Growth, partial energy balance, mantle and digestive gland lipid composition of Octopus vulgaris (Cuvier, 1797) fed with two artificial diets

Abstract

Effects of two binders (gelatine and alginate) were tested on growth, survival, partial energy balance and lipid composition of mantle and digestive gland (DG) of Octopus vulgaris. The three diets tested were given as follows: CON, (Loligo gahi) as control, GEL, composed of squid paste (L. gahi) (300 g kg−1), fish hydrolyse CPSP® (100 g kg−1) and fish meal (500 g kg−1), agglutinated with 100 g kg−1 of gelatine and ALG, composed of squid paste (L. gahi) (300 g kg−1), fish hydrolyse CPSP® (100 g kg−1) and fish meal (500 g kg−1), all agglutinated with 100 g kg−1 of alginate. Growth rates were 13.7 ± 2.1, 2.1 ± 2.8 and −2.4 ± 2.9 g kg−1 bw day−1, for octopuses fed CON, GEL and ALG diets, respectively. DGs of octopuses had higher concentrations of fatty acids (FA) than the mantle. DG of animals fed CON had higher concentrations of FAs than those fed the artificial diets. Energetic balance demonstrated that physiologically useful energy for maintenance E(B) was affected by type of diet, with negative values of E(B) in animals fed ALG and positive (85 and 154 kJ kg−1 day−1) in octopuses fed GEL and CON, respectively. The ALG diet did not cope with the physiological requirements for octopus growth.

Lipid composition of the mantle and digestive gland of Octopus vulgaris juveniles (Cuvier, 1797) exposed to prolonged starvation

“…There is evidence that this organ is used for short-term lipid storage (Boucher-Rodoni et al 1987;Fluckiger et al 2008), and it is considered to be a good indicator of nutritional status ). Furthermore, the importance of lipids in cephalopod metabolism has been demonstrated, both in early stages of development Villanueva 2000, 2003;Villanueva et al 2002) or juveniles and adults (Domingues et al 2003;Almansa et al 2006;Ferreira et al 2009;García et al 2009). …”

Diet Composition and Variability of Wild Octopus vulgaris and Alloteuthis media (Cephalopoda) Paralarvae: a Metagenomic Approach

“…Juvenile and sub-adult cephalopods are mainly fed with live prey, including crustaceans, fishes, and mollusks (Domingues et al, 2004; García García and Cerezo Valverde, 2006; Sykes et al, 2013), fisheries discards (Socorro et al, 2005; Estefanell et al, 2011), frozen prey (Ferreira et al, 2010; Sykes et al, 2013), or artificial feed stuffs (Garcia et al, 2011; Estefanell et al, 2013). Paralarvae in captivity have been traditionally fed with enriched Artemia (Iglesias et al, 2006) or supplemented with decapod zoeae, copepods, mysids, shrimps, or fish larvae, which increases survival and growth rates (Hernández-García et al, 2000; Iglesias et al, 2004, 2006; Ikeda et al, 2005; Carrasco et al, 2006; Kurihara et al, 2006; Martínez et al, 2014; Farías et al, 2015).…”

Effects of dietary protein sources on growth, survival and digestive capacity ofOctopus mayajuveniles (Mollusca: Cephalopoda)

“…; García et al . ; Rosas, Sanchez, Pascual, Aguila y Elvira, Maldonado & Domingues ). Recent results demonstrated that protein requirement for O. maya could be of around 60%, which is the average protein content commonly found in squid meal (Rosas et al .…”