Economic Zooplankton : Seasonal Variation in the Inner Gulf of Thailand during 2009-2011
Abstract
Seasonal variations of economic zooplankton in the Inner Gulf of Thailand were investigated during 2009-2011. Twenty-two stations were grouped in to 5 areas, namely, river mouth, east coast of inner gulf, west coast of inner gulf, middle gulf and outer of the inner gulf. The results showed that seven groups of economic zooplankton were found as shrimp larvae, alima larvae, zoea and magalopa, phyllosoma larvae, bivalve larvae, gastropod larvae, and fish egg and fish larvae. Comparing with areas of study, the highest average density of economic zooplankton found in the east coast of inner gulf (13.37X103 ind/100 m3), followed by the outer of inner gulf (11.95X103 ind/100 m3), river mouth (10.43X103 ind/100 m3), and middle gulf (7.96X103 ind/100 m3), respectively. The west coast of inner gulf had the lowest at 7.00X103 ind/100 m3. While seasonal variation of these economic zooplankton in the dry season mostly found higher than those in the rainy season except fish egg and fish larvae. The density of these zooplankton revealed in the dry and rainy season of 10.63X103 ind/100 m3 and 9.49X103 ind/100 m3, respectively.
Keywords : economic zooplankton, season, abundance, distribution, Inner Gulf of Thailand
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