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The impact of winter storage of live carp on discharge water quality
Author(s) -
Stibranyiová I.,
Adámek Z.
Publication year - 1998
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1998.tb00620.x
Subject(s) - nutrient , water quality , zoology , carp , biology , grass carp , chemical oxygen demand , environmental science , fishery , fish <actinopterygii> , ecology , environmental engineering , wastewater
Summary Changes in water quality were studied in two flow‐through winter storage facilities for carp from October 1994 to April 1995 (173 days), where unfed marketable carp (1.7 ± 0.3 kg) from the autumnal pond harvest were held before marketing. The quality characteristics of the inflow and outflow water and organic and nutrient loadings were summarized. Water quality parameters appeared to be affected little in these rearing conditions. The storage facilities had no serious environmental effects, particularly when using a water flow rate greater than 2.6 L t ‐1 s ‐1 and a storage time exceeding 30 or 100 days. Dissolved oxygen (DO) uptake resulted in 410 g per tonne of fish biomass per day (gt ‐1 day ‐1 ) for an average flow rate of 1.7Lt ‐1 s ‐1 and was related to the flow rate (P < 0.05) and storage time (P <0.01) of the carp. On average, pH values fell by 0.15 units and relationships between pH and temperature (P< 0.001), storage time (P<0.01) and DO uptake (P < 0.001) were indicated. The amount of organic matter released into the water was 37 and 69g t ‐1 day ‐1 in the case of biochemical oxygen demand (BOD) and chemical oxygen demand (COD), respectively. Correlations between BOD production and water temperature and storage time were registered (P < 0.01). Nutrient enrichment reached 18g t ‐1 day ‐1 as total ammonia N, and 1 and 9 g t ‐1 day ‐1 as orthophosphate and total P, respectively; all were accompanied by high variability in the data.