ECOLOGICAL AND F SHE INVEST GATIONS OF THE NOZHA HYDRODRO IE NE ALE RIA, EG 20 -2001.

ECOLOGICAL AND F SHE INVEST GATIONS OF THE
NOZHA HYDRODRO IE NE ALE RIA, EG
20 -2001.
2. PHYTOPLANK ONABU VA CEAND STRUCTURE UNDER
TH INFLUE CE OF ‘E T UZE APPLICATION IN THE
NOZHA HYD OD OME, FISH FARM.
By
oJr1Jl………,uA M. GBARIB*

*National Institl/te ofOceanography and Fisheries. Ale. andria. Egypt.
ey wor s: Noz By dro o • s ecies dive ity in ex.
ABSI’. CT
Phytoplankton abt ndance and S /”lIctlire were studied monthly
from August 200 to September 2001 in the Nozha Hydrodrome
(a model offish fann) and in the adjacing Mahmoudia feeding canal
Compared with the previous work. changes were observed in both
the Sl!1lcmre and magnitude of ph.vtoplankton standzng crop in the
hydrodrome due to the application offenilizet.’s. A toral of 116 species
were recorded from the hydrodrome. comprising 39 Chlorophyceae.
37 Bacillariophyceae. 27 Cyanophyceae. 11 Euglenophyceae. one
species belonging to each of Dinophyceae and CryplOphyceae were
recorded. The hydrodrome had a chlorophycean character. The green
algae fOl7nea about 92% ofthe total counts with an obvious bloom of
Crucigenia rectangularis extending during wimer.
The species diversity as well as species richness were low during
winter and high in autumn and summer. No nuisance blue-green algal
bloom was observed during the course ofpresent swdy.