Effective use of glucose rather than starch in formulated semimoist diets of common octopus (Octopus vulgaris)

Abstract

The aim of the present work was to test the capacity of Octopus vulgaris to use carbohydrates supplied in three diets: a diet without added carbohydrates (diet C0: 500 g kg À1 water, 200 g kg À1 gelatine, 100 g kg À1 egg yolk powder, 50 g kg À1 freeze-dried Sardinella aurita and 150 g kg À1 freeze-dried Todarodes sagittatus) and two obtained by substituting 50 g kg À1 of T. sagittatus by glucose (diet GLU50) or by starch (diet STA50). The most stable and best-accepted diet was STA50 (SFR 1.26%BW day À1 ) although there were no significant differences in the growth rates obtained with the three diets: 10.12 g day À1 , 9.37 g day À1 and 11.22 g day À1 for C0, GLU50 and STA50, respectively (P > 0.05). The feed efficiency indices were better for GLU50, of particular note being the protein productive value of 71.88% and a feed conversion ratio lower than 1. Protein and lipid digestibility were similar in all the three diets (96-98% for proteins and 85-94% for lipids), whereas carbohydrate digestibility was higher in GLU50 (98%) than in C0 (84%) and STA50 (0.33%). The content of carbohydrates increased in muscle and the digestive gland as a consequence of the increased carbohydrates intake.

Performance of raw material thermal treatment on formulated feeds for common octopus (Octopus vulgaris) ongrowing

“…In this sense, an enhancement on CH digestibility was reported for O. vulgaris by Morillo-Velarde et al (2014a) when glucose was added to prepared feeds (97.56%, compared to 83.91% in those where CH were not added), as previously reported by O'Dor et al (1984) to be 98%. In contrast, CH digestibility was practically null when only starch was included (Morillo-Velarde et al, 2014a).…”

High feeding and growth rates in common octopus (Octopus vulgaris ) fed formulated feeds with an improved amino acid profile and mixture of binders

“…In this species, recent results supplying formulated feeds have been satisfactory compared with natural fish‐based diets (Estefanell et al . ; Morillo‐Velarde, Cerezo Valverde, Aguado‐Giménez, Hernández & García García ), although the excellent results obtained with a mixed crustacean‐fish‐based diet have still not been emulated supplying formulated feeds based on dry raw materials. Currently, research has focus on the development production of semi‐moist or extruded diets from dry ingredients (Martínez, Gallardo, Pascual, Navarro, Sánchez, Caamal‐Monsreal & Rosas ; Morillo‐Velarde et al .…”

“…Currently, research has focus on the development production of semi‐moist or extruded diets from dry ingredients (Martínez, Gallardo, Pascual, Navarro, Sánchez, Caamal‐Monsreal & Rosas ; Morillo‐Velarde et al . ; Querol, Gairín, Guerao, Jover & Tomás ; Querol, Gairín, Guerao, Monge, Jover & Tomás ; Rodríguez‐González, Cerezo Valverde, Sykes & García García ) for their best conservation, stability and lower environmental impact compared with natural diets (Mazón, Piedecausa, Hernández & García García ).…”

“…() and Morillo‐Velarde et al . , but also an increase in feed disintegration rates so new binders should be used to reduce this effect. (3) Improve the texture to make it more similar to fish or crustacean flesh to help feed manipulation by octopuses.…”

Replacing live feed with formulated diets in juvenile Patagonian red octopus (Enteroctopus megalocyathus)

“…Feeds based on natural diets (e.g., crustaceans, fish and molluscs), moist diets (blended natural prey pastes) and formulated diets (agglutinated mixtures of wet and/or dry ingredients with different additives) for ongrowing octopus have been documented for the common octopus Octopus vulgaris (Aguado‐Giménez & García, ; Biandolino, Portacci, & Prato, ; Cerezo, Hernández, Aguado‐Giménez, & García, ; Domingues, García, Hachero‐Cruzado, Lopez, & Rosas, ; Estefanell, Socorro, Izquierdo, & Roo, ; Estefanell, Socorro, Tuya, Izquierdo, & Roo, ; Estefanell et al., ; García et al., ; Morillo‐Velarde, ; Morillo‐Velarde, Cerezo, Aguado‐Giménez, Hernández, & García García, ; Rodríguez‐González, Cerezo, Sykes, & García, ; Sánchez, Valverde, & García García, ), the Yucatan octopus Octopus maya (Rosas et al., , ; Aguilar, Novoa, Morales, & Vásquez, ; Martínez et al, ), the Chango octopus Octopus mimus (Zúñiga, Olivares, & Torres, ) and for E. megalocyathus (Farías et al., ; Gutiérrez, Uriarte, Yany, & Farías, ; Pérez, López, Aguila, & González, ). The best growth rates in juvenile stages have been reported in O. maya (Martínez et al., ) using a moist crustacean‐based diet (3.04 %/day), followed by O. vulgaris (Biandolino et al., ), and E. megalocyathus (Pérez et al., ) with both being fed a natural diet (1.93 %/day and 1.36 %/day, respectively), and finally O. mimus (Zúñiga et al., ) with a moist agglutinated diet (0.7%/day).…”