Growth of grass carp, Ctenopharyngodon idella Val., fed on two terrestrial fodder plants

Abstract

Studies on the growth rate of grass carp, Ctenopharyngodon idella Val., fed on the leaves of two terrestrial fodder plants, lucerne, Medicago sativa L., and drumstick, Moringa pterygosperma, were carried out in cement cisterns. The grass carp had gained ah average net weight of 177g and 111 g with an overall specific growth rate of 3-17 and 2-78% per day when fed on lucerne and drumstick leaves respectively in a period of 120 days. Feed conversion ratios were 13-9:1 in lucerne as against 10-2:1 in drumstick leaves. The percentage acceptance of drumstick leaves as feed was lower than lucerne. However, superior feed conversion was observed in fish fed on drumstick leaves. The average net production of grass carp fed on lucerne was higher than the drumstick leaves. Fish fed on drumstick leaves, however, gave better economical returns.

Statistical aspects of aquaculture research: optimum block size in pond experiments

“…Here 12 ponds were used, but literature reports use of even fewer ponds: 10 in the experiment of Hepher, Milstein, Leventer & Teltsch (1989), 6 by Devaraj, Keshavappa & Manissery (1986) and 4 by Raat (1991). With less than 8 residual degrees of freedom, the estimate of the underlying variability is imprecise so, where possible, designs with more than 8 degrees of freedom for error should be chosen.…”

Effect of Partial Replacement of Fishmeal with Duck Weed (Lemna minor) Feed On the Growth Performance of Cyprinus carpio Fry

“…In the past few decades, feeds from plant origin have been accepted for Indian major carps because the growth observed in these fish has been reported to be as good as that obtained with the traditional feed. In tropical developing countries, where algal production rates are high, algae have been receiving increasing attention as an alternate protein possessing relatively high protein content (50-65% ), which may be included in balanced fish feeds [19].…”

“…As a result, use of supplementary feed has become inevitable for the carrying capacity of culture systems and can enhance fish production by many folds [1].One important aspect in common carp farming is to identify economically viable and easily available ingredients for formulating diets that are nutritive palatable and having maximal conversion ratio to give greater fish yield per application. Feed conversion ratio (FCR) values of various fish feeding ingredients for carps under controlled conditions have been estimated by many workers [2,3,4,5].…”

Fish scenario in India with emphasis on Indian major carps

“…It is easy to induce this species to spawn. 8 Because of its slow growth rate as compared to major carps, it is generally not included in polyculture systems. Day (1878 and 1889).…”