NDLI: Metabolic responses to dietary protein/carbohydrate ratios in zebra sea bream (Diplodus cervinus, Lowe, 1838) juveniles

Content Provider	Springer Nature Link
Author	Coutinho, Filipe Peres, Helena Castro, Carolina Pérez Jiménez, Amalia Pousão Ferreira, Pedro Oliva Teles, Aires Enes, Paula
Copyright Year	2015
Abstract	This study aims to evaluate the effect of diets with different protein to carbohydrate ratios (P:C) on the omnivorous zebra sea bream (Diplodus cervinus) juveniles growth performance, feed efficiency, N excretion and metabolic response of intermediary metabolism enzymes. Four isoenergetic and isolipidic diets were formulated to contain increasing protein levels (25, 35, 45 and 55 %) at the expense of carbohydrates (43, 32, 21 and 9 %): diets P25C43, P35C32, P45C21 and P55C9. Growth performance, feed efficiency (FE), N intake [(g kg−1 average body weight (ABW) day−1)], N retention (g kg−1 ABW day−1) and energy retention (kJ kg−1 ABW day−1) increased with the increase of P:C ratio. The best growth performance and FE were achieved with diet P45C21. Ammonia excretion (mg NH4–N kg−1 ABW day−1) increased as dietary protein level increased. Alanine aminotransferase and glutamate dehydrogenase activities increased with the increase of dietary P:C ratio. The opposite was observed for malic enzyme activity. Aspartate aminotransferase, hexokinase, glucokinase, fructose-1, 6-bisphosphatase and fatty acid synthetase activities were unaffected by dietary treatments. Response of key amino acid catabolic enzymes and N excretion levels to dietary P:C ratio supports the metabolic adaptability of this species to dietary protein inclusion levels. Overall, zebra sea bream seems capable of better utilize dietary protein rather than dietary carbohydrates as energy source which may be an obstacle for using more economically diets and thus for reducing environmental N loads in semi-intensive aquaculture of this species.
Starting Page	343
Ending Page	352
Page Count	10
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	42
Issue Number	1
e-ISSN	15735168
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-10-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbohydrate Diplodus cervinus Enzyme activity Intermediary metabolism N excretion Protein Freshwater & Marine Ecology Animal Physiology Animal Anatomy / Morphology / Histology Animal Biochemistry Zoology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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