Determination of squid age using upper beak rostrum sections: technique improvement and comparison with the statolith

Liu, Bi Lin; Chen, Xin Jun; Chen, Yong; Hu, Guan Yu

doi:10.1007/s00227-015-2702-0

Cited by 23 publications

(13 citation statements)

References 26 publications

(31 reference statements)

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Section: Age Estimationsupporting

confidence: 74%

“…To the best knowledge of the authors, age estimation within the genus Ommastrephes had been performed only using statoliths (Yatsu et al, 1997;Yatsu, 2000;Yatsu and Mori, 2000), and more recently through the analysis of Rostral Sagittal Section (RSS) of the beaks of Pacific O. bartramii (Liu et al, 2015;Fang et al, 2016). In our study, similarly to what was observed by Liu et al (2015) in O. bartamii, growth increments observed in the RSS of O. caroli specimens were easily visible and counted. As regards the use of eye lenses for age estimation in cephalopods, it has been tried in Sepia officinalis (Linnaeus, 1758), Enteroctopus megalocyatus (Gould, 1852), Octopus maya (Voss and Solís, 1966), and more recently in Loligo vulgaris (Lamark, 1798) and Loligo forbesii (Steenstrup, 1856) (Clarke, 1993;Baqueiro-Cárdenas et al, 2011;Rodríguez-Domínguez et al, 2013;Agus et al, 2018).…”

Section: Age Estimationsupporting

confidence: 74%

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Molecular and Biological Analysis on Ommastrephes caroli Findings in the Central Western Mediterranean Sea (Sardinian Waters) Including First Age Investigation Using Eye Lenses and Beaks

et al. 2021

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Molecular identifications based on two mitochondrial markers (cytochrome c oxidase subunit I -COI- and 16S ribosomal RNA gene -16S-) have been implemented to confirm the morphological identification of eight specimens collected in the Central western Mediterranean. Molecular data show they belonged to a recently resurrected species of the genus Ommastrephes, i.e., O. caroli, known to be distributed in the Atlantic Ocean and Mediterranean Sea. Despite this, molecular analyses of COI sequences evidenced the presence of potential genetic differentiation between Mediterranean and Atlantic samples, highlighting the need for further studies, with more individuals to investigate the connectivity between individuals living in the two areas. Furthermore, morphological, biometric and reproductive features here reported, could be useful in evaluating possible distinctive biological features between the Mediterranean and Atlantic individuals. Female mature size was larger than the male. The relationships obtained between the beak measurements and body sizes (DML; TW) were better described by a power model. Asynchronous oocytes development with relatively small oocytes (0.05–1.10 mm) and a protracted intermittent spawning with active feeding were observed. This study also reported for the specie O. caroli the first data on the potential fecundity estimated (840061 oocytes), the oviducal load (90000 ripe oocytes) as well as the number of seminal receptacles and the size and morphology of the spermatangia found in the buccal mass of all mated females. Even if on a low sample size, beaks and eye lenses were used for the first time in O. caroli for age estimation. The statistically significant relationship found between increments counted in eye lenses and beaks highlighted the reliability of the lenses to estimate age in O. caroli, even if further studies will be needed for its validation. Assuming a daily increment for both structures, a mean life span of about 12–13 months was estimated for both sexes, which is consistent with the sexual maturity condition observed in all the samples and the semelparity known for cephalopods coleoids.

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Section: Age Estimationsupporting

confidence: 74%

Section: Age Estimationsupporting

confidence: 74%

Molecular and Biological Analysis on Ommastrephes caroli Findings in the Central Western Mediterranean Sea (Sardinian Waters) Including First Age Investigation Using Eye Lenses and Beaks

et al. 2021

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“…In contrast with adult beaks, transparency of this region in early developmental stages allowed us to observe the increments in the lateral surface of the rostrum, and preparation of RSS (following Perales-Raya et al 2010) is not necessary in para larvae. Increments used in adult RSS of octopuses (Perales-Raya et al 2014a,b) and squids (Liu et al 2015, Fang et al 2016, Hu et al 2016 are in fact the same increments as those in the rostrum surface of the paralarvae. The DIC-Nomarski technology also facilitated observation of different planes of the beak.…”

Section: Discussionmentioning

confidence: 94%

Comparative study of age estimation in wild and cultured Octopus vulgaris paralarvae: effect of temperature and diet

Perales-Raya¹,

Nande²,

Roura³

et al. 2018

Mar. Ecol. Prog. Ser.

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Sustainability within the fisheries of the commercially important European whelk Buccinum undatum has become a major concern because of over-exploitation and increased landings in many European coastal shelf seas due to the expansion of export markets to East Asian countries. Current management of B. undatum populations is difficult to achieve as several life history traits are problematic to accurately monitor. The current method of age determination for stock assessment has a low success rate and focuses on the use of putative annual rings on the surface of the organic operculum. Here, we validate an annual periodicity of growth ring formation in B. undatum statoliths that provides an alternative, reliable and accurate method for determining a whelk's age. Laboratory-reared juvenile B. undatum of known provenance and age deposited a hatching ring at the time of emergence from their egg capsule and a clearly defined growth ring during February of their first and second years. Stable oxygen isotope profiles from the shells of 2 adult whelks confirmed annual growth ring deposition by demonstrating seasonal cycles of δ 18O in the shell that matched the relative position and number of visible growth rings in the statolith. Validation of annually resolved statolith growth rings will, for the first time, provide fisheries scientists with a tool to determine the age structure of B. undatum populations and allow analytical stock assessments that will enable informed decisions for future management practices of whelk fisheries.

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“…In the Pacific, the age structure of O. bartramii has been described on the basis of counts of growth increments in various hard structures, which could also be applied in Atlantic Waters (Fang et al, 2016a;Liu et al, 2015). Other recent studies concern identification of beaks and statoliths recovered from predator stomachs, stock identification and migration patterns (Fang et al, 2014a, b;Fang and Chen, 2018;Fang et al, 2016c;Hu et al, 2018;Kato et al, 2016).…”

Section: Life Historymentioning

confidence: 99%

A review of recent studies on the life history and ecology of European cephalopods with emphasis on species with the greatest commercial fishery and culture potential

et al. 2021

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With the depletion of many commercial fish stocks and an increasing demand for marine protein for human consumption, cephalopods have become more important as a fishery resource. In EU waters, cephalopod stocks are not routinely assessed and exploitation of these species by large-scale fisheries is largely unregulated. For sustainable exploitation, adequate assessment and scientifically-supported management strategies are needed. However, there is still a lack of data on stock status and inadequate knowledge of the life history and ecology of these species. The present review examined more than 200 scientific articles, on life history and ecology of European cephalopods, published since 2013. It describes recent contributions to knowledge in the context of previously identified research priorities, along with recent advances towards sustainable fishing and aquaculture. It also identifies outstanding knowledge gaps. While some priority areas, such as the development of the species identification guides and evaluation of climate change impacts on cephalopods, have seen significant advances, other challenges remain for the future. These include monitoring of the life history traits and fishery status for the main commercially exploited species in the area, implementation of improved species identification methods during scientific surveys and fisheries monitoring, development of tools to identify stock units, and the study of the environmental and anthropogenic impacts on the stocks of cephalopods inhabiting European waters.

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Determination of squid age using upper beak rostrum sections: technique improvement and comparison with the statolith

Abstract: counting methods used are reliable. This study suggests that the RSS of the upper beak is an appropriate tool for estimating the age of D. gigas, O. bartramii and perhaps S. oualaniensis, although erosion of the rostral region may result in an underestimation of squid ages.

Cited by 23 publications

References 26 publications

Molecular and Biological Analysis on Ommastrephes caroli Findings in the Central Western Mediterranean Sea (Sardinian Waters) Including First Age Investigation Using Eye Lenses and Beaks

Molecular and Biological Analysis on Ommastrephes caroli Findings in the Central Western Mediterranean Sea (Sardinian Waters) Including First Age Investigation Using Eye Lenses and Beaks

Comparative study of age estimation in wild and cultured Octopus vulgaris paralarvae: effect of temperature and diet

A review of recent studies on the life history and ecology of European cephalopods with emphasis on species with the greatest commercial fishery and culture potential

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