Relationship between nutritional and rearing parameters of Octopus maya juveniles fed with different rations of crab paste

Abstract

To study the effect of feed ration on rearing and nutritional conditions of Octopus maya juveniles (7–10 days old), two groups of octopuses were fed on 10% and 30% rations, using a crab paste agglutinated with gelatine, when compared to another control group fed ad libitum on crab muscle tissue. The agglutinated diet was well accepted by the octopuses at this early stage. When considered together, the marginally higher survival of the 30% group and probably higher levels of the other rearing performance parameters (growth and feeding rate) indicate that this feed ration is more adequate than a 10% feed ration for rearing O. maya under these conditions. Octopuses fed 30% also generally showed higher total energy per gram of arm tissue and oxygen consumption, as well as different proteolytic activity. In addition, the mentioned nutritional differences influenced by the feed ration were found to be statistically correlated to the promoted growth and the end survival and feeding rates.

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

“…All post‐hatching octopuses were fed twice a day at 9:00 and 16:00 hours (at a ratio of 30% wet body weight ‘wBW’) with semi‐moist crab paste (native protein 95%) mixed with natural pre‐heated (70°C) gelatin as agglutinant (5%). Paste was placed on empty clam shells (Quintana, Rosas & Moreno‐Villegas ).…”

“…Semi humid paste was prepared once a week, and placed on empty clam shells (Quintana et al . ) and preserved at 4°C until use. Growth and survival rates were calculated as in experiment 2.…”

Cytological ontogeny of the digestive gland in post-hatching Octopus maya, and cytological background of digestion in juveniles

“…All octopuses were fed twice a day at 09:00 and 16:00 h (at a ration of 30% g wet body weight [wBW]) with semimoist crab paste (95%) mixed with natural gelatin as an agglutinant (5%) and placed on empty clam shells (Rosas et al 2008, Quintana et al 2010.…”

Effect of maternal temperature stress before spawning over the energetic balance of Octopus maya juveniles exposed to a gradual temperature change

“…Afterwards, octopuses were fed, providing half of the ration (15% ww day − 1 ) two times a day, to complete a total ration of 30% ww day −1 (Quintana et al, 2011). Oxygen consumption measurements during the feeding phase were taken every minute until the oxygen consumption returned to pre-feeding values.…”