Comparisons of Single Moist Pellet and Mainly-Raw-Fish Moist Pellet on the Growth, Feed Efficiency, and Protein Digestibility of Yellowtail in Low Temperature Period.

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In order to investigate the growth performance of formula feed (mash type) on the growth, feed efficiency, and protein digestibility of yellowtail, <I>Seriola quinqueradiata</I>, in low temperature period, the fish were reared on three different diets, 1) a single moist pellet diet (SMP), 2) a protease-treated single-moist-pellet fish meal (E-SMP), and 3) a mainly-raw-fish moist pellet diet (RF-MP) for 130 days from October to February.<BR>Growth, feed efficiency, and protein efficiency ratio were the highest in fish fed RF-MP; E-SMP gave higher values than SMP. Although pepsin-like and trypsin-like activities were the lowest in fish fed RF-MP, protein digestibility was the highest in fish fed RF-MP, and it was slightly higher in fish fed E-SMP than SMP. These results indicated that the growth performance of the fish fed the formula feed was lower than that fed RF-MP in low temperature period. This was thought that lower water tempareture directly decreased protein digestibility of formula feed although fish increased their digestive enzyme activities to adopt the formula feed.
日本水産増殖学会の論文