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- W2973064592 abstract "Abstract In aquaculture, the replacement of dietary fish meal (FM) with plant protein is becoming more common because FM resources are limited. However, reducing the dietary FM level often causes low feed intake followed by low fish growth. Improving feed intake (appetite) is important in the use of a low- or non-FM diet. The appetite of fish is intricately regulated by orexigenic and anorexigenic factors in the central and peripheral nervous systems. Neuropeptide Y (NPY), an orexigenic hormone found in fish, is strongly associated with appetite. However, it is still unknown whether appetite is regulated by not only nutrients but also smell and/or taste of FM. In this study, the npy mRNA expression response to the detection of a fish meal soluble fraction (FMS), including smell and/or taste of FM, through the sensory organs (olfaction and gustation) and to feeding with an FM-based diet were investigated in yellowtail Seriola quinqueradiata. In a 7-day feeding test, FMS supplementation to non-FM diet improved feed intake, which showed that FMS works as a feeding stimulant. In both FMS addition (into rearing water) and FM diet feeding tests, expression of npy mRNA in all the regions of the brain increased significantly with fasting; then decreased within only 10 min from smell and/or taste of FM through the sensory organs. A notable npy response was observed in hypothalamus at 180 min, in which npy mRNA recovered to almost the same level as that of 0 min with the addition of FMS, whereas with the FM diet, it did not recover and maintained low expression levels. At 180 min, telencephalic npy mRNA expression showed the opposite response to that in the hypothalamus. This study is probably the first to indicate that smell and/or taste of FM might regulate brain npy mRNA expression in the short term. Moreover, different hypothalamic and telencephalic npy mRNA expression responses between treatments at 180 min suggested that npy is also regulated by absorbed nutrients. These data suggest that smell and/or taste also might regulate appetite through npy in yellowtail." @default.
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- W2973064592 date "2020-01-01" @default.
- W2973064592 modified "2023-09-27" @default.
- W2973064592 title "Neuropeptide Y expression in response to sensory organ-detected fish meal soluble components and orally fed fish meal-based diet in yellowtail Seriola quinqueradiata" @default.
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- W2973064592 doi "https://doi.org/10.1016/j.aquaculture.2019.734512" @default.
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