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Aquashade(R) Treatment of Channel Catfish Ponds
Author(s) -
Boyd Claude E.,
Hanapi Md,
Noor Md
Publication year - 1982
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1982)2<193:atoccp>2.0.co;2
Subject(s) - ictalurus , catfish , zoology , hectare , fish pond , fishery , water quality , environmental science , fish <actinopterygii> , secchi disk , biology , fish farming , aquaculture , ecology , nutrient , eutrophication , agriculture
Three channel catfish (Ictalurus punctatus) ponds were treated with 4 mg/liter of the dye, Aquashade(R), and three ponds served as controls. The dye imparted a blue color to waters, but it did not appreciably affect Secchi disk visibilities. Decline in Aquashade(R) concentrations with time resulted primarily from seepage—concentrations decreased by about 0.75 mg/liter each month from April to August. Chlorophyll a concentrations and coverage of pond bottoms with underwater weeds did not differ significantly between dye‐treated and control ponds. Average dissolved‐oxygen concentrations were higher at dusk in control ponds than in treated ponds, but concentrations of dissolved oxygen at dawn did not differ between treated and untreated ponds. A fish kill, unrelated to the treatment, resulted in loss of fish‐production data from one of the treated ponds. Net fish production averaged 3,010 kg/hectare in the three control ponds and 3,641 kg/hectare for two of the dye‐treated ponds. Because no improvement in water quality resulted from treatment, the greater fish production in the treated ponds likely was related to random variation rather than to the application of Aquashade(R).