Exploration of statolith shape variation in jumbo flying squid, <i> Dosidicus gigas</i>, based on wavelet analysis and machine learning methods for stock classification

Fang, Zhou; Chen, Xinjun; Su, Hang; Staples, Kevin W.; Chen, Yong

doi:10.5343/bms.2017.1176

Cited by 7 publications

(5 citation statements)

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“…According to the discriminant function scatter plots, the external morphology could be effectively distinguished for purpleback flying squid statoliths from the three marine regions. Previous studies of differences in the external morphology of statoliths from fish species have indicated that both traditional morphological and Fourier analysis methods can be used for identification, but Fourier analysis is more reliable [14,15]. In the present study, there was little difference between the two methods, thereby demonstrating that both can be used for discriminating purpleback flying squid statoliths.…”

Section: Comparative Analysis Of Three Methods For Population Discrim...mentioning

confidence: 41%

“…The sampling distribution map is shown in Figure 1. The research indicates that there is no statistically significant difference in morphometrics between the left and right statoliths [15]. Therefore, after conducting basic biological measurements for the purpleback flying squid, the left statolith was extracted as the experimental sample.…”

Section: Methodsmentioning

confidence: 99%

“…Due to its calcified structure, the morphology of the statolith is not easily damaged [7], and it is highly specific [8]. Therefore, they are frequently employed in conjunction with beaks, internal shells, eye lenses, and other hard tissues for studying age and growth [9][10][11], species identification [12], population differentiation [13][14][15], and other purposes [7,8,16].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Differences and Contour Visualization of Statoliths in Different Geographic Populations of Purpleback Flying Squid (Sthenoteuthis oualaniensis)

Chu,

Liu,

et al. 2024

JMSE

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Statoliths are important hard tissues in cephalopods. Significant differences are found in the external morphology of statoliths in different groups or species. In this study, stepwise discriminant analysis was used to investigate the external morphological differences in purpleback flying squid statoliths in three different marine regions, comprising the East Indian Ocean (5° S–2° N, 82°–92° E), Central East Pacific Ocean (02°37′ S–0°59′ N, 99°44′ W–114°19′ W), and Northwest Indian Ocean (17°04′ N–17°18′ N, 61°05′ E–61°32′ E). The contours of statoliths were reconstructed visually by using Fourier analysis and the landmark method. The results obtained by stepwise discriminant analysis showed that the accuracy of identification was 84.4% for the traditional measurement method, 82.9% for the Fourier analysis method, and 87.3% for the landmark method. The contour visualization results showed that the purpleback flying squid statoliths were small in the Central East Pacific Ocean, and the curvature of the side region was the most obvious. The radian differentiation of statoliths was most gentle in the East Indian Ocean. In the Northwest Indian Ocean, the rostral region of statoliths was shorter and the dorsal region was smoother. The reconstruction results detected significant differences in the outer morphology of statoliths in different marine regions. The results obtained in this study show that all three methods are effective for identifying populations, but the landmark method is better than the traditional measurement method. The reconstruction of statolith contours using the Fourier transform and landmark methods provides an important scientific basis for conducting taxonomy, according to statolith morphology.

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Section: Comparative Analysis Of Three Methods For Population Discrim...mentioning

confidence: 41%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological Differences and Contour Visualization of Statoliths in Different Geographic Populations of Purpleback Flying Squid (Sthenoteuthis oualaniensis)

Chu,

Liu,

et al. 2024

JMSE

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“…It was concluded that a combination of statolith and beak was best for identification. Fang et al (2018a) is the only study to date to use WT methods for statolith shape analysis. The results of the study supported previous conclusions that the Humboldt squid Dosidicus gigas has two stocks separated by hemispheres.…”

Section: Statolithsmentioning

confidence: 99%

Application of Shape Analyses to Recording Structures of Marine Organisms for Stock Discrimination and Taxonomic Purposes

Lishchenko

Jones

2021

Front. Mar. Sci.

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Morphometric analysis of biogenic recording structures within marine organisms has applications in stock assessment, taxonomics, and ecomorphological studies, with shape variation markedly influenced by both genetics and the surrounding environment. Geometric morphometrics (GM) is an alternative approach to the “traditional” method of collecting linear measurements and applying multivariate statistical methods to these data. Landmark- and outline-based GM methods are suggested to have several advantages over the “traditional” method. Due to the increasing popularity of GM methods in the modern literature, this chapter first compares different morphometric techniques, and then reviews the methods applied to recording structures, with a focus on GM outline-based analyses. It is clear that outline methods have become a popular method of analysis for structures such as otoliths, particularly for the purpose of distinguishing between population components. However, for other structures such as beaks this technique is only in its early stages of application and is more difficult to apply but shows great promise for future studies. The advantages of using a holistic approach, incorporating several techniques including outline analysis for stock identification purposes is discussed.

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“…Consequently, the behaviour of I. coindetii is associated with significantly smaller statoliths than those of L. forbesii (Figure 1). Furthermore, bathymetry is assumed to affect behaviour and thereby influence statolith development and shape (Ching et al., 2022; Fang et al., 2018). Statolith growth, shape, and microstructure are also affected by temperature (Chemshirova et al., 2023; Moreno et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

Stock discrimination of two European squids (Illex coindetii, Loligo forbesii) by statolith shape analysis

Bobowski,

Power,

Burns

et al. 2024

Fisheries Management Eco

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We evaluated the feasibility of classifying ommastrephid and loliginid squid species by statolith shape analysis into fisheries management units or stocks. Statoliths of Illex coindetii (Verany, 1839) and Loligo forbesii (Steenstrup, 1856) were studied from multiple areas of the North East Atlantic and Northern Mediterranean Sea during 2021–2022. I. coindetii and L. forbesii individuals were categorized into multiple stocks across the areas studied. Stocks migrating between fishing areas as well as multiple stocks in the same area, as identified for L. forbesii in this study, need to be considered for sustainable fisheries management.

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Exploration of statolith shape variation in jumbo flying squid, Dosidicus gigas, based on wavelet analysis and machine learning methods for stock classification

Cited by 7 publications

References 0 publications

Morphological Differences and Contour Visualization of Statoliths in Different Geographic Populations of Purpleback Flying Squid (Sthenoteuthis oualaniensis)

Morphological Differences and Contour Visualization of Statoliths in Different Geographic Populations of Purpleback Flying Squid (Sthenoteuthis oualaniensis)

Application of Shape Analyses to Recording Structures of Marine Organisms for Stock Discrimination and Taxonomic Purposes

Stock discrimination of two European squids (Illex coindetii, Loligo forbesii) by statolith shape analysis

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