Evaluation of physiological stress and nutritional deficiency related to cannibalism in early paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Espinoza, Viviana; Brokordt, Katherina; Romero, Alex; Farı́as, Ana; Uriarte, Íker

doi:10.1016/j.aquaculture.2018.12.087

Cited by 9 publications

(3 citation statements)

References 24 publications

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“…However, this density shows a non‐significant trend to the highest cannibalism values at any prey availability, so it is or is very close to being a critical density. Espinoza et al, (2019), showed that cultured paralarvae grown at such high density were physiologically stressed when they had low availability of preys, which promoted cannibalism. Therefore, prey availabilities greater than 5 preys paralarvae −1 day −1 are appropriate for rearing high paralarval densities reducing stressing them.…”

Section: Discussionmentioning

confidence: 99%

Assessment of culture density and prey availability for the management of cannibalism in paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Espinoza

Brokordt

Farı́as

et al. 2021

Aquaculture Research

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The Patagonian red octopus Enteroctopus megalocyathus (Gould, 1852) is a merobenthic cephalopod that inhabits the coasts of Chile from the Los Lagos region (41°lat. S) to the Strait of Magellan (56º lat. S) in the South Eastern Pacific (Ibáñez et al., 2009); it can also be found in the coasts of Argentina from the Gulf of San Matías (41ºlat. S), to the Strait of Magellan (56º lat.S) in the South Atlantic (Ré, 1998). It is one of the two octopus species of commercial importance in Chile, being exploited by artisanal fishing. Recently, the life cycle of E. megalocyathus under captivity has been completed, and its culture was possible until commercial size (Farías et al., 2016;. The culture of this species shown its high growth rate, reaching commercial size in 2.5 years after hatching with a weight of 2.5 to 3 kg (Uriarte et al., 2019). The paralarval stage lasts between 90 to 114 days , after an embryonic development of 135 to 172 days, depending on the temperature

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Section: Discussionmentioning

confidence: 99%

Assessment of culture density and prey availability for the management of cannibalism in paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Espinoza

Brokordt

Farı́as

et al. 2021

Aquaculture Research

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“…used in this study has a rich EPA content of 1.6–3.8%, but lacks DHA (Sukenik, Zmora, & Carmeli, 1993), and enhances the free protein and amino acid level but does not improve essential fatty acid deficiency of this species (Aragao, Conceiçao, Dinis, & Fyhn, 2004), while enrichment with emulsions with essential fatty acids and Nannochloropsis leads to better results both in O. vulgaris (Fuentes et al, 2011) and in E. megalocyathus (Farías et al, 2016); however, improvement of the quality of the prey/diet is still required because it is recognized that artemia is not a balanced food for octopus paralarvae (Uriarte et al, 2019). On the other hand, the idea that competition between paralarvae for suboptimal food is an activity that demands more nutrients or energy, which are not available and therefore increases mortality, has also been suggested (Espinoza, Brokordt, Romero, Farías, & Uriarte, 2019).…”

Section: Discussionmentioning

confidence: 99%

Characterization of cannibalism in early paralarvae of Patagonian red octopus, Enteroctopus megalocyathus (Gould, 1852), grown in a controlled environment

Espinoza

Farı́as

Uriarte

2020

J World Aquaculture Soc

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In the experimental mariculture of Patagonian red octopus, Enteroctopus megalocyathus, paralarvae rearing showed the highest mortalities. Part of this mortality has been attributed to cannibalism, so we studied the joint effect of paralarvae density and prey availability upon cannibalism in the first 2 weeks after hatching. Three culture densities (1, 5, and 10 paralarvae/L) and three prey availabilities (0, 5, and 10 prey day −1 paralarvae −1) were tested. Two experiments were carried out in early paralarvae: one experiment where the prey consisted of artemia 5 mm in size (Experiment 1) and other experiment where the artemia size was 1 mm (Experiment 2). Results showed, in both experiments, that survival and cannibalism during the first 2 weeks after hatching were independent of the paralarvae density and the prey availability. In experiment 1, with artemia 5 mm in size, the mortality attributed to cannibalism decreased when the prey availability was increased, nor was there any effect Viviana Espinoza, Ana Farías, and Iker Uriarte belong to Interdisciplinary Network of Advanced Research for Marine Larviculture of Species with Complex Lifecycles (www.inlarvi.cl).

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“…On two occasions, A. fangsiao juveniles that hatched overnight and remained in the same system until the morning were observed to cannibalize unhatched late Naef stage embryos, resulting in their death shortly after. Cannibalism in the early hatchling stage, including sibling cannibalism, was previously described for paralarvae from Robsonella fontaniana (Miranda et al, 2011) and E. megalocyathus (Espinoza et al, 2019(Espinoza et al, , 2021 and was primarily attributed to overcrowding and food availability. While this behavior does not explain the early decline in embryonic survival and the severity on later Naef stage embryos cannot entirely be assessed, this behavior should be considered in artificial rearing unit designs, i.e., having an overflowing system that removes newly hatched juveniles from unhatched embryos.…”

Section: Embryonic Survivalmentioning

confidence: 91%

The effectiveness and impact of disinfection with chlorine on embryos and early hatchlings of two Western Pacific octopus species

Spreitzenbarth,

Ureshino,

Soma

et al. 2024

J World Aquaculture Soc

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Replicating maternal care and incubating octopus embryos artificially is advantageous to improve access to embryonic stages, split and share broods, and reduce the required space to culture large quantities of embryos. However, without female care and adequate rearing systems, the risk of bacterial and fungal infections can be high. This study evaluated the potential effects of low‐concentration sodium hypochlorite (NaOCl) as a disinfectant on embryonic survival, hatchling survival, and growth. Embryos of a holobenthic octopus, Amphioctopus fangsiao, and of a merobenthic octopus, Octopus sinensis, were disinfected with 0.004% NaOCl for 3 min either once at the start (IB), at the start and halfway point (RB), and without disinfection (control). Survival of A. fangsiao embryos differed among treatments initially, but the final number of hatchings did not differ among treatments. No differences in the final survival for O. sinensis embryos were observed among the three treatments. Wet weight and growth for A. fangsiao juveniles did not differ among treatments at any point. In contrast, initial and final dry weight for O. sinensis paralarvae from the control treatment were heavier compared to the IB and RB treatments. These results suggest that NaOCl used as disinfectant has a species‐specific effect on early hatchlings depending on the octopus life history.

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Evaluation of physiological stress and nutritional deficiency related to cannibalism in early paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Cited by 9 publications

References 24 publications

Assessment of culture density and prey availability for the management of cannibalism in paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Assessment of culture density and prey availability for the management of cannibalism in paralarvae of Patagonian red octopus Enteroctopus megalocyathus

Characterization of cannibalism in early paralarvae of Patagonian red octopus, Enteroctopus megalocyathus (Gould, 1852), grown in a controlled environment

The effectiveness and impact of disinfection with chlorine on embryos and early hatchlings of two Western Pacific octopus species

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