Statolith growth of juvenile oval squid<i>Sepioteuthis</i><i>lessoniana</i>(Cephalopoda: Loliginidae) with special reference to ambient thermal condition

Ikeda, Yuzuru; Kobayashi, Masato

doi:10.1080/17451000903334710

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…This squid is usually targeted by artisanal fisheries (by hand jigging) and seasonal recreational angling, as well as being a by-catch of neritic trawl fisheries. This species was suggested to be a suitable model animal for studying influences of environmental changes on life-history traits of cephalopods due to its widespread distribution in neritic waters and its ability to be successfully maintained in aquaria (Forsythe et al , 2001; Pecl, 2001; Jackson & Moltschaniwskyj, 2002; Ikeda & Kobayashi, 2010).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan

2017

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The bigfin reef squid Sepioteuthis lessoniana is a neritic species widely distributed in coastal waters of the Indo-Pacific region and is of interest to fisheries for its high commercial value. Squid samples were collected from Keelung (KL) and Penghu (PH), around northern Taiwan from October 2012 to September 2013. A total of 949 squid were examined, and 620 squid were aged using statoliths. The age range of the squid in KL (55–183 days) was similar to that in PH (77–186 days). The squid hatched almost year-round, except in January and December in KL. Two seasonal cohorts were identified: a spring cohort (hatched in March to May) and an autumn cohort (July to October). Concentrations of nine trace elements in statoliths were analysed using solution-based inductively coupled plasma mass spectrometry (ICP-MS). Significant differences in Fe/Ca, Cu/Ca and Sr/Ca were found between the two locations, while significant differences in concentration ratios of Sr/Ca and Ba/Ca were noted between the two seasonal cohorts. Results of a principal component analysis and cluster analysis varied in life-history traits between the two geographic stocks and in elemental concentrations between the two seasonal cohorts. Squid in KL and PH might undertake different migration routes, while seasonal variability in oceanographic conditions was apparent in the two locations.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan

2017

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“…Age estimation in cephalopods is essentially based upon direct methods (Semmens et al 2004 ) and analysis of increments in internal structures (e.g. : Choe 1963 ; Bettencourt et al 1996 ; Perez et al 1996 ; Le Goff et al 1998 ; Jackson and Moltschaniwskyj 1999 ; Bettencourt and Guerra 2000 ; Arkhipkin 2005 ; Hall et al 2007 ; Ikeda and Kobayashi 2010 ; Hermosilla et al 2010 ; Canali et al 2011a , b ; Lei et al 2012 ; Arkhipkin and Shcherbich 2012 ; Raya et al 2013 ). Further research is recommended to estimate age in cephalopods in vivo.…”

Section: Care and Welfare Of Cephalopods: An Introductionmentioning

confidence: 99%

Cephalopods in neuroscience: regulations, research and the 3Rs

et al. 2014

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Cephalopods have been utilised in neuroscience research for more than 100 years particularly because of their phenotypic plasticity, complex and centralised nervous system, tractability for studies of learning and cellular mechanisms of memory (e.g. long-term potentiation) and anatomical features facilitating physiological studies (e.g. squid giant axon and synapse). On 1 January 2013, research using any of the about 700 extant species of “live cephalopods” became regulated within the European Union by Directive 2010/63/EU on the “Protection of Animals used for Scientific Purposes”, giving cephalopods the same EU legal protection as previously afforded only to vertebrates. The Directive has a number of implications, particularly for neuroscience research. These include: (1) projects will need justification, authorisation from local competent authorities, and be subject to review including a harm-benefit assessment and adherence to the 3Rs principles (Replacement, Refinement and Reduction). (2) To support project evaluation and compliance with the new EU law, guidelines specific to cephalopods will need to be developed, covering capture, transport, handling, housing, care, maintenance, health monitoring, humane anaesthesia, analgesia and euthanasia. (3) Objective criteria need to be developed to identify signs of pain, suffering, distress and lasting harm particularly in the context of their induction by an experimental procedure. Despite diversity of views existing on some of these topics, this paper reviews the above topics and describes the approaches being taken by the cephalopod research community (represented by the authorship) to produce “guidelines” and the potential contribution of neuroscience research to cephalopod welfare.

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“…This method has been systematically applied to squids (Arkhipkin & Laptikhovsky 1994, Jackson 1994, Rocha & Guerra 1999, Arkhipkin 2005, Ikeda & Kobayashi 2010 and to cuttlefish (Raya et al 1994, Bettencourt & Guerra 2001, Challier et al 2002. Unfortunately, statolith analysis is not useful here as octopus species, including Octopus vulgaris, lack growth rings in this structure (Young 1960, Lombarte et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluating age in Octopus vulgaris: estimation, validation and seasonal differences

Canali¹,

Ponte²,

Belcari³

et al. 2011

Mar. Ecol. Prog. Ser.

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Several internal structures have been used to estimate age in the cephalopod Octopus vulgaris, but with limited accuracy. We estimated age by investigating growth increments (rings) in the upper beaks of octopus collected between 2003 and 2010 in the Bay of Naples, Italy (Mediterranean Sea). To validate the daily periodicity of ring deposition, 'thermal shock marking' was for the first time applied to live octopuses fished between 2009 and 2010; this method produced a mark on the beak corresponding to the day of thermal shock, enabling us to elucidate the relationship between ring number and time elapsed (i.e. ~30 d). In addition, rings were counted in > 700 preserved specimens of O. vulgaris collected between 2003 and 2009, also in the Bay of Naples. The estimated age of of these octopuses ranged from about 70 to 370 d. Specimens with similar body weights had different numbers of rings, confirming the view that body size is a not a good index of age. Additionally, the relationship between body weight and number of rings was affected by sex and season, with the distance between rings clearly correlated to seasonal temperature oscillations. Our data suggest that different cohorts of octopus exist in the Bay of Naples and that temperature has a strong influence on growth. Overall the results demonstrate that growth increments in the upper beak of O. vulgaris provide a reliable method of aging that can be applied to assessing differences in the growth patterns in wild populations, and one that provides a record of environmental influences upon an individual. KEY WORDS: Octopus · Age · Thermal marking · Upper beak · Seasonal variability Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 441: 141-149, 2011 142 Age determination in cephalopods has been based on both indirect and direct methods. Indirect methods are not reliable with cephalopods (e.g. Semmens et al. 2004), mainly because growth in any cephalopod species appears to be affected by a series of both biotic and abiotic factors, leading to large individual variability (Mangold 1983, Forsythe & Van Heukelem 1987, Domain et al. 2000, Belcari et al. 2002. As a consequence, body size (weight and dorsal mantle length) is not a reliable indicator of age. For this reason indirect methods require validation by at least one direct method (Krstuloviç Šifner 2008).Among direct methods, one of the most useful means of age estimation in cephalopods is statolith increment analysis. This method has been systematically applied to squids (Arkhipkin & Laptikhovsky 1994, Jackson 1994, Rocha & Guerra 1999, Arkhipkin 2005, Ikeda & Kobayashi 2010 and to cuttlefish (Raya et al. 1994, Bettencourt & Guerra 2001, Challier et al. 2002. Unfortunately, statolith analysis is not useful here as octopus species, including Octopus vulgaris, lack growth rings in this structure (Young 1960, Lombarte et al. 2006). In the case of O. vulgaris, other internal structures have been analysed over the past 20 yr for direct age determination. ...

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Statolith growth of juvenile oval squidSepioteuthislessoniana(Cephalopoda: Loliginidae) with special reference to ambient thermal condition

Cited by 5 publications

References 18 publications

Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan

Spatiotemporal variations in life-history traits and statolith trace elements of Sepioteuthis lessoniana populations around northern Taiwan

Cephalopods in neuroscience: regulations, research and the 3Rs

Evaluating age in Octopus vulgaris: estimation, validation and seasonal differences

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