Effect of the squid viscera hydrolysate on growth performance and digestion in the red sea bream Pagrus major

• Published in: Fish physiology and biochemistry Vol. 43; no. 6; pp. 1543 - 1555
• Main Authors: Kondo, Fumitaka, Ohta, Takashi, Iwai, Toshiharu, Ido, Atsushi, Miura, Chiemi, Miura, Takeshi
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2017; Springer Nature B.V
• Subjects: Animal Anatomy; Animal Biochemistry; Animal Feed - analysis; Animal Nutritional Physiological Phenomena; Animal Physiology; Animals; Appetite; Aquaculture; Biomedical and Life Sciences; Body weight; Brain; carboxylic ester hydrolases; cecum; Cloning, Molecular; Decapodiformes - chemistry; diet; Diet - veterinary; Digestion; Digestion - drug effects; Efficiency; Feed conversion; Feed conversion efficiency; Feed efficiency; feed intake; Feeding; Feeds; Fish; Fish culture; Food conversion; Fork length; Freshwater & Marine Ecology; Gene expression; Gene Expression Regulation; Ghrelin; growth performance; Histology; hydrolysates; Life Sciences; Lipase; Marine molluscs; messenger RNA; Mineral nutrients; Morphology; Neuropeptide Y; Nutrient availability; Pagrus major; Pepsin; Perciformes - growth & development; Perciformes - physiology; Physical growth; Pyloric caeca; Squid; Stomach; Trypsin; Viscera; Zoology; Squid viscera hydrolysate; Gut-brain hormones; Growth performance; Aquaculture; Digestive enzyme
• ISSN: 0920-1742; 1573-5168; 1573-5168
• DOI: 10.1007/s10695-017-0391-y

The improvement in feed efficiency is one of the most important subjects in fish culture. The development of feed, in terms of good intake, high growth performance, and high feed efficiency is needed. Squid viscera are one of the candidates for alternative material in improving feed efficiency in fish culture. In the present study, we described the dietary effect of the squid viscera hydrolysate (SVH) on the growth performance of the red sea bream. The addition of SVH to feed caused significant increases in feed intake, fork length, and body weight and produced a marked improvement in feed conversion after 4 weeks of feeding. Furthermore, the results of this feeding revealed that low dietary levels of SVH promote growth performance in the red sea bream. We physiologically analyzed digestion and appetite in fish fed diet containing SVH. SVH promoted the activity of hepatic trypsin and lipase, gene expression of stomach pepsin, hepatic lipase, and pyloric caeca trypsin, thereby improving the nutrient availability in red sea bream. Moreover, the mRNA expression of appetite regulating factor, such as brain NPY and stomach ghrelin was significantly improved by dietary SVH. Our current results indicate that dietary SVH as alternative material produced excellent effects on growth performance, which is dependent on the promoting effect on digestion and appetite in red sea bream.