Studies on phyto-and-zooplankton
composition and its relation to fish productivity in a west
coast fish pond ecosystem
Kwan Soon
Park and Hyun Woung Shin*
Department of Marine
Biotechnology, Soonchunhyang
University, Asan City
- 336-745, South Korea
(Received:
June 21, 2005 ; Revised received: February 11, 2006 ; Accepted: March 30, 2006)
Abstract: A fish pond ecosystem on the west coast
of Korea
was studied for biotic and abiotic factors. The
occurrence rate of phytoplankton at the embanked fish farm was 84 times higher
to that of shore waters. Phytoplankton species which occurred during the study
period were categorized into Cyanophyta, Dinophyta and Bacillariophyta
with a total of 26 subgeneric taxa
(22 species of Dinophyta, 2 species of Bacillariophyta and 2 species of Cyanophyta).
The total cell density during the study period ranged from16 ? 103 to
13.59 ? 105 cells l-1. As for the zooplankton, the
monthly density ranged from 26 - 8.684 ? 103 cells m-3 with
an average of 126.0? 103 cells m-3 for April. In the case
of May, it ranged from 41 - 3.331 ? 103 cells m-3 and its
average of 50.3 ? 103 cells m-3 which was comparatively
less. The varying environmental factors in Seosan
embankment A, B and Chonsu Bay
waters could have affected the fish farm. According to the results, the
concentration of inorganic nitrogen was 0.067 - 0.106 (average: 0.083) mg l-1
and the concentration of organic nitrogen was 0.008 - 0.022 (average:
0.014) mgl-1. Also due to the release of
brackish water at Seosan embankment A and B, the
inorganic nitrogen showed an increasing trend. The survival rate of Sabastes schlegeli, and Acanthopagrus schlegeli was high
in stations 2H and I (20.87%, 33%) and relatively low in stations 2B to 2F.
Key words: Fish pond, Fertilizer, Hydrography, Phytoplankton, Zooplankton
Copyright ? 2007 Triveni Enterprises. All rights reserved. No part of the
Journal can be reproduced in any form without prior
permission. Responsibility regarding the authenticity of the data, and the
acceptability of the conclusions enforced or derived, rest completely with the
author(s).
