Received: 22-08-2023
Accepted: 20-11-2023
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Species Composition and Distribution of Zooplankton in the Shrimp-Mangrove Field in Ngoc Hien District of Ca Mau Province
Keywords
Density, mangroves, species composition, zooplankton
Abstract
The present study aimed to assess the species composition and distribution of zooplankton in the shrimp-mangrove fields at Ngoc Hien district, Ca Mau province. Samples were collected monthly from January to December 2022. At each sampling time, qualitative and quantitative samples of zooplankton were collected in 3 integrated shrimp-mangrove fields (3 points/field). Based on the morphological characteristics and external structure of zooplankton, the findings found 26 species of zooplankton belonging to 17 genera, 17 families and 5 different groups, viz.luding Protozoa, Rotifera, Cladocera, Copepoda and meroplankton were recorded. The number of zooplankton species in each month varied from 7 to 12 species, and the density ranged from 22,065 to 769,725 ind./m3. The highest density of zooplankton was found in June with a mean of 769,725±541,622 ind./m3. The species composition and abundance of zooplankton during the rainy season werehigher than those in the dry season. The distribution of Rotifera and Cladocera groups in the shrimp-mangrove fields was affected by salinity. The results found a number of zooplankton species such as Brachionus angularis, Brachionus plicatilis, Philodinasp., Diaphanosomasp., Oithonasp. and nauplius larvae of Copepoda had the potential as good food sources, that can be used for increasing biomass production and enrichment techniques for crustacean and fish larvae at the nursery stage.
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