| Studies were carried out in laboratory from 26 to 29℃ on the gastric evacuation rate of young crimson snappers Lutjanus
erythropterus, with their weight being at 2.53 (±1.30)g and body length at 37.40 (±6.84) mm respectively. The special growth rates and relative fatness indices of young crimson snappers L. erythropterus were also studied, which were fed with flesh Penaeus nonodonr, flesh Saurida tumbil and compound fish feed, respectively. The Elliott-Persson model was used to determine its feeding rates to quantify its gastric evacuation rate and food conversion efficiency. The results showed that, when fed with compound fish feed, the young crimson snappers had a peak at 18:00. And its Gastric Content Weight (GCW) as a percent of body weight with the time of day (T) fit the formula GCW=-0.472T+4.222（R2=0.72）, at a evacuation rate of 0.472 g per 100 g (body weight) per hour，so the daily diet food consumption was 22.62 g per 100 g (body weight), yielding the food conversion efficiency of 6.85% in biomass. The 18 days culture experiment of young crimson snappers fed with three different foods was studied. The results showed that the special growth rate (SGR) and survival rate of
snappers in group I which fed with flesh P. nonodonr was 1.58% and 90% per day，and the SGR of fish fed with compound fish feed and S. tumbil was 1.55% and 1.22%, respectively, but their survival rate were comparatively low, with 75% and 72.5%. It’s beneficial to the survival rate of the young snappers feeding with some flesh P. nonodonr. Feeding rhythm of twice per day and keeping satiation ration at 18:00 were suitable for the growth stage of the snapper. |
