Octopus Senescence: The Beginning of the End

Anderson, R. C.; Wood, James B.; Byrne, Ruth A.

doi:10.1207/s15327604jaws0504_02

Cited by 90 publications

(102 citation statements)

References 13 publications

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“…3). Senescence at the end of a cephalopod's lifecycle (Anderson et al 2002) as a consequence leads to lower energy intake of an individual and the here proposed sigmoid-like function. The cannibalism observed during this period is assumed to be primarily sexual (post-copulation) and in case of the octopuses additionally filial.…”

Section: Inter-cohort Cannibalismmentioning

confidence: 70%

Cannibalism in cephalopods

Ibáñez

Keyl

2009

Rev Fish Biol Fisheries

132

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Cannibalism refers to the action of consuming a member of the same species and is common in many taxa. This paper reviews the available literature on cannibalism in cephalopods. All species of the class Cephalopoda are predators and cannibalism is common in most species whose diet has been studied. Cannibalism in cephalopods is densitydependent due to their aggressive predatory and in case of the octopuses territorial nature. It also depends upon local and temporal food availability and of the reproductive season. Cannibalistic behaviour is positively related to the size of both cannibal and victim. It can affect population dynamics of cephalopods in periods of low food availability and/or high population abundance. Cephalopods are generally restricted in their ability to store energy. It is thus assumed that cannibalism is part of a population energy storage strategy enabling cephalopod populations to react to favourable and adverse environmental conditions by increasing and reducing their number. Finally, we propose five orientation points for future research on cannibalism in cephalopods.CM Ibáñez was supported by a CONICYT doctoral fellowship

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Section: Inter-cohort Cannibalismmentioning

confidence: 70%

Cannibalism in cephalopods

Ibáñez

Keyl

2009

Rev Fish Biol Fisheries

132

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“…4,11 The size and interactive nature of the giant Pacific octopus (Enteroctopus dofleini), make it a popular exhibit species in aquaria. 1,11 However, there are challenges in maintaining cephalopods in captivity, including their semelparous reproductive life history and sensitivity to environmental changes. 11 The giant Pacific octopus lacks an acquired immune system and the innate immune system can be overwhelmed by poor water quality, increased bacterial loads, and other environmental stressors.…”

Section: Brief Communicationmentioning

confidence: 99%

RETROSPECTIVE REVIEW OF MORTALITY IN GIANT PACIFIC OCTOPUS (ENTEROCTOPUS DOFLEINI)

Seeley¹,

Clayton²,

Hadfield³

et al. 2016

Journal of Zoo and Wildlife Medicine

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The giant Pacific octopus (Enteroctopus dofleini) is a popular exhibit species in public display aquaria, but information on health and disease is limited. This retrospective review evaluates time in collection and describes antemortem clinical signs and pathology of giant Pacific octopuses in an aquarium setting. Between March 2004 and December 2013, there were 19 mortalities: eight males, 10 females, and one individual whose sex was not recorded. Average time spent in collection for all octopuses was 375 ± 173 days (males 351 ± 148 days, females 410 ± 196 days). Ten (52.6%) of the octopuses were sexually mature at the time of death, six (31.6%) were not sexually mature, and reproductive status could not be determined in three octopuses (15.8%). Minimal changes were noted on gross necropsy but branchitis was histologically evident in 14 octopuses, often in conjunction with amoeboid or flagellate parasites. Senescence, parasitism, and husbandry were all important contributors to mortality and should be considered when caring for captive octopuses.

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“…While disease does not cause senescence, disease is often associated with senescence (Anderson et al 2002). Given the short life span of cephalopods a persistent question is how we identify and separate natural processes that result in senescence from health problems associated with captive conditions and handling.…”

Section: Concluding Thoughtsmentioning

confidence: 99%

Ethical and welfare considerations when using cephalopods as experimental animals

Moltschaniwskyj

Hall

Lipiński

et al. 2007

Rev Fish Biol Fisheries

128

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When using cephalopods as experimental animals, a number of factors, including morality, quality of information derived from experiments, and public perception, drives the motivation to consider welfare issues. Refinement of methods and techniques is a major step in ensuring protection of cephalopod welfare in both laboratory and field studies. To this end, existing literature that provides details of methods used in the collection, handling, maintenance, and culture of a range of cephalopods is a useful starting point when refining and justifying decisions about animal welfare. This review collates recent literature in which authors have used cephalopods as experimental animals, revealing the extent of use and diversity of cephalopod species and techniques. It also highlights several major issues when considering cephalopod welfare; how little is known about disease in cephalopods and its relationship to senescence and also how to define objective endpoints when animals are stressed or dying as a result of the experiment.

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Octopus Senescence: The Beginning of the End

Cited by 90 publications

References 13 publications

Cannibalism in cephalopods

Cannibalism in cephalopods

RETROSPECTIVE REVIEW OF MORTALITY IN GIANT PACIFIC OCTOPUS (ENTEROCTOPUS DOFLEINI)

Ethical and welfare considerations when using cephalopods as experimental animals

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