罗非鱼对水质的影响

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Abstract

Fish can affect the quality of water in reservoirs.Tilapia is one of the main aquaculture fishes in southern China.This study evaluated the effect of tilapia on water quality using enclosure experiments in Dajingshan Reservoir.The results showed that fish increased the mean total nitrogen(N),total phosphorus(P) and chlorophyll a content by 42%,129% and 347%,respectively.It was likely that fish excretion increased nutrient loading and enhanced phytoplankton growth.While phytoplankton biomass increase would lead to a decrease of water transparency.The results indicate that the bottom-up control on phytoplankton through fish excretion is stronger than the top-down effects through fish grazing.

Key words： tilapia water quality enclosure reservoir

Received: 25 December 2008

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	Articles by authors
	LIU Hui
	XIE Yi-fa
	ZHANG Xiu-feng
	ZHONG Ping
	LIU Zheng-wen

Cite this article:

LIU Hui,XIE Yi-fa,ZHANG Xiu-feng, et al. The effect of tilapia on water quality[J]. , 2008, 27(6): 494-498.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2008/V27/I6/494

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