Fig 1.
Map of the sampling sites and fishing grounds of the Andaman and Nicobar Islands, India.
Top left: Map of India with the Exclusive Economic Zone boundaries of Andaman and Nicobar Islands demarcated; Bottom left: Map of South Andaman with maroon triangles indicating sampled fish landing centers; Right: Map of the Andaman and Nicobar Islands showing fishing gear utilization across fishing grounds around the islands. South Andaman is demarcated by the maroon inset. The figure was produced using QGIS Development Team 2019. QGIS Geographic Information System. Open Source Geospatial Foundation Project (http://qgis.osgeo.org).
Table 1.
Summary of biological data for sharks landed.
Fig 2.
Total length (in cm) of sharks landed across the different fishing gear used on the islands.
The white dot represents the median, the thick grey bar in the center represents the interquartile range, the thin gray line represents the data distribution except for the outliers, and the kernel represents the distribution of the data.
Fig 3.
Size frequency distribution for males and females for the six most commonly landed shark species.
(a) L. macrorhinus, (b) C. amblyrhynchos, (c) S. lewini, (d) C. albimarginatus, (e) C. brevipinna, and (f) P. randalli. The grey bars represent females and the white bars represent males. The arrows represent the smallest individual representing young of year with the presence of an umbilical scar ‘U’, ‘F’ the smallest gravid females recorded, and ‘M’ the smallest recorded mature males.
Fig 4.
The seasonal size distribution of male and females for the most commonly landed shark species.
(a) L. macrorhinus, (b) C. amblyrhynchos, (c) S. lewini. The seasons are north-east monsoon (NE) (October–January), inter-monsoon or dry season (DS) (February–May) and south-west monsoon (SW) (June–September). The grey bars represent females and the white bars represent males.
Fig 5.
Percentage of mature males with total length (TL) for sharks at 50% maturity for the five most commonly landed shark species.
(a) L. macrorhinus, (b) C. amblyrhynchos, (c) S. lewini, (d) C. albimarginatus), and (e) C. brevipinna.
Fig 6.
Length and weight relationships between total body mass (kg) and total length (cm) for the six most commonly landed shark species.
(a) L. macrorhinus, (b) C. amblyrhynchos, (c) S. lewini, (d) C. albimarginatus, (e) C. brevipinna, and (f) P. randalli. The red marks represent females and the blue marks represent males.
Fig 7.
The seasonal size distribution of male and females for the most commonly landed shark species.
(a) C. albimarginatus, (b) C. brevipinna, and (c) P. randalli. The seasons are north-east monsoon (NE) (October–January), inter-monsoon or dry season (DS) (February–May) and south-west monsoon (SW) (June–September). The grey bars represent females and the white bars represent males.
Table 2.
Summary of biological data for rays landed.