Combined Nitrogen and Phosphorus Fertilization for Controlling the Toxigenic AlgaPrymnesium parvum

Autor:	Gerald L. Kurten, Drew C. Begley, Aaron Barkoh, Loraine T. Fries
Rok vydání:	2007
Předmět:	Ammonium sulfate Phosphorus chemistry.chemical_element Aquatic Science Biology biology.organism_classification chemistry.chemical_compound Nutrient Animal science chemistry Algae Prymnesium parvum parasitic diseases Botany Fish hatchery Ammonium chloride Fish kill
Zdroj:	North American Journal of Aquaculture. 69:214-222
ISSN:	1548-8454 1522-2055
DOI:	10.1577/a06-027.1
Popis:	The toxigenic alga Prymnesium parvum has caused significant fish kills in Texas reservoirs and fish hatchery ponds since 2001. Copper sulfate and ammonium sulfate can control P. parvum, but they provide short-term improvement and have undesirable side effects. Copper sulfate also kills desirable algae and invertebrates, and ammonium sulfate can be harmful to fish. Because dominance of the phytoplankton community and toxin production by P. parvum appear to be nutrient related, we evaluated two nitrogen (N) and phosphorus (P) fertilization regimes for their efficacy in controlling P. parvum populations and toxicity. The experiment included two N:P fertilization treatments (300:30 or 300:60 μg/L three times weekly) and an unfertilized control group conducted in limnocorrals suspended in a fish hatchery pond. Ammonium chloride (NH4Cl) and phosphoric acid (H3PO4) were used as the sources of N and P, respectively. In the unfertilized control, P. parvum cells and toxicity persisted throughout the 40-d e...
Databáze:	OpenAIRE
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