S.M.  Majharul Islam, Md.  Sulaiman, Md.  Jahangir Alam, 
    Phytoplankton Zooplankton Interrelationship Between Two Ponds and Effect of Seasonal
Fluctuations on their Abundance,
    Journal of Fisheries International,
    Volume 15,Issue 1,
    2020,
    Pages 7-13,
    ISSN 1817-3381,
    jfish.2020.7.13,
    (https://makhillpublications.co/view-article.php?doi=jfish.2020.7.13)
    Abstract: Physico-chemical parameter and plankton such 
as phyto and zooplankton have been studied in selected 
two ponds in Dumkiupazila in Patuakhali district. 
Physico-chemical parameter plays a vital role in aquatic 
community. Their growth and productivity rate directly 
affected by those parameters. Phyto and Zooplankton that 
constitute an important food supplier of many omnivorous 
and carnivorous fishes. Moreover, it has a great impacts 
to control biological activity, oxidation and organic 
compounds. The study was carried out both culture and 
non-culture aquatic resource. There are about 4 groups of 
zooplankton where Copepoda (40.08%), Maxillopoda 
(38.83%), Malacostraca (16.29%), Branchiopoda (4.8%) 
and 10 groups of phytoplanktonwere identified where 
Bacillariophyceae (29.65%), Euglenophyceae (1.34%), 
Spirotrichea (2.20%), Cyanophyceae (25.88%), 
Surirellaceae (0.74%), Chlorophyceae (1.13%), 
Zygnematophyceae (3.30%), Ulotrichaceae (10.85%), 
Ulvophyceae (24.88%). Nauplius (38.83%) are the most 
abundant among all Zooplankton and Fragillaria (22.02%) 
are most among all phytoplankton. Physico-chemical 
parameters has a great impacts on plankton abundance. 
Some physico-chemical parameters such as: temperature, 
transparency, dissolved oxygen, pH, alkalinity, hardness, 
nitrate, ammonia were observed monthly. Mean values of 
water temperature (°C), transparency (cm), dissolved 
oxygen (mg L<sup>&#150;1</sup>), pH, alkalinity, hardness, nitrate 
(mg L<sup>&#150;1</sup>) and ammonia (mg L<sup>&#150;1</sup>) were 29.35&plusmn;1.68, 
36.71&plusmn;3.8, 4.90&plusmn;1.7, 7.19&plusmn;0.7, 95.14&plusmn;17. 19, 10.72&plusmn;2.27, 
0. 16&plusmn;0.08, respectively. Water temperature, ammonia, 
pH and phosphorus were optimum range in the 
investigation time. But the concentration of nitrate was so, 
high. Nitrate, ammonia and dissolve oxygen were 
responsible for water quality deterioration and great affect 
on the whole plankton production system. So, plankton 
abundance having a correlation with physic-chemical 
parameter and that has a diverse effect on the aquatic 
organisms.
    Keywords: phytoplankton;Physico-chemical parameters;zooplankton;abundance;pond