Milkfish Production and Ecology of Brackishwater Ponds Treated with Organic Versus Inorganic Fertilizers in Cochin, India
Milkfish Production and Ecology of Brackishwater Ponds Treated with Organic Versus Inorganic Fertilizers in Cochin, India
Date
1994
Authors
Joseph, Aneykutty
Vadhyar, K. Jayasree
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India)Cochin
Abstract
The paper deals with a comparative study of growth, survival and yield of milkfish
as well as the ecological characteristics of two brackish water culture ponds (0.042 ha each),
one treated with organic fertilizer (cowdung) and the other with inorganic fertilizers
(superphosphate and urea). Milkfish, Chanos chanos of 6 g average weight were stocked at
a rate of 4500 fingerlings ha'1 in both the ponds. Remarkably better growth of fish (238 g),
86% of survival and gross and net productions of 852 and 825 kg ha"1 respectively, were
obtained after 120 days of culture from the pond treated with cowdung, than from the pond
treated with inorganic fertilizers which showed a growth of only 63 g, survival of 82% and
gross and net productions of 226 and 199 kg ha0, respectively during the same period. The
operational economics of milk fish production from the ponds has been compared. The rate
of return on operational costs works out to be 298% in the pond treated with cowdung and
3% in the pond treated with chemical fertilizers
Description
Keywords
Milkfish Production, Ecology, Brackishwater Ponds, Organic Versus Inorganic Fertilizers, Cochin India
Citation
Fishery Tech 31(2):95-101