Spatial Variations in the Shape and Chemistry of Sagittal Otoliths in Channa punctatus (Channidae) Populations of Ganga Basin, India

Singh, Munendra; Kashyap, Ankur; Ansari, Jamal Akhtar; Serajuddin, Mohammad

doi:10.1134/s1995082922030142

Cited by 1 publication

(2 citation statements)

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“…When the correlation matrix based on PCA was analyzed, it was found that PC1 contributed the highest (71.1%), followed by PC2 (15%), with signifcant loadings on PC2. Te truss distances with meaningful loadings on PC1 were (1-4), (1-5), (1-6), (1-7), (1-8), and (1-9), while for PC2, it was (7-11), (6)(7)(8)(9)(10)(11), (5)(6)(7)(8)(9)(10)(11), (8)(9)(10)(11), (2-7), and (2-9) and signifcant landmarks are being represented in Table 2 and Figure 2.…”

Section: Truss Morphometric Analysismentioning

confidence: 99%

“…It involves systematic measurement of distances (i.e., truss lines) between pairs of landmarks across the body, thus forming a sequential series of connected polygons termed a "trussed" box [10], which covers the entire shape of the fsh in the form of a uniform network. Tus, the probability of delineating the morphometric diferences among the different fsh stocks is increased [11]. Despite the ecological importance of freshwater and brackish water fshes, information on length-weight relationships and condition factors is often limited.…”

Section: Introductionmentioning

confidence: 99%

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Stock Evaluation of the Euryhaline Cichlid, Etroplus suratensis (Bloch, 1790), from Significant Brackish and Freshwater Regions of India

Haque,

Sawant,

Sundaray

et al. 2024

Journal of Applied Ichthyology

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The present study evaluates stocks of Etroplus suratensis concerning length-weight relationships (LWRs), condition factor (K), and truss analysis from different habitats, viz., West Bengal (freshwater hatchery), Gujarat (brackish water grow-out pond), and Odisha (Chilika lagoon) in India. All the stocks were collected using gill nets with various mesh sizes of 20–50 mm and cast nets with mesh size of 15 mm from February 2021 to September 2021. The total length (L), weight (W), and digital pictures were taken for LWRs and principle component analysis (PCA). The total length (L) and total weight (W) were measured to the nearest 0.1 cm and 0.01 gm, respectively, followed by regression analysis. The values of parameters “b” in the LWRs equation were estimated within the range of 2.50–3.82 and intercept “a” values (0.235–0.779) and “K” (1.07–3.37), respectively, for all different habitats and ecosystems with significant correlation values (R2 ≥ 0.85). In truss morphometric analysis, principal component 1 (PC1) contributed the highest (93.1%) and principal component 2 (PC2) contributed 4.6% to the size and shape variation amongst the stocks from different habitats and ecosystems. The scatter plot analysis and canonical variate analysis (CVA) have shown that the Gujarat and West Bengal stocks are closely placed and separated from the Chilika-Odisha stock. Similar variations were also observed in the ANOSIM boxplot analysis, where Chilika-Odisha stock scored higher than the other two stocks. Since data available regarding LWRs and truss morphometry studies of E. suratensis from different habitats are limited, the present study will provide a clear insight into the differentiation of E. suratensis stocks from different habitats in India. The overall findings of the present study could be utilized for the conservation and sustainable management of E. suratensis.

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