English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40649
Visitors : 643937      Online Users : 49
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44674

Title: Can algicides be used to kill the toxic dinoflagellate, Alexandrium minutum, in aquaculture ponds?
Authors: Su, H. M.;Su, M.S.;Liao, I C
Keywords: dinoflagellate;algicides;pond management
Date: 1996
Issue Date: 2017-11-24T03:14:54Z
Publisher: Acta Oceanographica Taiwanica
Abstract: Abstract:
Alexandrium minutum is a toxic dinoflagellate that causes paralytic shellfish poisoning (PSP). It is distributed in the coastal waters of southwestern Taiwan and often also occurs in fish ponds in Pingtung county. It caused the PSP incidents which resulted in human death in 1986 and illness in 1991. Moreover, mass mortalities of various species such as, culture grass prawn (Penaeus monodon) in 1989, milkfish (Chanos chanos) in 1992 and 1995, gray snapper (Lutjanus argentimaculatus) in 1992, and long dorsal fin pompano (Trachinotus blochii) in 1993 were also observed when this particular algae bloomed. Hence, controlling its occurrence as well as reducing its density in aquaculture ponds has become extremely important for proper management of water quality. Chemicals which are commonly used as algicides in aquaculture ponds were first selected to test their effectiveness toward destruction of A. minutum. The effectiveness of chemicals such as BKC, (NH4)2SO4, CuSO4 5H2O, KMnO4, formalin, methylene blue and malachite green which are commonly used as algicides to destroy A. minutum depends on both the dosage as well as algal density. Amongst the tested algicides, NH4-N (5-14 ppm) and BKC (0.5-2 ppm) were found to be the most effective, followed by 2 ppm methylene blue and 0.2 ppm malachite green. CuSO4 5H2O (0.5-10 ppm), KMnO4 (1-10 ppm), and formalin (20-100 ppm) were, however, less effective. It may hence be inferred that, NH4-N and BKC can be effectively used to destroy A. minutum. However, 14 ppm NH4-N is harmful to certain species of fish such as red drum Sciaenops. ocellatus. Besides, addition of NH4-N or BKC can enhance the toxic effect of pond water due to the toxins released from the destroyed algal cells. Thus, the best method to control the bloom of A. minutum in culture ponds is to exchange a large volume of pond water either with fresh seawater or some other pond water which does not contain any toxic algae.
Relation: 35(3), pp.257-265
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44674
Appears in Collections:[廖一久院士專區] 期刊論文

Files in This Item:

There are no files associated with this item.

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback