Feeding intensity and molecular prey identification of the common long-armed octopus, Octopus minor (Mollusca: Octopodidae) in the wild

Bo, Qi-Kang; Zheng, Xiaodong; Chen, Zhiwei

doi:10.1371/journal.pone.0220482

Cited by 12 publications

(6 citation statements)

References 33 publications

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“…A similar situation has been reported for immature O. mimus in China that experiences high feeding intensity in April and June (Bo et al, 2020). This is probably because each octopus species experiences different feeding patterns depending on the period of availability and prey abundance in a particular geographical location.…”

Section: Discussionsupporting

confidence: 79%

“…For example, Quetglas et al (2005) observed a high incidence of empty stomachs in ripe O. salutii, while Bo et al (2020) noticed the presence of more than half of adult O. minor females with empty stomachs.…”

Section: Discussionmentioning

confidence: 99%

“…The feeding modification with maturity stages aims to accommodate the physiological requirements of octopuses (Bo et al, 2020). For example, during the spawning stage, octopuses stop feeding while focusing exclusively on laying and caring for eggs (Anderson et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…2) than males, so they need an extended time to allocate resources needed to produce offspring, and in doing so, they double their physiological processes faster than males (Archer et al, 2022). Due to this, their food is digested more quickly than that of males (Omedes et al, 2022), and they invest it in the development of the vitellus (Bo et al, 2020). This may explain why more unidentified food remains was found in females than in males in this study, showing that their rapid digestion rates have an immediate impact on the prey they eat.…”

Section: Discussionmentioning

confidence: 99%

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Feeding habits and diet composition of Octopus cyanea (Gray, 1849) in Zanzibar waters, Tanzania

Hamad,

A. Muhando

2023

WIO J. Mar. Sci.

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The octopus fishery in Zanzibar is an essential activity of coastal communities. To assist with developing fisheries management plans, baseline information on the feeding of Octopus cyanea (Gray, 1849) was collected in relation to sex and maturity stages. The feeding habits and diet composition of 543 O. cyanea were studied over a period of 12 months at Paje, Kizimkazi, Chwaka Bay and Nungwi. Samples at each site were collected on two days per month during spring tide. Digestive tract contents revealed that O. cyanea preyed on 36 species of crustaceans, molluscs and fishes, with crabs a major prey item. The number of prey species in a single stomach ranged from one to six. O. cyanea in Zanzibar is therefore a generalist predator with a mixed diet. The octopus gonadosomatic index (GSI) indicated a peak breeding season in June to October, which correlated with low prey consumption. Mature octopuses ingested a small amount of food from mainly small sessile prey. Females consumed less food than males of similar maturity stages, suggesting that they ate less or had higher digestion rates. The information is useful for developing fisheries management plans for the octopus fishery in Zanzibar.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Feeding habits and diet composition of Octopus cyanea (Gray, 1849) in Zanzibar waters, Tanzania

Hamad,

A. Muhando

2023

WIO J. Mar. Sci.

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“…Stomach contents exhibit prey compositions that differ markedly from midden counts for shelled mollusks and soft-bodied organisms, and flaws in prey identification have been identified for both methods (Smith, 2003). Rapid digestion and external ingestion can make the stomach contents visually unidentifiable (e.g., Bo et al, 2019). Midden contents left around dens after the GPO processes prey are often highly fragmented, making accurate identification difficult (Boyle and Rodhouse, 2005).…”

Section: Introductionmentioning

confidence: 99%

Food Web Trophic Structure at Marine Ranch Sites off the East Coast of Korea

et al. 2021

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Understanding the trophic ecology of the giant Pacific octopus Enteroctopus dofleini is challenging in developing marine ranches and in reestablishing its regional stocks against the severe stress of fishing. We adopted carbon and nitrogen stable isotope techniques (termed δ13C and δ15N, respectively) to identify the trophic niche (i.e., pathways and positions) of this species systematically in the entire food webs of two marine ranches off the east coast of the Korean peninsula. While a slight spatial shift in the isotopic nestedness of faunal communities was observed, the δ13C and δ15N values of consumers were distinct and separate among functional groups at both ranches. The consumer δ13C values spanned a broad range between pelagic and benthic sources of organic matter, and their δ15N values recorded a stepwise trophic-level enrichment, indicating that suspension feeders and herbivore-deposit feeders served as baselines of pelagic- and benthic-based trophic pathways, respectively. The δ13C values of predators, including E. dofleini, were arrayed between the two primary consumer groups. Neither δ13C nor δ15N values showed any remarkable variations with increasing octopus weight. Dietary mixing-model calculations indicated that E. dofleini is a generalist predator relying on both benthic- and pelagic-affinity prey, similar to some teleost species that consume a diverse spectrum of prey. In contrast, other teleost groups showed prevalent trophic links with either pelagic- or benthic-based pathways. The trophic-level estimations revealed that E. dofleini occupies an intermediate position slightly below the teleosts. A lack of discrete trophic positions between E. dofleini and teleosts seemed to be indicative of the released teleost predation but instead reflects the imposed food competition. Overall, the results demonstrated that despite compositional changes in the taxa constituting individual trophic groups, E. dofleini occupied a very similar trophic niche in both ranching systems. Finally, as extracted from information based on octopus marine ranches launched on natural rocky bottoms, our isotopic evidence provides a greater understanding of the trophic ecology of this octopus species in nearshore natural habitats along the southwestern margin of its distribution range.

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Food to go: prey on the web of Octopus maya reveals its diet

Markaida

2023

Mar Biol

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Feeding intensity and molecular prey identification of the common long-armed octopus, Octopus minor (Mollusca: Octopodidae) in the wild

Abstract: The common long-armed octopus, Octopus minor

Cited by 12 publications

References 33 publications

Feeding habits and diet composition of Octopus cyanea (Gray, 1849) in Zanzibar waters, Tanzania

Feeding habits and diet composition of Octopus cyanea (Gray, 1849) in Zanzibar waters, Tanzania

Food Web Trophic Structure at Marine Ranch Sites off the East Coast of Korea

Food to go: prey on the web of Octopus maya reveals its diet

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