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Phosphorus, total ammonia nitrogen and chlorophyll a from fish cages in a tropical lake ( L ake P alminhas, E spirito S anto, B razil)
Author(s) -
Venturoti Graciele P,
Veronez Alexandra C,
Salla Rômulo V,
Gomes Levy C
Publication year - 2016
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12502
Subject(s) - nile tilapia , oreochromis , wet season , fish farming , biology , chlorophyll a , fishery , transect , phosphorus , plankton , tilapia , subtropics , dry season , environmental science , aquaculture , ecology , fish <actinopterygii> , botany , materials science , metallurgy
Abstract Cage fish farming in natural and artificial lakes has become increasingly popular in recent years in tropical countries. The most commonly farmed tropical fish species is the N ile tilapia ( O reochromis niloticus L.). The aim of this study was to characterize the concentration of phosphorus, total ammonia nitrogen and chlorophyll a from existing fish farms ( FF ) in L ake P alminhas, located in L inhares/ ES , B razil. Three transects were drawn from 0 to 500 m from each of the four FF ( FF 1 to FF 4) in the lake during six trials (three in the rainy season and three in the dry season). The lake presented a monomictic‐hot pattern, with stratification during the rainy season. Dilution of the monitored parameters did not occur sufficient over a distance of up to 500 m from the FF . The location of the FF in the lake and the input of N and P were critical to ensure optimal mixing conditions because the worst results was observed for the fish farm ( FF 1) located on a finger of the lake, where the highest concentrations of total phosphorus and chlorophyll a occurred. It was also noted that there was possible total phosphorus interference between FF 3 and FF 4. The results of this study demonstrate that L ake P alminhas had a low dilution power, and these findings may inform environmental assessments of cage fish farming in this region, providing instruments that may support environmental control of cage fish farming.