| Author: | |
| Roll: | BKH1602058F |
| Batch | 12th batch |
| Session | 2016-17 |
Abstract:
Phytoplankton and zooplankton plays a key indicator in culture pond productivity. Tilapia is a popular fish for aquaculture as it is very versatile and is tolerant of a variety of aquaculture environments; it can be farmed in brackish or salt water and also in pond or cage systems. However, the phytoplankton and zooplankton communities in the culture ponds in Noakhali region are nearly undetermined in Bangladesh. This study summarizes the phytoplankton and zooplankton diversity, assemblage and physico-chemical parameters of the GIFT and Non GIFT Tilapia culture ponds in Noakhali Science and Technology University, Bangladesh, based on four seasons. The results revealed that significant differences (p < .05) were found in pH, DO, conductivity, TDS, nitrites, phosphates and temperature in all season. A total of 65 phytoplankton genera representatives of eight major groups were recorded such as Chlorophyceae (32.31%), Cyanophyceae (20%), Bacillariophyceae (30.77%), Euglenophyceae (6.15%), Dinophyceae (4.62%) Cryptophyceae (1.54%), Xanthophyceae (1.54%) and Trebouxiphyceae (3.08%) . A significant difference (p < .05) in phytoplankton abundance was found in four seasons with the highest density of 500× 103 cells L-1 and the lowest density of 33.333×103 cells L-1. Maximum density of zooplankton was 300×103 units L-1 and the minimum was 33.333×103 units L-1. The diversity (H’), evenness (J’), richness (d) and dominance (D) of phytoplankton ranged from 2.348 to 3.037, 0.5738 to 0.7698, 1.139 to 2.212 and 0.06224 to 0.1156 respectively. The diversity (H’), evenness (J’), richness (d) and dominance (D) of zooplankton ranged from 0 to 1.494, 0.7015 to 1, 0 to 0.328 and 0.241 to 1 respectively. Canonical correspondence analysis (CCA) revealed that phytoplankton and zooplankton genera were highly correlated with physico-chemical parameters. CCA also revealed significant correlation between phytoplankton and zooplankton genera. Pearson’s correlation coefficient revealed that phytoplankton abundance, diversity and community were mainly governed by dissolved oxygen and TDS, conductivity, temperature and ammonia.