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United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
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Nile Tilapia And Blue Tilapia Fry Production In A Subtropical Climate Based On Degree Days, Bartholomew W. Green, Esam H. Rizkalla
Nile Tilapia And Blue Tilapia Fry Production In A Subtropical Climate Based On Degree Days, Bartholomew W. Green, Esam H. Rizkalla
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
The relationship between production in subtropical earthen ponds of fry suitable for hormonal sex inversion and degree days was quantified for Nile tilapia (Oreochromis niloticus; Egypt strain) and blue tilapia (O. aureus). Degree days were calculated for each trial as the sum of mean daily water column temperature minus the reference temperature, 15◦C. No fry from either species were harvested at fewer than 124–126 degree days. Total fry production for each increased linearly as cumulative degree days increased from 129 to 281 degree days. Production of fry suitable for hormonal sex inversion was positively related to …