NDLI: Effects of two dietary protein levels on energy balance and digestive capacity of Octopus maya

Content Provider	Springer Nature Link
Author	Rosas, Carlos Sánchez, Ariadna Pascual, Cristina Aguila, Josué Maldonado, Teresita Domingues, Pedro
Copyright Year	2010
Abstract	Octopus maya is a carnivorous species and protein is the main energy source. During the present study, two different dietary protein levels (40 and 60% CP) were offered to octopuses as specifically designed artificial diets, to determine protein needs and the effects on metabolism. Frozen crab (Callinectes spp.) was used as control. Results obtained demonstrated that crab remains as one of the best diets for O. maya. The artificial diet with 60% CP produced a low but positive growth rate, and at times, a physiological response similar to that observed in octopuses fed crabs. The present results show the capacity of O. maya juveniles to adjust their digestive enzymes to different types of food and protein level, and this appears to be well correlated with octopus growth. General proteases and trypsin from the pancreas were well correlated with growth rates. A low activity was observed in octopuses fed 40% PC diet (negative growth rate), while a high activity was present in octopuses fed 60% CP diet and crabs (low and high growth rate, respectively). In contrast, these same enzymes were inducted in the salivary glands of octopuses fed with the diet that promoted weight loss (40% CP diet), while a reduced activity was observed in octopuses fed crabs. Energy budget indicates that the animals ingested more than 1,000 kJ week−1 kg−1; with such energy, octopuses should satisfy their physiological demands such as was observed when animals were fed crab (I = 1,300 kJ week−1 kg−1; P = 834 kJ week−1 kg−1). However, a very low digested energy was observed in octopuses the fed artificial diets, indicating that these could have a factor that limits digestibility.
Starting Page	165
Ending Page	180
Page Count	16
File Format	PDF
ISSN	09676120
Journal	Aquaculture International
Volume Number	19
Issue Number	1
e-ISSN	1573143X
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-05-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Energy balance Enzymes Lipids Metabolism Octopus maya Protein Zoology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Agronomy and Crop Science

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