A web-based combined nutritional model to precisely predict growth, feed requirement and waste output of gibel carp (Carassius auratus gibelio) in aquaculture operations

摘要

Aquaculture nutritional models play a vital role in the management of fish culture operations. This study reported a combined nutritional model constructed based on the data from several fish farms and published studies in order to predict the growth, feed requirement and waste output of gibel carp (Carassius auratus gibelio) and the web-based model service platform. This combined model comprised a growth model, a feed requirement model and waste (nitrogen and phosphorus) output model. The performance of different growth models and the growth trajectory of gibel carp were analyzed based on growth data obtained from two fish farms in Jingzhou, Ningbo (China) and published studies. The least squares method was used to optimize the growth coefficient within each growth stanza and to choose the best fit of growth model, which was the thermal-unit growth coefficient (TGC) model. Three growth stanzas of gibel carp in its life cycle were found by using TGC model, which were from firstfeeding (1 g) to 13.5 g (Stanza 1); from 13.3 to 175.5 g (Stanza 2); and & 175.5 g (Stanza 3). Feed requirement of fish in different growth stages were determined by digestible energy requirement (DEreq), estimated based on the summary of recovered energy (RE), basal metabolism (HeE), heat increment of feeding (HiE), and urinary and branchial excretion (UE+ ZE). Nutrient mass balance method was used to estimate waste output when the different growth stages of gibel carp was fed with different diets.