Male reproductive maturity in the octopus,<i>Eledone cirrhosa</i>(Cephalopoda: Octopoda)

Boyle, P. R.; Knobloch, Daniela

doi:10.1017/s0025315400030265

Cited by 15 publications

(7 citation statements)

References 12 publications

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“…Several male reproductive studies in different species of octopus agree that male mature faster than females (Boyle & Knobloch;Silva et al, 2004;Rodríguez-Rua et al;Akyol et al, 2007;Leporati et al), which is consistent with the observations of this study, where the smallest mature male was 6.7 g, and the smallest mature female 22.8 g.…”

Section: Discussionsupporting

confidence: 92%

“…The distinctive and peculiarity in the oogenesis of these species, is the formation of a second layer of follicular cells and the follicular invagination, which generate the yolk secretion (Boyle & Knobloch). Although there is much discrepancy in the number of stages established and nomenclature assigned, most studies agree on a stage for the secondary follicle formation, and subsequently the formation of the chorion (Boyle & Knobloch;Arkhipkin;Gabr et al, 1998;Olivares-Paz et al;Rodriguez-Rua et al;Boyle & Rodhouse;Jiménez-Badillo et al).…”

Section: Discussionmentioning

confidence: 99%

“…Boyle & Knobloch (1984) and Moriyasu (1988) recognized in E. cirrhosa a scale with three stages for females and males.…”

Section: Introductionmentioning

confidence: 99%

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Histological Analysis of the Reproductive System and Gonad Maturity of Octopus rubescens

et al. 2013

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Histological Analysis of the Reproductive System and Gonad Maturity of Octopus rubescens

et al. 2013

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“…Males appear to mature earlier, coinciding with the shift between growth phases, whereas females tend to mature in the second slower phase of growth (Semmens et al 2004). Assessing reproductive investment has been achieved for a few species (Boyle & Knobloch 1984, Perez & Haimovici 1991, Cortez et al 1995 but estimating the onset of sexual maturation remains problematic, as the influence of food availability and temperature on this aspect of reproduction has yet to be quantified. Given the deficiency in information, we did not incorporate reproductive growth to avoid introducing unsupportable complexity into the model.…”

Section: Conceptmentioning

confidence: 99%

Effects of temperature on energetics and the growth pattern of benthic octopuses

André

Grist²,

Semmens³

et al. 2009

Mar. Ecol. Prog. Ser.

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In octopus, growth trajectories have implications for survivorship, adult size and fecundity. Many species exhibit a 2-phase growth pattern starting with rapid exponential growth before shifting to a slower (commonly power) growth rate. Based on the concept that energy conservation enforces this threshold, we developed a temperature-dependent model which incorporates the energy balance between food intake and expenditure in growth and metabolism. We employed the model to investigate growth patterns occurring at different temperatures for 2 octopus species, Octopus ocellatus and O. pallidus. Model projections were consistent with laboratory data and suggest that increases in temperature as small as 1°C could have a significant influence on cephalopod growth, affecting the threshold body mass by up to 15.5% and the body mass at 100 d by up to 62.6%. Sensitivity analyses suggest that threshold size is more sensitive than threshold age to any given change in parameter values, and that metabolic rate has the greatest influence on the growth threshold. This model provides a basis for predicting individual growth trajectories and consequential population structure of natural octopus populations. This type of analysis also has the potential to predict optimum conditions for a species and could be a powerful tool for predicting how climate change might affect species distribution as well as population structure and abundance.KEY WORDS: Energy balance · 2-phase growth · Gold-spot octopus · Pale octopus · Climate change Resale or republication not permitted without written consent of the publisher

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“…In the course of recent studies on the growth and reproduction of Eledone cirrhosa from the North Sea (Boyle & Knobloch, 1982,1983,1984 animals which had remained in aquarium conditions for 5 days or over were separated from the analysis. We now compare the state of sexual maturity of these aquarium animals with that found in animals fresh from the sea.…”

Section: Introductionmentioning

confidence: 99%

Reproductive maturity in fresh and aquarium-heldEledone cirrhosa(Cephalopoda: Octopoda)

Boyle¹,

Knobloch²

1984

J. Mar. Biol. Ass.

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Female Eledone cirrhosa held in aquarium conditions for periods of time of five daysand over show relatively enlarged ovary sizes. Values for ovary index considerably exceed thoseof freshly caught animals and the incidence of the final stage of maturity, in which eggs pack the oviducts, is greater. A comparison of maturity indices for fresh and aquarium males was inconclusive. The range of factors associated with aquarium conditions is briefly reviewed and it is concluded that studies of cephalopod reproductive maturation must distinguish fresh and aquarium animals.IntroductionExternal factors effective in inducing sexual maturation in cephalopods have been suggested several times. The influence of the absence of light has been implicated since the experiments of Wells & Wells (1959) showed that blinded Octopus vulgar is matured precociously. An effect of short day length in stimulating the optic glands of Sepia has been found by Defretin & Richard (1967) and Richard (1967) but this is not clearly the case for Octopus (Buckley, 1977). Octopuses kept in aquarium conditions for lengthy periods are said to have larger relative gonad sizes than those fresh from the sea (Wells & Wells, 1975). One of the factors associated with aquarium conditions is often a degree of starvation, and this circumstance alone is held to be a factor in inducing precocious sexual maturation in Eledone (Mangold & Boucher-Rodoni, 1973).In the course of recent studies on the growth and reproduction of Eledone cirrhosa from the North Sea (Boyle & Knobloch, 1982,1983,1984) animals which had remained in aquarium conditions for 5 days or over were separated from the analysis.

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Male reproductive maturity in the octopus,Eledone cirrhosa(Cephalopoda: Octopoda)

Cited by 15 publications

References 12 publications

Histological Analysis of the Reproductive System and Gonad Maturity of Octopus rubescens

Histological Analysis of the Reproductive System and Gonad Maturity of Octopus rubescens

Effects of temperature on energetics and the growth pattern of benthic octopuses

Reproductive maturity in fresh and aquarium-heldEledone cirrhosa(Cephalopoda: Octopoda)

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