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Variation of limnological parameters in a tropical lake used for tilapiacage farming

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tThe aim of this study was to assess the effects of tilapia cage culture on the water quality and sedimentof Palminhas Lake during both the dry and rainy seasons. Eight sites within the lake (four in fish farmsand four in areas without fish farms) and one site on an affluent stream were sampled monthly fromFebruary 2011 to January 2012. Dissolved oxygen and pH were significantly lower at fish farm sites thanat locations without farms, while chlorophyll a was higher at fish farm sites. Moreover, large seasonalvariations were observed, which were not related to the fish farms. The Secchi disc depth and ammonianitrogen level were significantly higher during the dry season, but temperature, dissolved oxygen, pH,total phosphorus and chlorophyll a were significantly higher during the rainy season. The affluent streamcontributed substantially to lake eutrophication. Palminhas Lake is mesotrophic and has exhibited aprogressive worsening in water quality over the past 20 years. These changes were not caused by fishfarming alone but probably by other anthropic activities in the areas surrounding the lake.

Keywords:Aquaculture Phosphorus Chlorophyll aSeasonal variation

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Ketersediaan

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Informasi Detail

Judul Seri

Aquaculture Reports

No. Panggil

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Penerbit

: Elsevier., 2015

Deskripsi Fisik

Aquaculture Reports 2 (2015) 152–157

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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