Digestibility in Sarotherodon niloticus fry: Effect of dietary protein level and salinity with further observations on variability in daily digestibility

An evaluation of the method used in digestibility estimations of a dietary ingredient and comparisons on external and internal markers, and time of faeces collection in digestibility studies in the fish Oreochromis aureus (Steindachner)

“…amongst others, what remains controversial with respect to digestibility estimations in fish, are the use of internal and external markers (Bowen, 1978;De Silva and Perera, 1983; Tacon and Rodrigues, 1984) and the time of collection of faeces and consequent pooling of faecal samples for analyses (De Silva and Perera, 1984;Spyridakis et al, 1989). (Possompes, 1973).…”

Feeds, water quality, gut morphology and digestion in Nile tilapia (Oreochromis niloticus)

“…Protein digestibility decreased in milk fish (Chanos chanos) (Ferraris et al, 1986) and Arctic charr (Salvelinus alpinus) (Ringø, 1991) when moved from seawater to freshwater. On the other hand, Dabrowski et al, (1986) and De Silva and Perera (1984) noted that salinity had no significant effect on protein digestibility of rainbow trout (Salmo gairdneri) and Nile tilapia, respectively.…”

Performance of rohu, Labeo rohita (Hamilton), fingerlings maintained on alternate feeding of plant and animal protein based diets

“…Con ducting experiments on mixed feeding schedules, similar types of growth response have also been reported in common carp (Srikanth et al 1988;Nandeesha et al 1993). Existence of rhythmicity in digestibility of protein has been reported in Etroplus suratensis (De Silva and Perera 1983) and Oreochromis niloticus (De Silva and Perera 1984). Per era (1983, 1984) were, however, unable to trace a well defined rhythm in cichlids, and hence, De Silva (1985) adopted randomly determined feeding schedules to confirm its ex istence.…”