Characterisation of an individual of the giant form of the purpleback flying squid <i>Sthenoteuthis oualaniensis</i> (Cephalopoda: Ommastriphidae) in the Arabian Sea and its biological descriptors

Sajikumar, Kurichithara K.; Najmudeen, T M; Ragesh, N; Jeena, N. S.; Rahuman, Summaya; Sunil, K. T. S.; Sasikumar, Geetha; Mohamed, K S

doi:10.1080/13235818.2021.2003513

Cited by 4 publications

(5 citation statements)

References 33 publications

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“…1h). This female from the giant morphotype was recently described by the authors (Sajikumar et al 2021).…”

Section: Comparison Of the Morphological Formsmentioning

confidence: 65%

“…The abundance of S. oualaniensis in the Arabian Sea is well documented (Zuyev et al 2002), and their high economic development value in the Northwest Indian Ocean has been pointed out (Lu et al 2022). India has launched an aspiring project to explore these resources from the southeastern , Zuyev et al 2002Sajikumar et al 2021 Arabian Sea (Mohamed et al 2018). PBFS forms a target in commercial fishery in China (Lu et al 2022) and is yet to be a part of the major cephalopod fishery in India.…”

Section: Introductionmentioning

confidence: 99%

“…Snyder (1998) added further information on the giant form of the species, while Chembian (2013) extended this to the medium and dwarf forms. An integrative taxonomic approach was adopted to characterize the giant form (Sajikumar et al 2021) and the medium form (Ragesh 2021). Nevertheless, a detailed genetic study that can shed light on the status of the major morphotypes remained unexplored.…”

Section: Introductionmentioning

confidence: 99%

“…An integrative taxonomic approach was adopted to characterize the giant form (Sajikumar et al. 2021) and the medium form (Ragesh 2021). Nevertheless, a detailed genetic study that can shed light on the status of the major morphotypes remained unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean

et al. 2023

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Sthenoteuthis oualaniensis is known for its complex population structure with three major transoceanic forms (viz. middle‐sized, dwarf, and giant forms) whose taxonomic status has been disputed for decades. This integrated taxonomic study examines these prevenient morphotypes gathered on cruises in the Indian Ocean to ascertain their status in the evolutionary history of the species. Molecular analyses employing mitochondrial (COI, ND2) and nuclear (H3) markers revealed four genetically distinct and novel lineages of the species in the Indian Ocean, representing three morphotypes from the Arabian Sea and one from the Southern Indian Ocean. The mitochondrial‐based phylograms revealed two distinct clades in the species: “dwarf forms + giant form” and “middle‐sized forms,” which further branch into geographically structured evolutionary units. Species delimitation analyses recovered five distinct clades, namely, the Arabian Sea giant and dwarf forms, Equatorial, Eastern Typical, and Other Middle‐sized forms, representing the consensus molecular operational taxonomic units. H3 being heterozygous could not resolve the phylogeny. Haplotype network and AMOVA analysis of mtDNA genes indicated explicit phylogeographic structuring of haplotypes, whereas these outputs and PCA results were incongruent with the morphological grouping. Phenetic features distinguishing the morphotypes were sometimes plastic and mismatched with the genotypes. The giant form was genetically close to the dwarf forms, contradicting the earlier notion that it descended from the middle‐sized form. It may be assumed that the dwarf form evolved following sympatric speciation and adaptation to warm equatorial waters, while the focal features of the Western Arabian Sea guide toward allopatric speciation of the giant form.

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“…1h). This female from the giant morphotype was recently described by the authors (Sajikumar et al 2021).…”

Section: Comparison Of the Morphological Formsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean

et al. 2023

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“…In addition, squid in the western waters of the Philippines have an estimated life span of 3-9 months (95-275 days) [23]. However, the life span of the giant form of this species that inhabits the northwestern Indian Ocean and Arabian Sea is 4-9 months (120-270 days) [4] and 7 months (203 days), respectively [64] (Table 2). The age structure in our results was approximately half a year, belonging to the dwarf form.…”

Section: Age Structure and Hatching Groupmentioning

confidence: 99%

Beak Microstructure Estimates of the Age, Growth, and Population Structure of Purpleback Flying Squid (Sthenoteuthis oualaniensis) in the Xisha Islands Waters of the South China Sea

Chen

Liu

et al. 2022

Fishes

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This study aimed to explore the feasibility of using an upper beak microstructure to estimate the age of purpleback flying squid (Sthenoteuthis oualaniensis). From these microstructures, the age and growth of squid caught from January to March and May to August in 2018, 2019, and 2020 in the waters surrounding the Xisha Islands in the South China Sea were determined. We found three typical growth zones (the hood region, crest region, and axis), abnormal increments (checks), and erosion in the beak examination. The average dorsal mantle length (ML) of males and females was 112.13 (±15.23 mm) and 119.67 mm (±24.50 mm), respectively, and no squid were older than 10 months. The peak hatching dates, according to back calculations, were from October to January of the next year. All sampled squid belonged to the autumn/winter cohort. Significant sex differences were found in the relationship between ML and age in squid with similar growth patterns. Exponential models best described the relationships of ML with age and body weight (BW) for both sexes. However, a linear model best described the relationship between age and upper rostrum length (URL). The maximum absolute daily growth rates (AGR) of BW were reached during days 240–270 for both sexes. The maximum AGRs in ML were reached during days 180–210 and 240–270 for males and females, respectively. The period of 120–150 days (4–5 months) was considered the sub-adult stage of S. oualaniensis in the Xisha Islands waters of the South China Sea. This study confirmed that the beak microstructure provides good age estimates for purpleback flying squid (S. oualaniensis).

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A vignette of mitogenome and evolutionary status of the giant form of Sthenoteuthis oualaniensis (Lesson, 1830) endemic to the northwestern Arabian Sea

et al. 2023

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Characterisation of an individual of the giant form of the purpleback flying squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastriphidae) in the Arabian Sea and its biological descriptors

Cited by 4 publications

References 33 publications

Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean

Insights into the divergent evolution of the oceanic squid Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae) from the Indian Ocean

Beak Microstructure Estimates of the Age, Growth, and Population Structure of Purpleback Flying Squid (Sthenoteuthis oualaniensis) in the Xisha Islands Waters of the South China Sea

A vignette of mitogenome and evolutionary status of the giant form of Sthenoteuthis oualaniensis (Lesson, 1830) endemic to the northwestern Arabian Sea

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