen with chlorophyll-a and phytoplankton composition in tilapia ponds
Date
2013-09
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Volume Title
Publisher
Scientific Research
Abstract
This study investigated the relationships among the parameters of dissolved oxygen, chlorophyll-a and phytoplankton composition in tilapia ponds. Each pond (a total of 18 ponds) was sampled once in the dry, winter season between Jan-uary and March and again early in the rainy season between May and June. The data were analyzed by examining cor-relations among parameters as affected by season, altitude and culture system. Observations were made at sites located in 5 selected provinces of northern Thailand: Chiangrai, Chiangmai, Phayao, Lampang and Nakornsawan. Mean eleva-tion of these areas range from 25 to 582 meters above sea level (masl) and were categorized into low (<400 masl) and high (>400 masl) elevation sites. Ponds were 0.8 - 2.0 m deep, 0.16 - 0.64 ha in area and could be further categorized into high and low input systems.Mean air temperature in winter ranged between 16.5˚C - 35.8˚C while mean water temperature ranged between 25.5˚C - 27.1˚C. In rainy season, air temperature ranged between 22.0˚C - 37.3˚C and wa-ter temperature ranged between 29.4˚C - 31.8˚C. The amount of chlorophyll-a in both seasons were comparable (p > 0.05), but chlorophyll-a in high input system was significantly higher (p < 0.05) than in low input ponds. Only weak correlation was found between chlorophyll-a, DOmax and DOmin. Multifactor-ANOVA was used to analyze the differ-ence of total bacteria and filamentous cyanobacteria in ponds based upon elevation, culture systems and season. Result shows that there is a significant interaction observed between elevation, culture system and season (p < 0.05). Species diversity and composition of phytoplankton in fish ponds in 2 seasons revealed the presence of 90 genera of phytop-lankton under all 7 divisions. Divisions Chlorophyta and Cyanophyta had the most number of genera identified in both seasons with Pediastrum spp., and Scendesmus spp., and Anabaena spp. as dominant genera/genus, respectively.
Description
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Journal Article (peer-reviewed)
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Keywords
DISSOLVED OXYGEN, CHLOROPHYLL-A, PHYTOPLANKTON COMPOSITION, TILAPIA PONDS, ELEVATION, SEASONS, THAILAND, AQUACULTURE TECHNIQUES, CLIMATE SENSITIVE DISEASES, FISH PRODUCTION, ENVIRONMENTAL HEALTH, WATER QUALITY, OREOCHROMIS NILOTICUS L
Citation
Kunlasak, K., Chitmanat, C., Whangchai, N., Promya, J., & Lebel, L. (2013). Relationships of Dissolved Oxygen with Chlorophyll-a and Phytoplankton Composition in Tilapia Ponds. International Journal of Geosciences, 4, 46-53. http://dx.doi.org/10.4236/ijg.2013.45B008