Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 598:247-259 (2018) - DOI: https://doi.org/10.3354/meps12218 Comparative study of age estimation in wild and cultured Octopus vulgaris paralarvae: effect of temperature and diet C. Perales-Raya1,*, M. Nande2, A. Roura3, A. Bartolomé1, C. Gestal3, J. J. Otero2, P. García-Fernández3, E. Almansa1 1Instituto Español de Oceanografía, Centro Oceanográfico de Canarias, Santa Cruz de Tenerife 38180, Spain 2Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, Vigo 362390, Spain 3Instituto de Investigaciones Marinas Consejo Superior de Investigaciones Científicas, Vigo 36208, Spain *Corresponding author: catalina.perales@ca.ieo.es *New email address since May 14, 2019: catalina.perales@ieo.es Advance View was available online September 5, 2017; subsequently updated September 12, 2017 ABSTRACT: The common octopus Octopus vulgaris is a highly valuable species worldwide, but to understand its population dynamics and requirements under culture conditions, it is crucial to improve our knowledge about its planktonic stages. Previous studies validating daily beak growth increments in these stages allowed age estimation and comparison of wild and cultured paralarvae. We aimed to improve age estimations in captivity, addressing the effect of temperature and diet, to obtain an accurate estimation of age in wild specimens collected from the coast to the open ocean off NW Spain and Morocco. We analysed the beak growth increments of reared paralarvae at 14 and 21°C with 2 different crustacean prey taxa (Artemia and spider crab Maja brachydactyla zoeae) over 30 d. Daily increment deposition at 21°C was confirmed, whereas <1 increment d-1 was recorded at 14°C. The width of the reading area grew accordingly with age; therefore, this beak region may be suitable for age estimation. A general linear model (GLM) analysis showed that temperature and the interaction of age × temperature significantly influenced increment deposition, whereas diet did not. The number of growth rings recorded in wild paralarvae beaks ranged from 0-8 on the coast, 7-11 on the continental shelf and 2-28 in the open ocean. Corrected age estimates of wild paralarvae were obtained with the GLM using the mean temperatures recorded in the wild, supporting the hypothesis that O. vulgaris leave the coastal area and develop in the open ocean transported by upwelling filaments. KEY WORDS: Octopus vulgaris · Cephalopod · Paralarvae · Early life · Ageing · Beaks · Microstructure · Prey · Growth Full text in pdf format PreviousNextCite this article as: Perales-Raya C, Nande M, Roura A, Bartolomé A and others (2018) Comparative study of age estimation in wild and cultured Octopus vulgaris paralarvae: effect of temperature and diet. Mar Ecol Prog Ser 598:247-259. https://doi.org/10.3354/meps12218 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 598. Online publication date: June 28, 2018 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2018 Inter-Research.
Highlights
The common octopus Octopus vulgaris Cuvier, 1797 (Cephalopoda, Octopodidae) is a globally important fisheries species with a high economic value (Xavier et al 2015)
Paralarvae reared at 21°C showed higher weight in the zoeae-fed group than in the Artemia group (Fig. 4a); these differences were not observed in the width of the reading area (WRA) of the beak (Fig. 4b). These results indicated that the WRA, and by extension the beak, might grow independently of the rest of the body and feeding
The anterior pigmented region in paralarvae beaks has been previously used for age estimation in early stages of Octopus vulgaris (Perales-Raya et al 2014b, Franco-Santos et al 2016, Garrido et al 2016a), and Franco-Santos & Vidal (2014) provided a morphological description of the beaks of paralarvae of several squid species, but the relationship between beak parts has not been addressed before
Summary
The common octopus Octopus vulgaris Cuvier, 1797 (Cephalopoda, Octopodidae) is a globally important fisheries species with a high economic value (Xavier et al 2015). O. vulgaris has great potential for aquaculture diversification since it meets some of the requirements for commercial aquaculture, such as fast growth (Mangold & Boletzky 1973, Semmens et al 2004), a short life cycle (Boyle & Rodhouse 2005), high food conversion rates (Mangold 1983), easy adaptation to captivity (Iglesias & Fuentes 2014), as well as high demand and market value (Vaz-Pires et al 2004, Vidal et al 2014). It is a valuable experimental animal for biomedical and behavioural
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