Seasonal fluctuations in the flux of particulate organic matter discharged from net pens for fish farming

Fish farming using net pens consumes large amounts of food for the reared fish, resulting in organic enrichment of the sediment below the fish farm from organic discharge in the forms of fish feces and food residues. Sediment traps were set at a net pen within and outside a fish farm, and organic fl...

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Bibliographic Details
Published in:Fisheries science 2006-02, Vol.72 (1), p.119-127
Main Authors: Tsutsumi, H.(Kumamoto Prefectural Univ. (Japan)), Srithongouthai, S, Inoue, A, Sato, A, Hama, D
Format: Article
Language:English
Subjects:
ALIMENT POUR ANIMAUX
Aquaculture
Autumn
CAGE CULTURE
CULTIVO EN JAULAS
CULTURE EN CAGE
FAECES
Farming
FECES
FEEDS
fish farming
Fish farms
Fluctuations
Food
HECES
Marine
MATERIA ORGANICA
MATIERE ORGANIQUE
Nitrogen
Ocean floor
Oceanography
Organic carbon
organic enrichment
organic flux
ORGANIC MATTER
organic particulate
Pagrus major
Particulate organic matter
PECES MARINOS
PIENSOS
POISSON DE MER
red sea bream
SALTWATER FISHES
SEASONAL VARIATION
SEDIMENTACION
SEDIMENTATION
Sediments
VARIACION ESTACIONAL
VARIATION SAISONNIERE
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Summary:Fish farming using net pens consumes large amounts of food for the reared fish, resulting in organic enrichment of the sediment below the fish farm from organic discharge in the forms of fish feces and food residues. Sediment traps were set at a net pen within and outside a fish farm, and organic flux on the sea floor was compared. The year‐mean organic flux to the sea floor caused by fish farming from September 2003 to September 2004 was estimated at 2.11 gC/m2/day in total organic carbon (TOC) and 0.26 gN/m2/day in total nitrogen (TN), which were 2.5 times (TOC flux) and 2.2 times (TN flux) larger than that for natural organic flux outside the fish farm. The seasonal fluctuation patterns of organic flux to the sea floor below the fish farm did not necessarily coincide with those for the amount of food spent for the fish farming. The largest organic flux to the sea floor occurred in the autumn, when the vertical mixing of the water had just started. Therefore, organic enrichment of the sediment on the sea floor of a fish farm proceeded during this season.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2006.01125.x